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codegen.c

/* src/vm/jit/powerpc64/codegen.c - machine code generator for 64-bit PowerPC

   Copyright (C) 1996-2005, 2006, 2007, 2008
   CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO

   This file is part of CACAO.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.

*/


#include "config.h"

#include <assert.h>
#include <stdint.h>
#include <stdio.h>
#include <signal.h>

#include "vm/types.h"

#include "md-abi.h"

#include "vm/jit/powerpc64/arch.h"
#include "vm/jit/powerpc64/codegen.h"

#include "mm/memory.h"

#include "native/localref.h"
#include "native/native.h"

#include "threads/lock-common.h"

#include "vm/builtin.h"
#include "vm/exceptions.h"
#include "vm/global.h"
#include "vm/stringlocal.h"
#include "vm/vm.h"

#include "vm/jit/abi.h"
#include "vm/jit/abi-asm.h"
#include "vm/jit/asmpart.h"
#include "vm/jit/codegen-common.h"
#include "vm/jit/dseg.h"
#include "vm/jit/emit-common.h"
#include "vm/jit/jit.h"
#include "vm/jit/linenumbertable.h"
#include "vm/jit/parse.h"
#include "vm/jit/patcher-common.h"
#include "vm/jit/reg.h"
#include "vm/jit/replace.h"
#include "vm/jit/stacktrace.h"
#include "vm/jit/trap.h"

#include "vmcore/loader.h"
#include "vmcore/options.h"

#if defined(ENABLE_LSRA)
# include "vm/jit/allocator/lsra.h"
#endif


/* codegen_emit ****************************************************************

   Generates machine code.

*******************************************************************************/

bool codegen_emit(jitdata *jd)
{
      methodinfo         *m;
      codeinfo           *code;
      codegendata        *cd;
      registerdata       *rd;
      s4                  len, s1, s2, s3, d, disp;
      ptrint              a;
      varinfo            *var;
      basicblock         *bptr;
      instruction        *iptr;
      u2                  currentline;
      methodinfo         *lm;             /* local methodinfo for ICMD_INVOKE*  */
      unresolved_method  *um;
      builtintable_entry *bte;
      methoddesc         *md;
      s4                  fieldtype;
      s4                  varindex;
      unresolved_field   *uf;
      fieldinfo          *fi;

      /* get required compiler data */

      m    = jd->m;
      code = jd->code;
      cd   = jd->cd;
      rd   = jd->rd;

      /* prevent compiler warnings */

      d   = 0;
      lm  = NULL;
      um  = NULL;
      bte = NULL;
      uf  = NULL;

      {
      s4 i, p, t, l;
      s4 savedregs_num;

      savedregs_num = 0;

      /* space to save used callee saved registers */

      savedregs_num += (INT_SAV_CNT - rd->savintreguse);
      savedregs_num += (FLT_SAV_CNT - rd->savfltreguse);

      cd->stackframesize = rd->memuse + savedregs_num;

#if defined(ENABLE_THREADS)
      /* space to save argument of monitor_enter and Return Values to survive */
    /* monitor_exit. The stack position for the argument can not be shared  */
      /* with place to save the return register on PPC64, since both values     */
      /* reside in R3 */
      if (checksync && code_is_synchronized(code)) {
            /* reserve 2 slots for long/double return values for monitorexit */
            cd->stackframesize += 2;
      }

#endif

      /* create method header */

      /* align stack to 16-bytes */

/* FIXME */
/*    if (!m->isleafmethod || opt_verbosecall) */
/*          stackframesize = (stackframesize + 3) & ~3;
*/
/*    else if (m->isleafmethod && (stackframesize == LA_WORD_SIZE)) */
/*          stackframesize = 0; */

      (void) dseg_add_unique_address(cd, code);                      /* CodeinfoPointer */
      (void) dseg_add_unique_s4(cd, cd->stackframesize * 8);             /* FrameSize       */

      code->synchronizedoffset = rd->memuse * 8;

      /* REMOVEME: We still need it for exception handling in assembler. */

      if (code_is_leafmethod(code))
            (void) dseg_add_unique_s4(cd, 1);
      else
            (void) dseg_add_unique_s4(cd, 0);

      (void) dseg_add_unique_s4(cd, INT_SAV_CNT - rd->savintreguse); /* IntSave         */
      (void) dseg_add_unique_s4(cd, FLT_SAV_CNT - rd->savfltreguse); /* FltSave         */

      /* create stack frame (if necessary) */

      if (!code_is_leafmethod(code)) {
            M_MFLR(REG_ZERO);
            M_AST(REG_ZERO, REG_SP, LA_LR_OFFSET);
      }

      if (cd->stackframesize)
            M_STDU(REG_SP, REG_SP, -cd->stackframesize * 8);

      /* save return address and used callee saved registers */

      p = cd->stackframesize;
      for (i = INT_SAV_CNT - 1; i >= rd->savintreguse; i--) {
            p--; M_LST(rd->savintregs[i], REG_SP, p * 8);
      }
      for (i = FLT_SAV_CNT - 1; i >= rd->savfltreguse; i--) {
            p --; M_DST(rd->savfltregs[i], REG_SP, p * 8);
      }

      /* take arguments out of register or stack frame */

      md = m->parseddesc;

      for (p = 0, l = 0; p < md->paramcount; p++) {
            t = md->paramtypes[p].type;
            varindex = jd->local_map[l*5 + t];
            l++;
            if (IS_2_WORD_TYPE(t))    /* increment local counter for 2 word types */
                  l++;
            if (varindex == UNUSED)
                  continue;

            var = VAR(varindex);
            s1  = md->params[p].regoff;

            if (IS_INT_LNG_TYPE(t)) {
                  if (!md->params[p].inmemory) {
                        if (!IS_INMEMORY(var->flags))
                              M_INTMOVE(s1, var->vv.regoff);
                        else
                              M_LST(s1, REG_SP, var->vv.regoff);
                  }
                  else {
                        if (!IS_INMEMORY(var->flags))
                              M_LLD(var->vv.regoff, REG_SP, cd->stackframesize * 8 + s1);
                        else
                              var->vv.regoff = cd->stackframesize * 8 + s1;
                  }
            }
            else {
                  if (!md->params[p].inmemory) {
                        if (!IS_INMEMORY(var->flags))
                              M_FLTMOVE(s1, var->vv.regoff);
                        else
                              M_DST(s1, REG_SP, var->vv.regoff);
                  }
                  else {
                        if (!(var->flags & INMEMORY)) {
                              if (IS_2_WORD_TYPE(t))
                                    M_DLD(var->vv.regoff, REG_SP, cd->stackframesize * 8 + s1);
                              else
                                    M_DLD(var->vv.regoff, REG_SP, cd->stackframesize * 8 + s1);
                        }
                        else
                              var->vv.regoff = cd->stackframesize * 8 + s1;
                  }
            }
      }

      /* save monitorenter argument */

#if defined(ENABLE_THREADS)

      if (checksync && code_is_synchronized(code)) {

            /* stackoffset for argument used for LOCK_monitor_exit */
            s1 = rd->memuse;

#if !defined (NDEBUG)
            if (JITDATA_HAS_FLAG_VERBOSECALL(jd)) {
                  M_AADD_IMM(REG_SP, -((LA_SIZE_IN_POINTERS + PA_SIZE_IN_POINTERS + ARG_CNT) * 8), REG_SP);

                  for (p = 0; p < INT_ARG_CNT; p++)
                        M_LST(abi_registers_integer_argument[p], REG_SP, LA_SIZE + PA_SIZE + p * 8);

                  for (p = 0; p < FLT_ARG_CNT; p++)
                        M_DST(abi_registers_float_argument[p], REG_SP, LA_SIZE + PA_SIZE + (INT_ARG_CNT + p) * 8);

                  /* used for LOCK_monitor_exit, adopt size because we created another stackframe */
                  s1 += (LA_SIZE_IN_POINTERS + PA_SIZE_IN_POINTERS + ARG_CNT);
            }
#endif

            p = dseg_add_functionptr(cd, LOCK_monitor_enter);
            M_ALD(REG_ITMP3, REG_PV, p);
            M_ALD(REG_ITMP3, REG_ITMP3, 0); /* TOC */
            M_MTCTR(REG_ITMP3);

            /* get or test the lock object */

            if (m->flags & ACC_STATIC) {
                  p = dseg_add_address(cd, &m->clazz->object.header);
                  M_ALD(REG_A0, REG_PV, p);
            }
            else {
                  M_TST(REG_A0);
                  M_BNE(1);
                  M_ALD_INTERN(REG_ZERO, REG_ZERO, TRAP_NullPointerException);
            }

            M_AST(REG_A0, REG_SP, s1 * 8);                      /* rd->memuse * 8 */
            M_JSR;

#if !defined(NDEBUG)
            if (JITDATA_HAS_FLAG_VERBOSECALL(jd)) {
                  for (p = 0; p < INT_ARG_CNT; p++)
                        M_LLD(abi_registers_integer_argument[p], REG_SP, LA_SIZE + PA_SIZE + p * 8);

                  for (p = 0; p < FLT_ARG_CNT; p++)
                        M_DLD(abi_registers_float_argument[p], REG_SP, LA_SIZE + PA_SIZE + (INT_ARG_CNT + p) * 8);

                  M_AADD_IMM(REG_SP, (LA_SIZE_IN_POINTERS + PA_SIZE_IN_POINTERS + ARG_CNT) * 8, REG_SP);
            }
#endif
      }
#endif

      /* call trace function */
#if !defined (NDEBUG)
      if (JITDATA_HAS_FLAG_VERBOSECALL(jd))
            emit_verbosecall_enter(jd);
#endif

      }

      /* end of header generation */

      /* create replacement points */
       
      REPLACEMENT_POINTS_INIT(cd, jd);

      /* walk through all basic blocks */

      for (bptr = jd->basicblocks; bptr != NULL; bptr = bptr->next) {

            bptr->mpc = (s4) (cd->mcodeptr - cd->mcodebase);

            if (bptr->flags >= BBREACHED) {

            /* branch resolving */
            codegen_resolve_branchrefs(cd, bptr);

            /* handle replacement points */

            REPLACEMENT_POINT_BLOCK_START(cd, bptr);

            /* copy interface registers to their destination */

            len = bptr->indepth;
            MCODECHECK(128+len);

#if defined(ENABLE_LSRA)
            if (opt_lsra) {
                  while (len) {
                        len--;
                        var = VAR(bptr->invars[len]);
                        if ((len == bptr->indepth-1) && (bptr->type == BBTYPE_EXH)) {
                              /* d = reg_of_var(m, var, REG_ITMP1); */
                              if (!(var->flags & INMEMORY))
                                    d = var->vv.regoff;
                              else
                                    d = REG_ITMP1;
                              M_INTMOVE(REG_ITMP1, d);
                              emit_store(jd, NULL, var, d);
                        }
                  }
            } else {
#endif
            while (len) {
                  len--;
                  var = VAR(bptr->invars[len]);
                  if ((len == bptr->indepth-1) && (bptr->type == BBTYPE_EXH)) {
                        d = codegen_reg_of_var(0, var, REG_ITMP1);
                        M_INTMOVE(REG_ITMP1, d);
                        emit_store(jd, NULL, var, d);
                  } 
                  else {
                        assert((var->flags & INOUT));
                  }
            }

#if defined(ENABLE_LSRA)
            }
#endif
            /* walk through all instructions */
            
            len = bptr->icount;
            currentline = 0;
                  
            for (iptr = bptr->iinstr; len > 0; len--, iptr++) {
                  if (iptr->line != currentline) {
                        linenumbertable_list_entry_add(cd, iptr->line);
                        currentline = iptr->line;
                  }

                  MCODECHECK(128);   /* an instruction usually needs < 64 words      */

            switch (iptr->opc) {
            case ICMD_NOP:        /* ...  ==> ...                                 */
            case ICMD_POP:        /* ..., value  ==> ...                          */
            case ICMD_POP2:       /* ..., value, value  ==> ...                   */
                  break;

            case ICMD_INLINE_START:

                  REPLACEMENT_POINT_INLINE_START(cd, iptr);
                  break;

            case ICMD_INLINE_BODY:
       
                  REPLACEMENT_POINT_INLINE_BODY(cd, iptr);
                  linenumbertable_list_entry_add_inline_start(cd, iptr);
                  linenumbertable_list_entry_add(cd, iptr->line);
                  break;

            case ICMD_INLINE_END:

                  linenumbertable_list_entry_add_inline_end(cd, iptr);
                  linenumbertable_list_entry_add(cd, iptr->line);
                  break;

            case ICMD_CHECKNULL:  /* ..., objectref  ==> ..., objectref           */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  M_TST(s1);
                  M_BEQ(0);
                  emit_nullpointer_check(cd, iptr, s1);
                  break;

            /* constant operations ************************************************/

            case ICMD_ICONST:     /* ...  ==> ..., constant                       */

                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP1);
                  ICONST(d, iptr->sx.val.i);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_LCONST:     /* ...  ==> ..., constant                       */

                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP1);
                  LCONST(d, iptr->sx.val.l);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_FCONST:     /* ...  ==> ..., constant                       */

                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP1);
                  a = dseg_add_float(cd, iptr->sx.val.f);
                  M_FLD(d, REG_PV, a);
                  emit_store_dst(jd, iptr, d);
                  break;
                  
            case ICMD_DCONST:     /* ...  ==> ..., constant                       */

                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP1);
                  a = dseg_add_double(cd, iptr->sx.val.d);
                  M_DLD(d, REG_PV, a);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_ACONST:     /* ...  ==> ..., constant                       */

                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP1);

                  if (INSTRUCTION_IS_UNRESOLVED(iptr)) {
                        disp = dseg_add_unique_address(cd, iptr->sx.val.c.ref);
                        patcher_add_patch_ref(jd, PATCHER_resolve_classref_to_classinfo,
                                                      iptr->sx.val.c.ref,
                                                    disp);
                  } else      {
                        disp = dseg_add_address(cd, iptr->sx.val.anyptr);
                  }
                  M_ALD(d, REG_PV, disp);
                  emit_store_dst(jd, iptr, d);
                  break;


            /* load/store/copy/move operations ************************************/

            case ICMD_ILOAD:      /* ...  ==> ..., content of local variable      */
            case ICMD_ALOAD:      /* s1.localindex = local variable               */
            case ICMD_LLOAD:
            case ICMD_FLOAD:
            case ICMD_DLOAD:
            case ICMD_ISTORE:     /* ..., value  ==> ...                          */
            case ICMD_LSTORE:
            case ICMD_FSTORE:
            case ICMD_DSTORE:
            case ICMD_COPY:
            case ICMD_MOVE:

                  emit_copy(jd, iptr);
                  break;

            case ICMD_ASTORE:
                  if (!(iptr->flags.bits & INS_FLAG_RETADDR))
                        emit_copy(jd, iptr);
                  break;


            /* integer operations *************************************************/

            case ICMD_INEG:       /* ..., value  ==> ..., - value                 */
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1); 
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_NEG(s1, d);
                  M_EXTSW(d, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_LNEG:    
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1); 
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_NEG(s1, d);
                  emit_store_dst(jd, iptr, d);
                  break;


            case ICMD_I2L:        /* ..., value  ==> ..., value                   */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP1);
                  M_INTMOVE(s1, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_L2I:        /* ..., value  ==> ..., value                   */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_ISEXT(s1, d);   
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_INT2BYTE:   /* ..., value  ==> ..., value                   */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_BSEXT(s1, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_INT2CHAR:   /* ..., value  ==> ..., value                   */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_CZEXT(s1, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_INT2SHORT:  /* ..., value  ==> ..., value                   */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_SSEXT(s1, d);
                  emit_store_dst(jd, iptr, d);
                  break;


            case ICMD_IADD:       /* ..., val1, val2  ==> ..., val1 + val2        */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_IADD(s1, s2, d);
                  M_EXTSW(d,d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_IINC:
            case ICMD_IADDCONST:

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP1);
                  if ((iptr->sx.val.i >= -32768) && (iptr->sx.val.i <= 32767)) {
                        M_IADD_IMM(s1, iptr->sx.val.i, d);
                  } else {
                        ICONST(REG_ITMP2, iptr->sx.val.i);
                        M_IADD(s1, REG_ITMP2, d);
                  }
                  M_EXTSW(d,d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_LADD:       /* ..., val1, val2  ==> ..., val1 + val2        */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP3);
                  M_LADD(s1, s2, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_LADDCONST:  /* ..., value  ==> ..., value + constant        */
                                  /* sx.val.l = constant                          */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  /* XXX check me */
                  if ((iptr->sx.val.l >= -32768) && (iptr->sx.val.l <= 32767)) {
                        M_LADD_IMM(s1, iptr->sx.val.l, d);
                  } else {
                        LCONST(REG_ITMP2, iptr->sx.val.l);
                        M_LADD(s1, REG_ITMP2, d);
                  }
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_ISUB:       /* ..., val1, val2  ==> ..., val1 - val2        */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_SUB(s1, s2, d);
                  M_EXTSW(d, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_ISUBCONST:  /* ..., value  ==> ..., value + constant        */
                                  /* sx.val.i = constant                          */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  if ((iptr->sx.val.i >= -32767) && (iptr->sx.val.i <= 32768)) {
                        M_IADD_IMM(s1, -iptr->sx.val.i, d);
                  } else {
                        ICONST(REG_ITMP2, iptr->sx.val.i);
                        M_SUB(s1, REG_ITMP2, d);
                  }
                  M_EXTSW(d, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_LSUB:       /* ..., val1, val2  ==> ..., val1 - val2        */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP3);
                  M_SUB(s1, s2, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_LSUBCONST:  /* ..., value  ==> ..., value - constant        */
                                  /* sx.val.l = constant                          */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  /* XXX check me */
                  if ((iptr->sx.val.l >= -32767) && (iptr->sx.val.l <= 32767)) {
                        M_LADD_IMM(s1, -iptr->sx.val.l, d);
                  } else {
                        LCONST(REG_ITMP2, iptr->sx.val.l);
                        M_SUB(s1, REG_ITMP2, d);
                  }
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_IDIV:
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP3);
                  emit_arithmetic_check(cd, iptr, s2);

                  M_DIV(s1, s2, d);
                  M_EXTSW(d, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_LDIV:       /* ..., val1, val2  ==> ..., val1 / val2        */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP3);
                  emit_arithmetic_check(cd, iptr, s2);

                  M_DIV(s1, s2, d);
                  /* we need to test if divident was 0x8000000000000, bit OV is set in XER in this case */
                  /* we only need to check this if we did a LDIV, not for IDIV */
                  M_MFXER(REG_ITMP2);
                  M_ANDIS(REG_ITMP2, 0x4000, REG_ITMP2);    /* test OV */
                  M_BLE(1);
                  M_MOV(s1, d);                       /* java specs says result == dividend */
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_IREM:
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  emit_arithmetic_check(cd, iptr, s2);

                  M_DIV(s1, s2,  REG_ITMP3);    
                  M_MUL(REG_ITMP3, s2, REG_ITMP2);
                  M_SUB(s1, REG_ITMP2,  REG_ITMP3);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP1);

                  M_MOV(REG_ITMP3, d);
                  emit_store_dst(jd, iptr, d);
                  break;


            case ICMD_LREM:       /* ..., val1, val2  ==> ..., val1 % val2        */
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  emit_arithmetic_check(cd, iptr, s2);

                  M_DIV(s1, s2,  REG_ITMP3);    
                  /* we need to test if divident was 0x8000000000000, bit OV is set in XER in this case */
                  /* we only need to check this if we did a LDIV, not for IDIV */
                  M_MFXER(REG_ITMP2);
                  M_ANDIS(REG_ITMP2, 0x4000, REG_ITMP2);    /* test OV */
                  M_BLE(2); 
                  LCONST(REG_ITMP3, 0);               /* result == 0 in this case */
                  M_BR(2);
                  M_MUL(REG_ITMP3, s2, REG_ITMP2);
                  M_SUB(s1, REG_ITMP2,  REG_ITMP3);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP1);

                  M_MOV(REG_ITMP3, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            
            case ICMD_IMUL:       /* ..., val1, val2  ==> ..., val1 * val2        */
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_MUL(s1, s2, d);
                  M_EXTSW(d, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_LMUL:
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_MUL(s1, s2, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_IMULCONST:  /* ..., value  ==> ..., value * constant        */
                                  /* sx.val.i = constant                          */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  if ((iptr->sx.val.i >= -32768) && (iptr->sx.val.i <= 32767))
                        M_MUL_IMM(s1, iptr->sx.val.i, d);
                  else {
                        ICONST(REG_ITMP3, iptr->sx.val.i);
                        M_MUL(s1, REG_ITMP3, d);
                  }
                  M_EXTSW(d, d);
                  emit_store_dst(jd, iptr, d);
                  break;
            case ICMD_LMULCONST:
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  if ((iptr->sx.val.l >= -32767) && (iptr->sx.val.l <= 32767))
                        M_MUL_IMM(s1, iptr->sx.val.l, d);
                  else {
                        LCONST(REG_ITMP3, iptr->sx.val.l);
                        M_MUL(s1, REG_ITMP3, d);
                  }
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_IDIVPOW2:   /* ..., value  ==> ..., value << constant       */
                  
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP3);
                  M_SRA_IMM(s1, iptr->sx.val.i, d);
                  M_ADDZE(d, d);
                  M_EXTSW(d, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_ISHL:       /* ..., val1, val2  ==> ..., val1 << val2       */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_AND_IMM(s2, 0x1f, REG_ITMP3);
                  M_SLL(s1, REG_ITMP3, d);
                  M_EXTSW(d, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_ISHLCONST:  /* ..., value  ==> ..., value << constant       */
                                  /* sx.val.i = constant                             */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_SLL_IMM(s1, iptr->sx.val.i & 0x1f, d);
                  M_EXTSW(d,d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_ISHR:       /* ..., val1, val2  ==> ..., val1 >> val2       */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_AND_IMM(s2, 0x1f, REG_ITMP3);
                  M_SRA(s1, REG_ITMP3, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_ISHRCONST:  /* ..., value  ==> ..., value >> constant       */
                                  /* sx.val.i = constant                             */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_SRA_IMM(s1, iptr->sx.val.i & 0x1f, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_IUSHR:      /* ..., val1, val2  ==> ..., val1 >>> val2      */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_AND_IMM(s2, 0x1f, REG_ITMP2);
                  M_MOV(s1, REG_ITMP1);
                  M_CLR_HIGH(REG_ITMP1);
                  M_SRL(REG_ITMP1, REG_ITMP2, d);
                  M_EXTSW(d,d);     /* for the case it was shift 0 bits */
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_IUSHRCONST: /* ..., value  ==> ..., value >>> constant      */
                                  /* sx.val.i = constant                             */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  if (iptr->sx.val.i & 0x1f) {
                        M_MOV(s1, REG_ITMP1);
                        M_CLR_HIGH(REG_ITMP1);
                        M_SRA_IMM(REG_ITMP1, iptr->sx.val.i & 0x1f, d);
                  } else {
                        M_INTMOVE(s1, d);
                  }
                  emit_store_dst(jd, iptr, d);
                  break;
      
            case ICMD_LSHLCONST:
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_SLL_IMM(s1, iptr->sx.val.i & 0x3f, d);
                  emit_store_dst(jd, iptr, d);
                  break;
            case ICMD_LSHL:
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_AND_IMM(s2, 0x3f, REG_ITMP2);
                  M_SLL(s1, REG_ITMP2, d);
                  emit_store_dst(jd, iptr, d);
                  break;
            case ICMD_LSHRCONST:
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_SRA_IMM(s1, iptr->sx.val.i & 0x3f, d);
                  emit_store_dst(jd, iptr, d);
                  break;
            case ICMD_LSHR:
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_AND_IMM(s2, 0x3f, REG_ITMP2);
                  M_SRA(s1, REG_ITMP2, d);
                  emit_store_dst(jd, iptr, d);
                  break;
            case ICMD_LUSHRCONST:
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_SRL_IMM(s1, iptr->sx.val.i & 0x3f, d);
                  emit_store_dst(jd, iptr, d);
                  break;
            case ICMD_LUSHR:
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_AND_IMM(s2, 0x3f, REG_ITMP2);
                  M_SRL(s1, REG_ITMP2, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_IAND:       /* ..., val1, val2  ==> ..., val1 & val2        */
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP3);
                  M_AND(s1, s2, d);
/*                M_EXTSW(d, d);*/
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_LAND:
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP3);
                  M_AND(s1, s2, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_IANDCONST:  /* ..., value  ==> ..., value & constant        */
                                  /* sx.val.i = constant                          */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  if ((iptr->sx.val.i >= 0) && (iptr->sx.val.i <= 65535)) {
                        M_AND_IMM(s1, iptr->sx.val.i, d);
                        }
                  /*
                  else if (iptr->sx.val.i == 0xffffff) {
                        M_RLWINM(s1, 0, 8, 31, d);
                        }
                  */
                  else {
                        ICONST(REG_ITMP3, iptr->sx.val.i);
                        M_AND(s1, REG_ITMP3, d);
                  }
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_LANDCONST:  /* ..., value  ==> ..., value & constant        */
                                  /* sx.val.l = constant                          */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  if ((iptr->sx.val.l >= 0) && (iptr->sx.val.l <= 65535))
                        M_AND_IMM(s1, iptr->sx.val.l, d);
                  /*
                  else if (iptr->sx.val.l == 0xffffff) {
                        M_RLWINM(s1, 0, 8, 31, d);
                        }
                  */
                  else {
                        LCONST(REG_ITMP3, iptr->sx.val.l);
                        M_AND(s1, REG_ITMP3, d);
                  }
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_IREMPOW2:   /* ..., value  ==> ..., value % constant        */
                                  /* sx.val.i = constant                             */
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
#if 0
                  /* fast division, result in REG_ITMP3) */
                  M_SRA_IMM(s1, iptr->sx.val.i, REG_ITMP3);
                  M_ADDZE(REG_ITMP3, REG_ITMP3);

                  M_SUB(s1, REG_ITMP3, d);
                  M_EXTSW(d, d);
                  emit_store_dst(jd, iptr, d);
                  break;
#else
                  
                  M_MOV(s1, REG_ITMP2);
                  M_CMPI(s1, 0);
                  M_BGE(1 + 3*(iptr->sx.val.i >= 32768));
                  if (iptr->sx.val.i >= 32768) {
                        M_ADDIS(REG_ZERO, iptr->sx.val.i >> 16, REG_ITMP2);
                        M_EXTSW(REG_ITMP2, REG_ITMP2);
                        M_OR_IMM(REG_ITMP2, iptr->sx.val.i, REG_ITMP2);
                        M_IADD(s1, REG_ITMP2, REG_ITMP2);
                  } else {
                        M_IADD_IMM(s1, iptr->sx.val.i, REG_ITMP2);
                  }
                  {
                        int b=0, m = iptr->sx.val.i;
                        while (m >>= 1)
                              ++b;
                        M_RLWINM(REG_ITMP2, 0, 0, 30-b, REG_ITMP2);
                  }
                  M_SUB(s1, REG_ITMP2, d);
                  M_EXTSW(d, d);
                  emit_store_dst(jd, iptr, d);
                  break;
#endif

            case ICMD_IOR:        /* ..., val1, val2  ==> ..., val1 | val2        */
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP3);
                  M_OR(s1, s2, d);
/*                M_EXTSW(d,d);*/
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_LOR:

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP3);
                  M_OR(s1, s2, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_IORCONST:   /* ..., value  ==> ..., value | constant        */
                                  /* sx.val.i = constant                          */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  if ((iptr->sx.val.i >= 0) && (iptr->sx.val.i <= 65535))
                        M_OR_IMM(s1, iptr->sx.val.i, d);
                  else {
                        ICONST(REG_ITMP3, iptr->sx.val.i);
                        M_OR(s1, REG_ITMP3, d);
                  }
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_LORCONST:   /* ..., value  ==> ..., value | constant        */
                                  /* sx.val.l = constant                          */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  if ((iptr->sx.val.l >= 0) && (iptr->sx.val.l <= 65535))
                        M_OR_IMM(s1, iptr->sx.val.l, d);
                  else {
                        LCONST(REG_ITMP3, iptr->sx.val.l);
                        M_OR(s1, REG_ITMP3, d);
                  }
                  emit_store_dst(jd, iptr, d);
                  break;


            case ICMD_IXOR:       /* ..., val1, val2  ==> ..., val1 ^ val2        */
            case ICMD_LXOR:

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_XOR(s1, s2, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_IXORCONST:  /* ..., value  ==> ..., value ^ constant        */
                                  /* sx.val.i = constant                          */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  if ((iptr->sx.val.i >= 0) && (iptr->sx.val.i <= 65535))
                        M_XOR_IMM(s1, iptr->sx.val.i, d);
                  else {
                        ICONST(REG_ITMP3, iptr->sx.val.i);
                        M_XOR(s1, REG_ITMP3, d);
                  }
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_LXORCONST:  /* ..., value  ==> ..., value ^ constant        */
                                  /* sx.val.l = constant                          */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  if ((iptr->sx.val.l >= 0) && (iptr->sx.val.l <= 65535))
                        M_XOR_IMM(s1, iptr->sx.val.l, d);
                  else {
                        LCONST(REG_ITMP3, iptr->sx.val.l);
                        M_XOR(s1, REG_ITMP3, d);
                  }
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_LCMP:       /* ..., val1, val2  ==> ..., val1 cmp val2      */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP3);
                  /* XXX implement me!!! */
                  vm_abort("codegen: implement ICMD_LCMP!");
                  emit_store_dst(jd, iptr, d);
                  break;
                  break;


            /* floating operations ************************************************/

            case ICMD_FNEG:       /* ..., value  ==> ..., - value                 */

                  s1 = emit_load_s1(jd, iptr, REG_FTMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP3);
                  M_FMOVN(s1, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_DNEG:       /* ..., value  ==> ..., - value                 */

                  s1 = emit_load_s1(jd, iptr, REG_FTMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP3);
                  M_FMOVN(s1, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_FADD:       /* ..., val1, val2  ==> ..., val1 + val2        */

                  s1 = emit_load_s1(jd, iptr, REG_FTMP1);
                  s2 = emit_load_s2(jd, iptr, REG_FTMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP3);
                  M_FADD(s1, s2, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_DADD:       /* ..., val1, val2  ==> ..., val1 + val2        */

                  s1 = emit_load_s1(jd, iptr, REG_FTMP1);
                  s2 = emit_load_s2(jd, iptr, REG_FTMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP3);
                  M_DADD(s1, s2, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_FSUB:       /* ..., val1, val2  ==> ..., val1 - val2        */

                  s1 = emit_load_s1(jd, iptr, REG_FTMP1);
                  s2 = emit_load_s2(jd, iptr, REG_FTMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP3);
                  M_FSUB(s1, s2, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_DSUB:       /* ..., val1, val2  ==> ..., val1 - val2        */

                  s1 = emit_load_s1(jd, iptr, REG_FTMP1);
                  s2 = emit_load_s2(jd, iptr, REG_FTMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP3);
                  M_DSUB(s1, s2, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_FMUL:       /* ..., val1, val2  ==> ..., val1 * val2        */

                  s1 = emit_load_s1(jd, iptr, REG_FTMP1);
                  s2 = emit_load_s2(jd, iptr, REG_FTMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP3);
                  M_FMUL(s1, s2, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_DMUL:       /* ..., val1, val2  ==> ..., val1 * val2        */

                  s1 = emit_load_s1(jd, iptr, REG_FTMP1);
                  s2 = emit_load_s2(jd, iptr, REG_FTMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP3);
                  M_DMUL(s1, s2, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_FDIV:       /* ..., val1, val2  ==> ..., val1 / val2        */

                  s1 = emit_load_s1(jd, iptr, REG_FTMP1);
                  s2 = emit_load_s2(jd, iptr, REG_FTMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP3);
                  M_FDIV(s1, s2, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_DDIV:       /* ..., val1, val2  ==> ..., val1 / val2        */

                  s1 = emit_load_s1(jd, iptr, REG_FTMP1);
                  s2 = emit_load_s2(jd, iptr, REG_FTMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP3);
                  M_DDIV(s1, s2, d);
                  emit_store_dst(jd, iptr, d);
                  break;
            
            case ICMD_F2I:       /* ..., value  ==> ..., (int) value              */
            case ICMD_D2I:

                  s1 = emit_load_s1(jd, iptr, REG_FTMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  M_CLR(d);
                  disp = dseg_add_float(cd, 0.0);
                  M_FLD(REG_FTMP2, REG_PV, disp);
                  M_FCMPU(s1, REG_FTMP2);
                  M_BNAN(4);
                  disp = dseg_add_unique_s4(cd, 0);
                  M_CVTDL_C(s1, REG_FTMP1);
                  M_LDA(REG_ITMP1, REG_PV, disp);
                  M_STFIWX(REG_FTMP1, 0, REG_ITMP1);
                  M_ILD(d, REG_PV, disp);
                  emit_store_dst(jd, iptr, d);
                  break;
            
            case ICMD_F2D:       /* ..., value  ==> ..., (double) value           */

                  s1 = emit_load_s1(jd, iptr, REG_FTMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP3);
                  M_FLTMOVE(s1, d);
                  emit_store_dst(jd, iptr, d);
                  break;
                              
            case ICMD_D2F:       /* ..., value  ==> ..., (double) value           */

                  s1 = emit_load_s1(jd, iptr, REG_FTMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP3);
                  M_CVTDF(s1, d);
                  emit_store_dst(jd, iptr, d);
                  break;
            
            case ICMD_FCMPL:      /* ..., val1, val2  ==> ..., val1 fcmpg val2    */
            case ICMD_DCMPL:      /* == => 0, < => 1, > => -1                     */

                  s1 = emit_load_s1(jd, iptr, REG_FTMP1);
                  s2 = emit_load_s2(jd, iptr, REG_FTMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP1);
                  M_FCMPU(s2, s1);
                  M_IADD_IMM(REG_ZERO, -1, d);
                  M_BNAN(4);
                  M_BGT(3);
                  M_IADD_IMM(REG_ZERO, 0, d);
                  M_BGE(1);
                  M_IADD_IMM(REG_ZERO, 1, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_FCMPG:      /* ..., val1, val2  ==> ..., val1 fcmpl val2    */
            case ICMD_DCMPG:      /* == => 0, < => 1, > => -1                     */

                  s1 = emit_load_s1(jd, iptr, REG_FTMP1);
                  s2 = emit_load_s2(jd, iptr, REG_FTMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP1);
                  M_FCMPU(s1, s2);
                  M_IADD_IMM(REG_ZERO, 1, d);
                  M_BNAN(4);
                  M_BGT(3);
                  M_IADD_IMM(REG_ZERO, 0, d);
                  M_BGE(1);
                  M_IADD_IMM(REG_ZERO, -1, d);
                  emit_store_dst(jd, iptr, d);
                  break;

                  
            /* memory operations **************************************************/

            case ICMD_ARRAYLENGTH: /* ..., arrayref  ==> ..., length              */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  emit_nullpointer_check(cd, iptr, s1);
                  M_ILD(d, s1, OFFSET(java_array_t, size));
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_BALOAD:     /* ..., arrayref, index  ==> ..., value         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  M_IADD_IMM(s2, OFFSET(java_bytearray_t, data[0]), REG_ITMP2);
                  /* implicit null-pointer check */
                  M_LBZX(d, s1, REG_ITMP2);
                  M_BSEXT(d, d);
                  emit_store_dst(jd, iptr, d);
                  break;                  

            case ICMD_CALOAD:     /* ..., arrayref, index  ==> ..., value         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  M_SLL_IMM(s2, 1, REG_ITMP2);
                  M_IADD_IMM(REG_ITMP2, OFFSET(java_chararray_t, data[0]), REG_ITMP2);
                  /* implicit null-pointer check */
                  M_LHZX(d, s1, REG_ITMP2);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_SALOAD:     /* ..., arrayref, index  ==> ..., value         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  M_SLL_IMM(s2, 1, REG_ITMP2);
                  M_IADD_IMM(REG_ITMP2, OFFSET(java_shortarray_t, data[0]), REG_ITMP2);
                  /* implicit null-pointer check */
                  M_LHAX(d, s1, REG_ITMP2);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_IALOAD:     /* ..., arrayref, index  ==> ..., value         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  M_SLL_IMM(s2, 2, REG_ITMP2);
                  M_IADD_IMM(REG_ITMP2, OFFSET(java_intarray_t, data[0]), REG_ITMP2);
                  /* implicit null-pointer check */
                  M_LWAX(d, s1, REG_ITMP2);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_LALOAD:     /* ..., arrayref, index  ==> ..., value         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, PACK_REGS(REG_ITMP2, REG_ITMP1));
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  M_SLL_IMM(s2, 3, REG_ITMP2);
                  M_IADD(s1, REG_ITMP2, REG_ITMP2);
                  /* implicit null-pointer check */
                  M_LLD_INTERN(d, REG_ITMP2, OFFSET(java_longarray_t, data[0]));
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_FALOAD:     /* ..., arrayref, index  ==> ..., value         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP1);
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  M_SLL_IMM(s2, 2, REG_ITMP2);
                  M_IADD_IMM(REG_ITMP2, OFFSET(java_floatarray_t, data[0]), REG_ITMP2);
                  /* implicit null-pointer check */
                  M_LFSX(d, s1, REG_ITMP2);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_DALOAD:     /* ..., arrayref, index  ==> ..., value         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_FTMP1);
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  M_SLL_IMM(s2, 3, REG_ITMP2);
                  M_IADD_IMM(REG_ITMP2, OFFSET(java_doublearray_t, data[0]), REG_ITMP2);
                  /* implicit null-pointer check */
                  M_LFDX(d, s1, REG_ITMP2);
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_AALOAD:     /* ..., arrayref, index  ==> ..., value         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  M_SLL_IMM(s2, 3, REG_ITMP2);
                  M_IADD_IMM(REG_ITMP2, OFFSET(java_objectarray_t, data[0]), REG_ITMP2);
                  /* implicit null-pointer check */
                  M_ALDX(d, s1, REG_ITMP2);
                  emit_store_dst(jd, iptr, d);
                  break;


            case ICMD_BASTORE:    /* ..., arrayref, index, value  ==> ...         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  s3 = emit_load_s3(jd, iptr, REG_ITMP3);
                  M_IADD_IMM(s2, OFFSET(java_bytearray_t, data[0]), REG_ITMP2);
                  /* implicit null-pointer check */
                  M_STBX(s3, s1, REG_ITMP2);
                  break;

            case ICMD_CASTORE:    /* ..., arrayref, index, value  ==> ...         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  s3 = emit_load_s3(jd, iptr, REG_ITMP3);
                  M_SLL_IMM(s2, 1, REG_ITMP2);
                  M_IADD_IMM(REG_ITMP2, OFFSET(java_chararray_t, data[0]), REG_ITMP2);
                  /* implicit null-pointer check */
                  M_STHX(s3, s1, REG_ITMP2);
                  break;

            case ICMD_SASTORE:    /* ..., arrayref, index, value  ==> ...         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  s3 = emit_load_s3(jd, iptr, REG_ITMP3);
                  M_SLL_IMM(s2, 1, REG_ITMP2);
                  M_IADD_IMM(REG_ITMP2, OFFSET(java_shortarray_t, data[0]), REG_ITMP2);
                  M_STHX(s3, s1, REG_ITMP2);
                  break;

            case ICMD_IASTORE:    /* ..., arrayref, index, value  ==> ...         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  s3 = emit_load_s3(jd, iptr, REG_ITMP3);
                  M_SLL_IMM(s2, 2, REG_ITMP2);
                  M_IADD_IMM(REG_ITMP2, OFFSET(java_intarray_t, data[0]), REG_ITMP2);
                  /* implicit null-pointer check */
                  M_STWX(s3, s1, REG_ITMP2);
                  break;

            case ICMD_LASTORE:    /* ..., arrayref, index, value  ==> ...         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  s3 = emit_load_s3(jd, iptr, REG_ITMP3);
                  M_SLL_IMM(s2, 3, REG_ITMP2);
                  M_IADD_IMM(REG_ITMP2, OFFSET(java_longarray_t, data[0]), REG_ITMP2);
                  /* implicit null-pointer check */
                  M_LSTX(s3, s1, REG_ITMP2);
                  break;

            case ICMD_FASTORE:    /* ..., arrayref, index, value  ==> ...         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  s3 = emit_load_s3(jd, iptr, REG_FTMP3);
                  M_SLL_IMM(s2, 2, REG_ITMP2);
                  M_IADD_IMM(REG_ITMP2, OFFSET(java_floatarray_t, data[0]), REG_ITMP2);
                  /* implicit null-pointer check */
                  M_STFSX(s3, s1, REG_ITMP2);
                  break;

            case ICMD_DASTORE:    /* ..., arrayref, index, value  ==> ...         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  s3 = emit_load_s3(jd, iptr, REG_FTMP3);
                  M_SLL_IMM(s2, 3, REG_ITMP2);
                  M_IADD_IMM(REG_ITMP2, OFFSET(java_doublearray_t, data[0]), REG_ITMP2);
                  /* implicit null-pointer check */
                  M_STFDX(s3, s1, REG_ITMP2);
                  break;

            case ICMD_AASTORE:    /* ..., arrayref, index, value  ==> ...         */

                  s1 = emit_load_s1(jd, iptr, REG_A0);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  emit_arrayindexoutofbounds_check(cd, iptr, s1, s2);
                  s3 = emit_load_s3(jd, iptr, REG_A1);

                  disp = dseg_add_functionptr(cd, BUILTIN_FAST_canstore);
                  M_ALD(REG_ITMP3, REG_PV, disp);
                  M_ALD(REG_ITMP3, REG_ITMP3, 0); /* TOC */
                  M_MTCTR(REG_ITMP3);

                  M_INTMOVE(s1, REG_A0);
                  M_INTMOVE(s3, REG_A1);

                  M_JSR;
                  emit_arraystore_check(cd, iptr);

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  s3 = emit_load_s3(jd, iptr, REG_ITMP3);
                  M_SLL_IMM(s2, 3, REG_ITMP2);
                  M_IADD_IMM(REG_ITMP2, OFFSET(java_objectarray_t, data[0]), REG_ITMP2);
                  /* implicit null-pointer check */
                  M_ASTX(s3, s1, REG_ITMP2);
                  break;


            case ICMD_GETSTATIC:  /* ...  ==> ..., value                          */

                  if (INSTRUCTION_IS_UNRESOLVED(iptr)) {
                        uf        = iptr->sx.s23.s3.uf;
                        fieldtype = uf->fieldref->parseddesc.fd->type;
                        disp      = dseg_add_unique_address(cd, NULL);

                        patcher_add_patch_ref(jd, PATCHER_get_putstatic,
                                                      iptr->sx.s23.s3.uf, disp);

                  }
                  else {
                        fi        = iptr->sx.s23.s3.fmiref->p.field;
                        fieldtype = fi->type;
                        disp      = dseg_add_address(cd, fi->value);

                        if (!CLASS_IS_OR_ALMOST_INITIALIZED(fi->clazz)) {
                              patcher_add_patch_ref(jd, PATCHER_initialize_class, fi->clazz, disp);
                        }
                  }

                  M_ALD(REG_ITMP1, REG_PV, disp);
                  switch (fieldtype) {
                  case TYPE_INT:
                        d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                        M_ILD_INTERN(d, REG_ITMP1, 0);
                        break;
                  case TYPE_LNG:
                        d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                        M_LLD(d, REG_ITMP1, 0);
                        break;
                  case TYPE_ADR:
                        d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                        M_ALD_INTERN(d, REG_ITMP1, 0);
                        break;
                  case TYPE_FLT:
                        d = codegen_reg_of_dst(jd, iptr, REG_FTMP1);
                        M_FLD_INTERN(d, REG_ITMP1, 0);
                        break;
                  case TYPE_DBL:                      
                        d = codegen_reg_of_dst(jd, iptr, REG_FTMP1);
                        M_DLD_INTERN(d, REG_ITMP1, 0);
                        break;
                  }
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_PUTSTATIC:  /* ..., value  ==> ...                          */


                  if (INSTRUCTION_IS_UNRESOLVED(iptr)) {
                        uf        = iptr->sx.s23.s3.uf;
                        fieldtype = uf->fieldref->parseddesc.fd->type;
                        disp      = dseg_add_unique_address(cd, NULL);

                        patcher_add_patch_ref(jd, PATCHER_get_putstatic,
                                                      iptr->sx.s23.s3.uf, disp);
                  }
                  else {
                        fi        = iptr->sx.s23.s3.fmiref->p.field;
                        fieldtype = fi->type;
                        disp      = dseg_add_address(cd, fi->value);

                        if (!CLASS_IS_OR_ALMOST_INITIALIZED(fi->clazz)) {
                              patcher_add_patch_ref(jd, PATCHER_initialize_class, fi->clazz, disp);
                        }
                  }

                  M_ALD(REG_ITMP1, REG_PV, disp);
                  switch (fieldtype) {
                  case TYPE_INT:
                        s1 = emit_load_s1(jd, iptr, REG_ITMP2);
                        M_IST_INTERN(s1, REG_ITMP1, 0);
                        break;
                  case TYPE_LNG:
                        s1 = emit_load_s1(jd, iptr, REG_ITMP2);
                        M_LST_INTERN(s1, REG_ITMP1, 0);
                        break;
                  case TYPE_ADR:
                        s1 = emit_load_s1(jd, iptr, REG_ITMP2);
                        M_AST_INTERN(s1, REG_ITMP1, 0);
                        break;
                  case TYPE_FLT:
                        s1 = emit_load_s1(jd, iptr, REG_FTMP2);
                        M_FST_INTERN(s1, REG_ITMP1, 0);
                        break;
                  case TYPE_DBL:
                        s1 = emit_load_s1(jd, iptr, REG_FTMP2);
                        M_DST_INTERN(s1, REG_ITMP1, 0);
                        break;
                  }
                  break;


            case ICMD_GETFIELD:   /* ...  ==> ..., value                          */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);

                  if (INSTRUCTION_IS_UNRESOLVED(iptr)) {
                        uf        = iptr->sx.s23.s3.uf;
                        fieldtype = uf->fieldref->parseddesc.fd->type;
                        disp      = 0;

                        patcher_add_patch_ref(jd, PATCHER_get_putfield, uf, 0);
                  }
                  else {
                        fi        = iptr->sx.s23.s3.fmiref->p.field;
                        fieldtype = fi->type;
                        disp      = fi->offset;
                  }

                  /* implicit null-pointer check */
                  switch (fieldtype) {
                  case TYPE_INT:
                        d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                        M_ILD(d, s1, disp);
                        break;
                  case TYPE_LNG:
                        d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                        M_LLD(d, s1, disp);
                        break;
                  case TYPE_ADR:
                        d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                        M_ALD(d, s1, disp);
                        break;
                  case TYPE_FLT:
                        d = codegen_reg_of_dst(jd, iptr, REG_FTMP1);
                        M_FLD(d, s1, disp);
                        break;
                  case TYPE_DBL:                      
                        d = codegen_reg_of_dst(jd, iptr, REG_FTMP1);
                        M_DLD(d, s1, disp);
                        break;
                  }
                  emit_store_dst(jd, iptr, d);
                  break;

            case ICMD_PUTFIELD:   /* ..., value  ==> ...                          */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);

                  if (INSTRUCTION_IS_UNRESOLVED(iptr)) {
                        uf        = iptr->sx.s23.s3.uf;
                        fieldtype = uf->fieldref->parseddesc.fd->type;
                        disp      = 0;
                  }
                  else {
                        fi        = iptr->sx.s23.s3.fmiref->p.field;
                        fieldtype = fi->type;
                        disp      = fi->offset;
                  }

                  if (IS_INT_LNG_TYPE(fieldtype)) {
                        s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  }
                  else
                        s2 = emit_load_s2(jd, iptr, REG_FTMP2);

                  if (INSTRUCTION_IS_UNRESOLVED(iptr)) {
                        patcher_add_patch_ref(jd, PATCHER_get_putfield, uf, 0);
                  }


                  /* implicit null-pointer check */
                  switch (fieldtype) {
                  case TYPE_INT:
                        M_IST(s2, s1, disp);
                        break;
                  case TYPE_LNG:
                        M_LST(s2, s1, disp);
                        break;
                  case TYPE_ADR:
                        M_AST(s2, s1, disp);
                        break;
                  case TYPE_FLT:
                        M_FST(s2, s1, disp);
                        break;
                  case TYPE_DBL:
                        M_DST(s2, s1, disp);
                        break;
                  }
                  break;


            /* branch operations **************************************************/

            case ICMD_ATHROW:       /* ..., objectref ==> ... (, objectref)       */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  M_LNGMOVE(s1, REG_ITMP1_XPTR);

#ifdef ENABLE_VERIFIER
                  if (INSTRUCTION_IS_UNRESOLVED(iptr)) {
                        patcher_add_patch_ref(jd, PATCHER_resolve_class,
                                                      iptr->sx.s23.s2.uc, 0);
                  }
#endif /* ENABLE_VERIFIER */

                  disp = dseg_add_functionptr(cd, asm_handle_exception);
                  M_ALD(REG_ITMP2, REG_PV, disp);
                  M_MTCTR(REG_ITMP2);

                  if (code_is_leafmethod(code))
                        M_MFLR(REG_ITMP3);                          /* save LR        */

                  M_BL(0);                                        /* get current PC */
                  M_MFLR(REG_ITMP2_XPC);

                  if (code_is_leafmethod(code))
                        M_MTLR(REG_ITMP3);                          /* restore LR     */

                  M_RTS;                                          /* jump to CTR    */
                  ALIGNCODENOP;
                  break;

            case ICMD_GOTO:         /* ... ==> ...                                */
            case ICMD_RET:          /* ... ==> ...                                */

                  emit_br(cd, iptr->dst.block);
                  ALIGNCODENOP;
                  break;

            case ICMD_JSR:          /* ... ==> ...                                */

                  emit_br(cd, iptr->sx.s23.s3.jsrtarget.block);
                  ALIGNCODENOP;
                  break;

            case ICMD_IFNULL:       /* ..., value ==> ...                         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  M_TST(s1);
                  emit_beq(cd, iptr->dst.block);
                  break;

            case ICMD_IFNONNULL:    /* ..., value ==> ...                         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  M_TST(s1);
                  emit_bne(cd, iptr->dst.block);
                  break;

            case ICMD_IFLT:
            case ICMD_IFLE:
            case ICMD_IFNE:
            case ICMD_IFGT:
            case ICMD_IFGE:
            case ICMD_IFEQ:         /* ..., value ==> ...                         */

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  if ((iptr->sx.val.i >= -32768) && (iptr->sx.val.i <= 32767))
                        M_CMPI(s1, iptr->sx.val.i);
                  else {
                        ICONST(REG_ITMP2, iptr->sx.val.i);
                        M_CMP(s1, REG_ITMP2);
                  }
                  emit_bcc(cd, iptr->dst.block, iptr->opc - ICMD_IFEQ, BRANCH_OPT_NONE);
                  break;
                  
            case ICMD_IF_LEQ:       /* ..., value ==> ...                         */
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  LCONST(REG_ITMP2, iptr->sx.val.l);
                  M_CMP(s1, REG_ITMP2);
                  emit_beq(cd, iptr->dst.block);
                  break;
            case ICMD_IF_LLT:       /* ..., value ==> ...                         */
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  LCONST(REG_ITMP2, iptr->sx.val.l);
                  M_CMP(s1, REG_ITMP2);
                  emit_blt(cd, iptr->dst.block);
                  break;
            case ICMD_IF_LLE:       /* ..., value ==> ...                         */
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  LCONST(REG_ITMP2, iptr->sx.val.l);
                  M_CMP(s1, REG_ITMP2);
                  emit_ble(cd, iptr->dst.block);
                  break;

            case ICMD_IF_LNE:       /* ..., value ==> ... */
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  LCONST(REG_ITMP2, iptr->sx.val.l);
                  M_CMP(s1, REG_ITMP2);
                  emit_bne(cd, iptr->dst.block);
                  break;
            case ICMD_IF_LGE:       /* ..., value ==> ... */
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  LCONST(REG_ITMP2, iptr->sx.val.l);
                  M_CMP(s1, REG_ITMP2);
                  emit_bge(cd, iptr->dst.block);
                  break;
            case ICMD_IF_LGT:       /* ..., value ==> ...                         */
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  LCONST(REG_ITMP2, iptr->sx.val.l);
                  M_CMP(s1, REG_ITMP2);
                  emit_bgt(cd, iptr->dst.block);
                  break;
            case ICMD_IF_ICMPEQ:    /* ..., value, value ==> ...                  */
            case ICMD_IF_ACMPEQ:    /* op1 = target JavaVM pc                     */
            case ICMD_IF_LCMPEQ: 

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  M_CMP(s1, s2);
                  emit_beq(cd, iptr->dst.block);
                  break;

            case ICMD_IF_ICMPNE:    /* ..., value, value ==> ...                  */
            case ICMD_IF_ACMPNE:    /* op1 = target JavaVM pc                     */
            case ICMD_IF_LCMPNE:  

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  M_CMP(s1, s2);
                  emit_bne(cd, iptr->dst.block);
                  break;


            case ICMD_IF_ICMPLT:    /* ..., value, value ==> ...                  */
            case ICMD_IF_LCMPLT:

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  M_CMP(s1, s2);
                  emit_blt(cd, iptr->dst.block);
                  break;

            case ICMD_IF_ICMPGT:    /* ..., value, value ==> ...                  */
            case ICMD_IF_LCMPGT:

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  M_CMP(s1, s2);
                  emit_bgt(cd, iptr->dst.block);
                  break;

            case ICMD_IF_ICMPLE:    /* ..., value, value ==> ...                  */
            case ICMD_IF_LCMPLE:

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  M_CMP(s1, s2);
                  emit_ble(cd, iptr->dst.block);
                  break;

            case ICMD_IF_ICMPGE:    /* ..., value, value ==> ...                  */
            case ICMD_IF_LCMPGE:

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  s2 = emit_load_s2(jd, iptr, REG_ITMP2);
                  M_CMP(s1, s2);
                  emit_bge(cd, iptr->dst.block);
                  break;


            case ICMD_LRETURN:      /* ..., retvalue ==> ...                      */
            case ICMD_IRETURN:      /* ..., retvalue ==> ...                      */

                  REPLACEMENT_POINT_RETURN(cd, iptr);
                  s1 = emit_load_s1(jd, iptr, REG_RESULT);
                  M_LNGMOVE(s1, REG_RESULT);
                  goto nowperformreturn;

            case ICMD_ARETURN:      /* ..., retvalue ==> ...                      */

                  REPLACEMENT_POINT_RETURN(cd, iptr);
                  s1 = emit_load_s1(jd, iptr, REG_RESULT);
                  M_LNGMOVE(s1, REG_RESULT);

#ifdef ENABLE_VERIFIER
                  if (INSTRUCTION_IS_UNRESOLVED(iptr)) {
                        patcher_add_patch_ref(jd, PATCHER_resolve_class,
                                                      iptr->sx.s23.s2.uc, 0);
                  }
#endif /* ENABLE_VERIFIER */

                  goto nowperformreturn;

            case ICMD_FRETURN:      /* ..., retvalue ==> ...                      */
            case ICMD_DRETURN:

                  REPLACEMENT_POINT_RETURN(cd, iptr);
                  s1 = emit_load_s1(jd, iptr, REG_FRESULT);
                  M_FLTMOVE(s1, REG_FRESULT);
                  goto nowperformreturn;

            case ICMD_RETURN:      /* ...  ==> ...                                */

                  REPLACEMENT_POINT_RETURN(cd, iptr);

nowperformreturn:
                  {
                  s4 i, p;
                  
                  p = cd->stackframesize;

                  /* call trace function */

#if !defined(NDEBUG)
                  if (JITDATA_HAS_FLAG_VERBOSECALL(jd))
                        emit_verbosecall_exit(jd);
#endif            

#if defined(ENABLE_THREADS)
                  if (checksync && code_is_synchronized(code)) {
                        disp = dseg_add_functionptr(cd, LOCK_monitor_exit);
                        M_ALD(REG_ITMP3, REG_PV, disp);
                        M_ALD(REG_ITMP3, REG_ITMP3, 0); /* TOC */
                        M_MTCTR(REG_ITMP3);

                        /* we need to save the proper return value */

                        switch (iptr->opc) {
                        case ICMD_LRETURN:
                        case ICMD_IRETURN:
                        case ICMD_ARETURN:
                              /* fall through */
                              M_LST(REG_RESULT , REG_SP, rd->memuse * 8 + 8);
                              break;
                        case ICMD_FRETURN:
                              M_FST(REG_FRESULT, REG_SP, rd->memuse * 8 + 8);
                              break;
                        case ICMD_DRETURN:
                              M_DST(REG_FRESULT, REG_SP, rd->memuse * 8 + 8);
                              break;
                        }

                        M_ALD(REG_A0, REG_SP, rd->memuse * 8);
                        M_JSR;

                        /* and now restore the proper return value */

                        switch (iptr->opc) {
                        case ICMD_LRETURN:
                        case ICMD_IRETURN:
                        case ICMD_ARETURN:
                              /* fall through */
                              M_LLD(REG_RESULT , REG_SP, rd->memuse * 8 + 8);
                              break;
                        case ICMD_FRETURN:
                              M_FLD(REG_FRESULT, REG_SP, rd->memuse * 8 + 8);
                              break;
                        case ICMD_DRETURN:
                              M_DLD(REG_FRESULT, REG_SP, rd->memuse * 8 + 8);
                              break;
                        }
                  }
#endif

                  /* restore return address                                         */

                  if (!code_is_leafmethod(code)) {
                        /* ATTENTION: Don't use REG_ZERO (r0) here, as M_ALD
                           may have a displacement overflow. */

                        M_ALD(REG_ITMP1, REG_SP, p * 8 + LA_LR_OFFSET);
                        M_MTLR(REG_ITMP1);
                  }

                  /* restore saved registers                                        */

                  for (i = INT_SAV_CNT - 1; i >= rd->savintreguse; i--) {
                        p--; M_LLD(rd->savintregs[i], REG_SP, p * 8);
                  }
                  for (i = FLT_SAV_CNT - 1; i >= rd->savfltreguse; i--) {
                        p--; M_DLD(rd->savfltregs[i], REG_SP, p * 8);
                  }

                  /* deallocate stack                                               */

                  if (cd->stackframesize)
                        M_LDA(REG_SP, REG_SP, cd->stackframesize * 8);

                  M_RET;
                  ALIGNCODENOP;
                  }
                  break;


            case ICMD_TABLESWITCH:  /* ..., index ==> ...                         */
                  {
                  s4 i, l;
                  branch_target_t *table;

                  table = iptr->dst.table;

                  l = iptr->sx.s23.s2.tablelow;
                  i = iptr->sx.s23.s3.tablehigh;

                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  if (l == 0) {
                        M_INTMOVE(s1, REG_ITMP1);
                  } else if (l <= 32768) {
                        M_LDA(REG_ITMP1, s1, -l);
                  } else {
                        ICONST(REG_ITMP2, l);
                        M_SUB(s1, REG_ITMP2, REG_ITMP1);
                  }

                  /* number of targets */
                  i = i - l + 1;

                  /* range check */

                  M_CMPUI(REG_ITMP1, i - 1);
                  emit_bgt(cd, table[0].block);

                  /* build jump table top down and use address of lowest entry */

                  table += i;

                  while (--i >= 0) {
                        dseg_add_target(cd, table->block); 
                        --table;
                  }

                  /* length of dataseg after last dseg_add_unique_target is used by load */

                  M_SLL_IMM(REG_ITMP1, 3, REG_ITMP1);
                  M_IADD(REG_ITMP1, REG_PV, REG_ITMP2);
                  M_ALD(REG_ITMP2, REG_ITMP2, -(cd->dseglen));
                  M_MTCTR(REG_ITMP2);
                  M_RTS;
                  ALIGNCODENOP;
                  }
                  break;


            case ICMD_LOOKUPSWITCH: /* ..., key ==> ...                           */
                  {
                  s4 i, val;
                  lookup_target_t *lookup;

                  lookup = iptr->dst.lookup;

                  i = iptr->sx.s23.s2.lookupcount;
                  
                  MCODECHECK((i<<3)+8);
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  while (--i >= 0) {
                        val = lookup->value;
                        if ((val >= -32768) && (val <= 32767)) {
                              M_CMPI(s1, val);
                  
                        } else {
                              a = dseg_add_s4(cd, val);
                              M_ILD(REG_ITMP2, REG_PV, a);
                              M_CMP(s1, REG_ITMP2);
                        }
                        emit_beq(cd, lookup->target.block);
                        ++lookup;
                  }

                  emit_br(cd, iptr->sx.s23.s3.lookupdefault.block);

                  ALIGNCODENOP;
                  break;
                  }


            case ICMD_BUILTIN:      /* ..., [arg1, [arg2 ...]] ==> ...            */

                  bte = iptr->sx.s23.s3.bte;
                  md = bte->md;
                  goto gen_method;

            case ICMD_INVOKESTATIC: /* ..., [arg1, [arg2 ...]] ==> ...            */
            case ICMD_INVOKESPECIAL:/* ..., objectref, [arg1, [arg2 ...]] ==> ... */
            case ICMD_INVOKEVIRTUAL:/* op1 = arg count, val.a = method pointer    */
            case ICMD_INVOKEINTERFACE:

                  REPLACEMENT_POINT_INVOKE(cd, iptr);

                  if (INSTRUCTION_IS_UNRESOLVED(iptr)) {
                        lm = NULL;
                        um = iptr->sx.s23.s3.um;
                        md = um->methodref->parseddesc.md;
                  }
                  else {
                        lm = iptr->sx.s23.s3.fmiref->p.method;
                        um = NULL;
                        md = lm->parseddesc;
                  }

gen_method:
                  s3 = md->paramcount;

                  MCODECHECK((s3 << 2) + 128);

                  /* copy arguments to registers or stack location */

                  for (s3 = s3 - 1; s3 >= 0; s3--) {
                        var = VAR(iptr->sx.s23.s2.args[s3]);
                        d   = md->params[s3].regoff;

                        if (var->flags & PREALLOC)
                              continue;

                        if (IS_INT_LNG_TYPE(var->type)) {
                              if (!md->params[s3].inmemory) {
                                    s1 = emit_load(jd, iptr, var, d);
                                    M_LNGMOVE(s1, d);
                              }
                              else {
                                    s1 = emit_load(jd, iptr, var, REG_ITMP1);
                                    M_LST(s1, REG_SP, d);
                              }
                        }
                        else {
                              if (!md->params[s3].inmemory) {
                                    s1 = emit_load(jd, iptr, var, d);
                                    M_FLTMOVE(s1, d);
                              }
                              else {
                                    s1 = emit_load(jd, iptr, var, REG_FTMP1);
                                    M_DST(s1, REG_SP, d);
                              }
                        }
                  }

                  switch (iptr->opc) {
                  case ICMD_BUILTIN:
                        if (bte->stub == NULL) {
                              disp = dseg_add_functionptr(cd, bte->fp);
                              M_ALD(REG_PV, REG_PV, disp);
                              M_ALD(REG_PV, REG_PV, 0);     /* TOC */
                        }
                        else {
                              disp = dseg_add_functionptr(cd, bte->stub);
                              M_ALD(REG_PV, REG_PV, disp);
                        }

                        /* generate the actual call */
                        M_MTCTR(REG_PV);
                        M_JSR;
                        REPLACEMENT_POINT_INVOKE_RETURN(cd, iptr);
                        disp = (s4) (cd->mcodeptr - cd->mcodebase);
                        M_MFLR(REG_ITMP1);
                        M_LDA(REG_PV, REG_ITMP1, -disp);
                        break;

                  case ICMD_INVOKESPECIAL:
                        emit_nullpointer_check(cd, iptr, REG_A0);
                        /* fall through */

                  case ICMD_INVOKESTATIC:
                        if (lm == NULL) {
                              disp = dseg_add_unique_address(cd, um);

                              patcher_add_patch_ref(jd, PATCHER_invokestatic_special,
                                                            um, disp);
                        } else {
                              disp = dseg_add_address(cd, lm->stubroutine);
                        }
                        M_ALD(REG_PV, REG_PV, disp);

                        /* generate the actual call */

                        M_MTCTR(REG_PV);
                        M_JSR;
                        REPLACEMENT_POINT_INVOKE_RETURN(cd, iptr);
                        disp = (s4) (cd->mcodeptr - cd->mcodebase);
                        M_MFLR(REG_ITMP1);
                        M_LDA(REG_PV, REG_ITMP1, -disp);
                        break;

                  case ICMD_INVOKEVIRTUAL:
                        if (lm == NULL) {
                              patcher_add_patch_ref(jd, PATCHER_invokevirtual, um, 0);
                              s1 = 0;
                        } else {
                              s1 = OFFSET(vftbl_t, table[0]) +
                                    sizeof(methodptr) * lm->vftblindex;
                        }

                        /* implicit null-pointer check */
                        M_ALD(REG_METHODPTR, REG_A0, OFFSET(java_object_t, vftbl));
                        M_ALD(REG_PV, REG_METHODPTR, s1);

                        /* generate the actual call */

                        M_MTCTR(REG_PV);
                        M_JSR;
                        REPLACEMENT_POINT_INVOKE_RETURN(cd, iptr);
                        disp = (s4) (cd->mcodeptr - cd->mcodebase);
                        M_MFLR(REG_ITMP1);
                        M_LDA(REG_PV, REG_ITMP1, -disp);
                        break;

                  case ICMD_INVOKEINTERFACE:
                        if (lm == NULL) {
                              patcher_add_patch_ref(jd, PATCHER_invokeinterface, um, 0);

                              s1 = 0;
                              s2 = 0;

                        } else {
                              s1 = OFFSET(vftbl_t, interfacetable[0]) -
                                    sizeof(methodptr*) * lm->clazz->index;

                              s2 = sizeof(methodptr) * (lm - lm->clazz->methods);
                        }

                        /* implicit null-pointer check */
                        M_ALD(REG_METHODPTR, REG_A0, OFFSET(java_object_t, vftbl));    
                        M_ALD(REG_METHODPTR, REG_METHODPTR, s1);
                        M_ALD(REG_PV, REG_METHODPTR, s2);

                        /* generate the actual call */

                        M_MTCTR(REG_PV);
                        M_JSR;
                        REPLACEMENT_POINT_INVOKE_RETURN(cd, iptr);
                        disp = (s4) (cd->mcodeptr - cd->mcodebase);
                        M_MFLR(REG_ITMP1);
                        M_LDA(REG_PV, REG_ITMP1, -disp);

                        break;
                  }
                  /* store return value */

                  d = md->returntype.type;

                  if (d != TYPE_VOID) {
                        if (IS_INT_LNG_TYPE(d)) {
                              s1 = codegen_reg_of_dst(jd, iptr, REG_RESULT);
                              M_MOV(REG_RESULT, s1);
                        }
                        else {
                              s1 = codegen_reg_of_dst(jd, iptr, REG_FRESULT);
                              M_FLTMOVE(REG_FRESULT, s1);
                        }
                        emit_store_dst(jd, iptr, s1);
                  }
                  break;

            case ICMD_CHECKCAST:  /* ..., objectref ==> ..., objectref            */
                                  /* val.a: (classinfo*) superclass               */

                  /*  superclass is an interface:
                   *
                   *  OK if ((sub == NULL) ||
                   *         (sub->vftbl->interfacetablelength > super->index) &&
                   *         (sub->vftbl->interfacetable[-super->index] != NULL));
                   *
                   *  superclass is a class:
                   *
                   *  OK if ((sub == NULL) || (0
                   *         <= (sub->vftbl->baseval - super->vftbl->baseval) <=
                   *         super->vftbl->diffvall));
                   */

                  if (!(iptr->flags.bits & INS_FLAG_ARRAY)) {
                        /* object type cast-check */

                        classinfo *super;
                        s4         superindex;

                        if (INSTRUCTION_IS_UNRESOLVED(iptr)) {
                              super      = NULL;
                              superindex = 0;
                        }
                        else {
                              super      = iptr->sx.s23.s3.c.cls;
                              superindex = super->index;
                        }
            
                        s1 = emit_load_s1(jd, iptr, REG_ITMP1);

                        /* if class is not resolved, check which code to call */

                        if (super == NULL) {
                              M_TST(s1);
                              emit_label_beq(cd, BRANCH_LABEL_1);
                              disp = dseg_add_unique_s4(cd, 0);                     /* super->flags */

                              patcher_add_patch_ref(jd,
                                                            PATCHER_resolve_classref_to_flags,
                                                            iptr->sx.s23.s3.c.ref,
                                                            disp);

                              M_ILD(REG_ITMP2, REG_PV, disp);
                              M_AND_IMM(REG_ITMP2, ACC_INTERFACE, REG_ITMP2);

                              emit_label_beq(cd, BRANCH_LABEL_2);
                        }

                        /* interface checkcast code */

                        if ((super == NULL) || (super->flags & ACC_INTERFACE)) {
                              if (super == NULL) {
                                    patcher_add_patch_ref(jd,
                                                                  PATCHER_checkcast_interface,
                                                                  iptr->sx.s23.s3.c.ref,
                                                                  0);
                              } else {
                                    M_TST(s1);
                                    emit_label_beq(cd, BRANCH_LABEL_3);
                              }

                              M_ALD(REG_ITMP2, s1, OFFSET(java_object_t, vftbl));
                              M_ILD(REG_ITMP3, REG_ITMP2, OFFSET(vftbl_t, interfacetablelength));
                              M_LDATST(REG_ITMP3, REG_ITMP3, -superindex);
                              emit_classcast_check(cd, iptr, BRANCH_LE, REG_ITMP3, s1);
                              M_ALD(REG_ITMP3, REG_ITMP2,
                                      OFFSET(vftbl_t, interfacetable[0]) -
                                      superindex * sizeof(methodptr*));
                              M_TST(REG_ITMP3);
                              emit_classcast_check(cd, iptr, BRANCH_EQ, REG_ITMP3, s1);

                              if (super == NULL)      {
                                    emit_label_br(cd, BRANCH_LABEL_4);
                              } else      {
                                    emit_label(cd, BRANCH_LABEL_3);
                              }
                        }

                        /* class checkcast code */

                        if ((super == NULL) || !(super->flags & ACC_INTERFACE)) {
                              if (super == NULL) {
                                    emit_label(cd, BRANCH_LABEL_2);

                                    disp = dseg_add_unique_address(cd, NULL);
                                    patcher_add_patch_ref(jd, PATCHER_resolve_classref_to_vftbl,
                                                                  iptr->sx.s23.s3.c.ref,
                                                                  disp);
                              } else {
                                    disp = dseg_add_address(cd, super->vftbl);
                                    M_TST(s1);
                                    emit_label_beq(cd, BRANCH_LABEL_5);
                              }

                              M_ALD(REG_ITMP2, s1, OFFSET(java_object_t, vftbl));

                              M_ILD(REG_ITMP3, REG_ITMP2, OFFSET(vftbl_t, baseval));
                              M_ALD(REG_ITMP2, REG_PV, disp);
                              if (s1 != REG_ITMP1) {
                                    M_ILD(REG_ITMP1, REG_ITMP2, OFFSET(vftbl_t, baseval));
                                    M_ILD(REG_ITMP2, REG_ITMP2, OFFSET(vftbl_t, diffval));

                                    M_SUB(REG_ITMP3, REG_ITMP1, REG_ITMP3);
                                    M_EXTSW(REG_ITMP3, REG_ITMP3);
                              } else {
                                    M_ILD(REG_ITMP2, REG_ITMP2, OFFSET(vftbl_t, baseval));
                                    M_SUB(REG_ITMP3, REG_ITMP2, REG_ITMP3);
                                    M_EXTSW(REG_ITMP3, REG_ITMP3);
                                    M_ALD(REG_ITMP2, REG_PV, disp);
                                    M_ILD(REG_ITMP2, REG_ITMP2, OFFSET(vftbl_t, diffval));
                              }
                              M_CMPU(REG_ITMP3, REG_ITMP2);
                              emit_classcast_check(cd, iptr, BRANCH_GT, REG_ITMP3, s1);
                              
                              if (super != NULL)
                                    emit_label(cd, BRANCH_LABEL_5);
                        }

                        if (super == NULL) {
                              emit_label(cd, BRANCH_LABEL_1);
                              emit_label(cd, BRANCH_LABEL_4);
                        }
                        d = codegen_reg_of_dst(jd, iptr, s1);

                  } else {
                        /* array type cast-check */

                        s1 = emit_load_s1(jd, iptr, REG_A0);
                        M_INTMOVE(s1, REG_A0);


                        if (INSTRUCTION_IS_UNRESOLVED(iptr)) {
                              disp = dseg_add_unique_address(cd, NULL);
                              patcher_add_patch_ref(jd, PATCHER_resolve_classref_to_classinfo,
                                                            iptr->sx.s23.s3.c.ref,
                                                            disp);
                        } else {
                              disp = dseg_add_address(cd, iptr->sx.s23.s3.c.cls);
                        }

                        M_ALD(REG_A1, REG_PV, disp);
                        disp = dseg_add_functionptr(cd, BUILTIN_arraycheckcast);
                        M_ALD(REG_ITMP2, REG_PV, disp);
                        M_ALD(REG_ITMP2, REG_ITMP2, 0);     /* TOC */
                        M_MTCTR(REG_ITMP2);
                        M_JSR;
                        M_TST(REG_RESULT);
                        emit_classcast_check(cd, iptr, BRANCH_EQ, REG_RESULT, s1);

                        s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                        d = codegen_reg_of_dst(jd, iptr, s1);
                  }
                  M_INTMOVE(s1, d);
                  emit_store_dst(jd, iptr, d);
                  break;


            case ICMD_INSTANCEOF: /* ..., objectref ==> ..., intresult            */
                                  /* val.a: (classinfo*) superclass               */

                  /*  superclass is an interface:
                   *
                   *  return (sub != NULL) &&
                   *         (sub->vftbl->interfacetablelength > super->index) &&
                   *         (sub->vftbl->interfacetable[-super->index] != NULL);
                   *
                   *  superclass is a class:
                   *
                   *  return ((sub != NULL) && (0
                   *          <= (sub->vftbl->baseval - super->vftbl->baseval) <=
                   *          super->vftbl->diffvall));
                   */

                  {
                  classinfo *super;
                  s4         superindex;

                  if (INSTRUCTION_IS_UNRESOLVED(iptr)) {
                        super      = NULL;
                        superindex = 0;
                  }
                  else {
                        super      = iptr->sx.s23.s3.c.cls;
                        superindex = super->index;
                  }
                  
                  s1 = emit_load_s1(jd, iptr, REG_ITMP1);
                  d = codegen_reg_of_dst(jd, iptr, REG_ITMP2);
                  if (s1 == d) {
                        M_MOV(s1, REG_ITMP1);
                        s1 = REG_ITMP1;
                  }

                  M_CLR(d);

                  /* if class is not resolved, check which code to call */

                  if (super == NULL) {
                        M_TST(s1);
                        emit_label_beq(cd, BRANCH_LABEL_1);
                        disp = dseg_add_unique_s4(cd, 0);                     /* super->flags */

                        patcher_add_patch_ref(jd, PATCHER_resolve_classref_to_flags,
                                                      iptr->sx.s23.s3.c.ref, disp);

                        M_ILD(REG_ITMP3, REG_PV, disp);
                        M_AND_IMM(REG_ITMP3, ACC_INTERFACE, REG_ITMP3);
                        emit_label_beq(cd, BRANCH_LABEL_2);
                  }

                  /* interface instanceof code */

                  if ((super == NULL) || (super->flags & ACC_INTERFACE)) {
                        if (super == NULL) {
                              patcher_add_patch_ref(jd,
                                                            PATCHER_instanceof_interface,
                                                            iptr->sx.s23.s3.c.ref, 0);

                        } else {
                              M_TST(s1);
                              emit_label_beq(cd, BRANCH_LABEL_3);
                        }

                        M_ALD(REG_ITMP1, s1, OFFSET(java_object_t, vftbl));
                        M_ILD(REG_ITMP3, REG_ITMP1, OFFSET(vftbl_t, interfacetablelength));
                        M_LDATST(REG_ITMP3, REG_ITMP3, -superindex);
                        M_BLE(4);
                        M_ALD(REG_ITMP1, REG_ITMP1,
                                OFFSET(vftbl_t, interfacetable[0]) -
                                superindex * sizeof(methodptr*));
                        M_TST(REG_ITMP1);
                        M_BEQ(1);
                        M_IADD_IMM(REG_ZERO, 1, d);

                        if (super == NULL)      {
                              emit_label_br(cd, BRANCH_LABEL_4);
                        } else      {
                              emit_label(cd, BRANCH_LABEL_3);
                        }
                  }

                  /* class instanceof code */

                  if ((super == NULL) || !(super->flags & ACC_INTERFACE)) {

                        if (super == NULL) {
                              emit_label(cd, BRANCH_LABEL_2);

                              disp = dseg_add_unique_address(cd, NULL);
                              patcher_add_patch_ref(jd, PATCHER_resolve_classref_to_vftbl,
                                                            iptr->sx.s23.s3.c.ref,
                                                            disp);

                        } else {
                              disp = dseg_add_address(cd, super->vftbl);
                              M_TST(s1);
                              emit_label_beq(cd, BRANCH_LABEL_5);
                        }

                        M_ALD(REG_ITMP1, s1, OFFSET(java_object_t, vftbl));
                        M_ALD(REG_ITMP2, REG_PV, disp);

                        M_ILD(REG_ITMP1, REG_ITMP1, OFFSET(vftbl_t, baseval));
                        M_ILD(REG_ITMP3, REG_ITMP2, OFFSET(vftbl_t, baseval));
                        M_ILD(REG_ITMP2, REG_ITMP2, OFFSET(vftbl_t, diffval));

                        M_SUB(REG_ITMP1, REG_ITMP3, REG_ITMP1);
                        M_EXTSW(REG_ITMP1, REG_ITMP1);
                        M_CMPU(REG_ITMP1, REG_ITMP2);
                        M_CLR(d);
                        M_BGT(1);
                        M_IADD_IMM(REG_ZERO, 1, d);

                        if (super != NULL)
                              emit_label(cd, BRANCH_LABEL_5);
                  }

                  if (super == NULL) {
                        emit_label(cd, BRANCH_LABEL_1);
                        emit_label(cd, BRANCH_LABEL_4);
                  }

                  emit_store_dst(jd, iptr, d);
                  }
                  break;

            case ICMD_MULTIANEWARRAY:/* ..., cnt1, [cnt2, ...] ==> ..., arrayref  */

                  /* check for negative sizes and copy sizes to stack if necessary  */

                  MCODECHECK((iptr->s1.argcount << 2) + 128);

                  for (s1 = iptr->s1.argcount; --s1 >= 0; ) {

                        var = VAR(iptr->sx.s23.s2.args[s1]);

                        /* copy SAVEDVAR sizes to stack */

                        if (!(var->flags & PREALLOC)) {
                              s2 = emit_load(jd, iptr, var, REG_ITMP1);
#if defined(__DARWIN__)
                              M_LST(s2, REG_SP, LA_SIZE + (s1 + INT_ARG_CNT) * 8);
#else
                              M_LST(s2, REG_SP, LA_SIZE + (s1 + 3) * 8);
#endif
                        }
                  }

                  /* a0 = dimension count */

                  ICONST(REG_A0, iptr->s1.argcount);

                  /* is patcher function set? */

                  if (INSTRUCTION_IS_UNRESOLVED(iptr)) {
                        disp = dseg_add_unique_address(cd, NULL);

                        patcher_add_patch_ref(jd, PATCHER_resolve_classref_to_classinfo,
                                                      iptr->sx.s23.s3.c.ref, disp);
                  } else {
                        disp = dseg_add_address(cd, iptr->sx.s23.s3.c.cls);
                  }

                  /* a1 = arraydescriptor */

                  M_ALD(REG_A1, REG_PV, disp);

                  /* a2 = pointer to dimensions = stack pointer */

#if defined(__DARWIN__)
                  M_LDA(REG_A2, REG_SP, LA_SIZE + INT_ARG_CNT * 8);
#else
                  M_LDA(REG_A2, REG_SP, LA_SIZE + 3 * 8);
#endif

                  disp = dseg_add_functionptr(cd, BUILTIN_multianewarray);
                  M_ALD(REG_ITMP3, REG_PV, disp);
                  M_ALD(REG_ITMP3, REG_ITMP3, 0); /* TOC */
                  M_MTCTR(REG_ITMP3);
                  M_JSR;

                  /* check for exception before result assignment */
                  emit_exception_check(cd, iptr);

                  d = codegen_reg_of_dst(jd, iptr, REG_RESULT);
                  M_INTMOVE(REG_RESULT, d);
                  emit_store_dst(jd, iptr, d);
                  break;

            default:
                  exceptions_throw_internalerror("Unknown ICMD %d during code generation",
                                                               iptr->opc);
                  return false;
      } /* switch */
            
      } /* for instruction */
            
      } /* if (bptr -> flags >= BBREACHED) */
      } /* for basic block */

      /* generate traps */

      emit_patcher_traps(jd);

      /* everything's ok */

      return true;
}


/* codegen_emit_stub_native ****************************************************

   Emits a stub routine which calls a native method.

*******************************************************************************/

void codegen_emit_stub_native(jitdata *jd, methoddesc *nmd, functionptr f, int skipparams)
{
      methodinfo  *m;
      codeinfo    *code;
      codegendata *cd;
      methoddesc  *md;
      s4           i, j;
      s4           t;
      int          s1, s2;
      int          disp;

      /* get required compiler data */

      m    = jd->m;
      code = jd->code;
      cd   = jd->cd;

      /* Sanity check. */

      assert(!code_is_leafmethod(code));

      /* set some variables */

      md = m->parseddesc;

      /* calculate stackframe size */

      cd->stackframesize =
            sizeof(stackframeinfo_t) / SIZEOF_VOID_P +
            sizeof(localref_table) / SIZEOF_VOID_P +
            4 +                            /* 4 stackframeinfo arguments (darwin)*/
            nmd->paramcount  + 
            nmd->memuse;

/*    cd->stackframesize = (cd->stackframesize + 3) & ~3;*/ /* keep stack 16-byte aligned */

      /* create method header */

      (void) dseg_add_unique_address(cd, code);              /* CodeinfoPointer */
      (void) dseg_add_unique_s4(cd, cd->stackframesize * 8); /* FrameSize       */
      (void) dseg_add_unique_s4(cd, 0);                      /* IsLeaf          */
      (void) dseg_add_unique_s4(cd, 0);                      /* IntSave         */
      (void) dseg_add_unique_s4(cd, 0);                      /* FltSave         */

      /* generate code */

      M_MFLR(REG_ZERO);
      M_AST_INTERN(REG_ZERO, REG_SP, LA_LR_OFFSET);
      M_STDU(REG_SP, REG_SP, -(cd->stackframesize * 8));

      /* save integer and float argument registers */

      for (i = 0; i < md->paramcount; i++) {
            if (!md->params[i].inmemory) {
                  s1 = md->params[i].regoff;

                  switch (md->paramtypes[i].type) {
                  case TYPE_INT:
                  case TYPE_LNG:
                  case TYPE_ADR:
                        M_LST(s1, REG_SP, LA_SIZE + PA_SIZE + 4 * 8 + i * 8);
                        break;
                  case TYPE_FLT:
                  case TYPE_DBL:
                        M_DST(s1, REG_SP, LA_SIZE + PA_SIZE + 4 * 8 + i * 8);
                        break;
                  }
            }
      }

      /* create native stack info */

      M_MOV(REG_SP, REG_A0);
      M_MOV(REG_PV, REG_A1);
      disp = dseg_add_functionptr(cd, codegen_start_native_call);
      M_ALD(REG_ITMP1, REG_PV, disp);
      M_ALD(REG_ITMP1, REG_ITMP1, 0);           /* TOC */
      M_MTCTR(REG_ITMP1);
      M_JSR;

      /* remember class argument */

      if (m->flags & ACC_STATIC)
            M_MOV(REG_RESULT, REG_ITMP3);

      /* restore integer and float argument registers */

      for (i = 0; i < md->paramcount; i++) {
            if (!md->params[i].inmemory) {
                  s1 = md->params[i].regoff;

                  switch (md->paramtypes[i].type) {
                  case TYPE_INT:
                  case TYPE_LNG:
                  case TYPE_ADR:
                        M_LLD(s1, REG_SP, LA_SIZE + PA_SIZE + 4 * 8 + i * 8);
                        break;
                  case TYPE_FLT:
                  case TYPE_DBL:
                        M_DLD(s1, REG_SP, LA_SIZE + PA_SIZE + 4 * 8 + i * 8);
                        break;
                  }
            }
      }
      
      /* copy or spill arguments to new locations */

      for (i = md->paramcount - 1, j = i + skipparams; i >= 0; i--, j--) {
            t = md->paramtypes[i].type;

            if (IS_INT_LNG_TYPE(t)) {
                  if (!md->params[i].inmemory) {
                        s1 = md->params[i].regoff;
                        s2 = nmd->params[j].regoff;

                        if (!nmd->params[j].inmemory)
                              M_INTMOVE(s1, s2);
                        else
                              M_LST(s1, REG_SP, s2);
                  }
                  else {
                        s1 = md->params[i].regoff + cd->stackframesize * 8;
                        s2 = nmd->params[j].regoff;

                        M_LLD(REG_ITMP1, REG_SP, s1);
                        M_LST(REG_ITMP1, REG_SP, s2);
                  }
            }
            else {
                  /* We only copy spilled float arguments, as the float
                     argument registers keep unchanged. */

                  if (md->params[i].inmemory) {
                        s1 = md->params[i].regoff + cd->stackframesize * 8;
                        s2 = nmd->params[j].regoff;

                        M_DLD(REG_FTMP1, REG_SP, s1);

                        if (IS_2_WORD_TYPE(t))
                              M_DST(REG_FTMP1, REG_SP, s2);
                        else
                              M_FST(REG_FTMP1, REG_SP, s2 + 4);
                  }
            }
      }

      /* Handle native Java methods. */

      if (m->flags & ACC_NATIVE) {
            /* put class into second argument register */

            if (m->flags & ACC_STATIC)
                  M_MOV(REG_ITMP3, REG_A1);

            /* put env into first argument register */

            disp = dseg_add_unique_address(cd, _Jv_env);
            M_ALD(REG_A0, REG_PV, disp);
      }

      /* Call the native function. */
      /* native functions have a different TOC for sure */

      M_AST(REG_TOC, REG_SP, 40);   /* save old TOC */
      disp = dseg_add_functionptr(cd, f);
      M_ALD(REG_ITMP3, REG_PV, disp);
      M_ALD(REG_TOC, REG_ITMP3, 8); /* load TOC from func. descriptor */
      M_ALD(REG_ITMP3, REG_ITMP3, 0);           
      M_MTCTR(REG_ITMP3);
      M_JSR;
      M_ALD(REG_TOC, REG_SP, 40);   /* restore TOC */

      /* save return value */

      if (md->returntype.type != TYPE_VOID) {
            if (IS_INT_LNG_TYPE(md->returntype.type)) {
                  M_LST(REG_RESULT, REG_SP, LA_SIZE + PA_SIZE + 2 * 8);
            }
            else {
                  M_DST(REG_FRESULT, REG_SP, LA_SIZE + PA_SIZE + 2 * 8);
            }
      }

      /* remove native stackframe info */

      M_MOV(REG_SP, REG_A0);
      M_MOV(REG_PV, REG_A1);
      disp = dseg_add_functionptr(cd, codegen_finish_native_call);
      M_ALD(REG_ITMP1, REG_PV, disp);
      M_ALD(REG_ITMP1, REG_ITMP1, 0);     /* XXX what about TOC? */
      M_MTCTR(REG_ITMP1);
      M_JSR;
      M_MOV(REG_RESULT, REG_ITMP1_XPTR);

      /* restore return value */

      if (md->returntype.type != TYPE_VOID) {
            if (IS_INT_LNG_TYPE(md->returntype.type)) {
                  M_LLD(REG_RESULT, REG_SP, LA_SIZE + PA_SIZE + 2 * 8);
            }
            else {
                  M_DLD(REG_FRESULT, REG_SP, LA_SIZE + PA_SIZE + 2 * 8);
            }
      }

      M_ALD(REG_ITMP2_XPC, REG_SP, cd->stackframesize * 8 + LA_LR_OFFSET);
      M_MTLR(REG_ITMP2_XPC);
      M_LDA(REG_SP, REG_SP, cd->stackframesize * 8); /* remove stackframe           */

      /* check for exception */

      M_TST(REG_ITMP1_XPTR);
      M_BNE(1);                           /* if no exception then return        */

      M_RET;

      /* handle exception */

      M_LADD_IMM(REG_ITMP2_XPC, -4, REG_ITMP2_XPC);  /* exception address       */

      disp = dseg_add_functionptr(cd, asm_handle_nat_exception);
      M_ALD(REG_ITMP3, REG_PV, disp);
      M_MTCTR(REG_ITMP3);
      M_RTS;
}


/*
 * These are local overrides for various environment variables in Emacs.
 * Please do not remove this and leave it at the end of the file, where
 * Emacs will automagically detect them.
 * ---------------------------------------------------------------------
 * Local variables:
 * mode: c
 * indent-tabs-mode: t
 * c-basic-offset: 4
 * tab-width: 4
 * End:
 * vim:noexpandtab:sw=4:ts=4:
 */

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