compiler/dex/quick/x86/fp_x86.cc - platform/art - Gitiles

 /*
  * Copyright (C) 2012 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "codegen_x86.h"
 #include "dex/quick/mir_to_lir-inl.h"
 #include "x86_lir.h"

 namespace art {

 void X86Mir2Lir::GenArithOpFloat(Instruction::Code opcode,
                                  RegLocation rl_dest, RegLocation rl_src1, RegLocation rl_src2) {
   X86OpCode op = kX86Nop;
   RegLocation rl_result;

   /*
    * Don't attempt to optimize register usage since these opcodes call out to
    * the handlers.
    */
   switch (opcode) {
     case Instruction::ADD_FLOAT_2ADDR:
     case Instruction::ADD_FLOAT:
       op = kX86AddssRR;
       break;
     case Instruction::SUB_FLOAT_2ADDR:
     case Instruction::SUB_FLOAT:
       op = kX86SubssRR;
       break;
     case Instruction::DIV_FLOAT_2ADDR:
     case Instruction::DIV_FLOAT:
       op = kX86DivssRR;
       break;
     case Instruction::MUL_FLOAT_2ADDR:
     case Instruction::MUL_FLOAT:
       op = kX86MulssRR;
       break;
     case Instruction::REM_FLOAT_2ADDR:
     case Instruction::REM_FLOAT:
       FlushAllRegs();   // Send everything to home location
       CallRuntimeHelperRegLocationRegLocation(QUICK_ENTRYPOINT_OFFSET(4, pFmodf), rl_src1, rl_src2,
                                               false);
       rl_result = GetReturn(true);
       StoreValue(rl_dest, rl_result);
       return;
     case Instruction::NEG_FLOAT:
       GenNegFloat(rl_dest, rl_src1);
       return;
     default:
       LOG(FATAL) << "Unexpected opcode: " << opcode;
   }
   rl_src1 = LoadValue(rl_src1, kFPReg);
   rl_src2 = LoadValue(rl_src2, kFPReg);
   rl_result = EvalLoc(rl_dest, kFPReg, true);
   RegStorage r_dest = rl_result.reg;
   RegStorage r_src1 = rl_src1.reg;
   RegStorage r_src2 = rl_src2.reg;
   if (r_dest == r_src2) {
     r_src2 = AllocTempFloat();
     OpRegCopy(r_src2, r_dest);
   }
   OpRegCopy(r_dest, r_src1);
   NewLIR2(op, r_dest.GetReg(), r_src2.GetReg());
   StoreValue(rl_dest, rl_result);
 }

 void X86Mir2Lir::GenArithOpDouble(Instruction::Code opcode,
                                   RegLocation rl_dest, RegLocation rl_src1, RegLocation rl_src2) {
   X86OpCode op = kX86Nop;
   RegLocation rl_result;

   switch (opcode) {
     case Instruction::ADD_DOUBLE_2ADDR:
     case Instruction::ADD_DOUBLE:
       op = kX86AddsdRR;
       break;
     case Instruction::SUB_DOUBLE_2ADDR:
     case Instruction::SUB_DOUBLE:
       op = kX86SubsdRR;
       break;
     case Instruction::DIV_DOUBLE_2ADDR:
     case Instruction::DIV_DOUBLE:
       op = kX86DivsdRR;
       break;
     case Instruction::MUL_DOUBLE_2ADDR:
     case Instruction::MUL_DOUBLE:
       op = kX86MulsdRR;
       break;
     case Instruction::REM_DOUBLE_2ADDR:
     case Instruction::REM_DOUBLE:
       FlushAllRegs();   // Send everything to home location
       CallRuntimeHelperRegLocationRegLocation(QUICK_ENTRYPOINT_OFFSET(4, pFmod), rl_src1, rl_src2,
                                               false);
       rl_result = GetReturnWide(true);
       StoreValueWide(rl_dest, rl_result);
       return;
     case Instruction::NEG_DOUBLE:
       GenNegDouble(rl_dest, rl_src1);
       return;
     default:
       LOG(FATAL) << "Unexpected opcode: " << opcode;
   }
   rl_src1 = LoadValueWide(rl_src1, kFPReg);
   DCHECK(rl_src1.wide);
   rl_src2 = LoadValueWide(rl_src2, kFPReg);
   DCHECK(rl_src2.wide);
   rl_result = EvalLoc(rl_dest, kFPReg, true);
   DCHECK(rl_dest.wide);
   DCHECK(rl_result.wide);
   // TODO: update with direct 64-bit reg.
   int r_dest = S2d(rl_result.reg.GetLowReg(), rl_result.reg.GetHighReg());
   int r_src1 = S2d(rl_src1.reg.GetLowReg(), rl_src1.reg.GetHighReg());
   int r_src2 = S2d(rl_src2.reg.GetLowReg(), rl_src2.reg.GetHighReg());
   if (r_dest == r_src2) {
     r_src2 = AllocTempDouble().GetLowReg() | X86_FP_DOUBLE;
     OpRegCopy(RegStorage::Solo64(r_src2), RegStorage::Solo64(r_dest));
   }
   OpRegCopy(RegStorage::Solo64(r_dest), RegStorage::Solo64(r_src1));
   NewLIR2(op, r_dest, r_src2);
   StoreValueWide(rl_dest, rl_result);
 }

 void X86Mir2Lir::GenLongToFP(RegLocation rl_dest, RegLocation rl_src, bool is_double) {
   // Compute offsets to the source and destination VRs on stack
   int src_v_reg_offset = SRegOffset(rl_src.s_reg_low);
   int dest_v_reg_offset = SRegOffset(rl_dest.s_reg_low);

   // Update the in-register state of source.
   rl_src = UpdateLocWide(rl_src);

   // If the source is in physical register, then put it in its location on stack.
   if (rl_src.location == kLocPhysReg) {
     RegisterInfo* lo_info = GetRegInfo(rl_src.reg.GetLowReg());

     if (lo_info != nullptr && lo_info->is_temp) {
       // Calling FlushSpecificReg because it will only write back VR if it is dirty.
       FlushSpecificReg(lo_info);
       // ResetDef for low/high to prevent NullifyRange from removing stores.
       ResetDef(rl_src.reg.GetLowReg());
       if (rl_src.reg.GetLowReg() != rl_src.reg.GetHighReg() && GetRegInfo(rl_src.reg.GetHighReg()) != nullptr) {
         ResetDef(rl_src.reg.GetHighReg());
       }
     } else {
       // It must have been register promoted if it is not a temp but is still in physical
       // register. Since we need it to be in memory to convert, we place it there now.
       StoreBaseDispWide(TargetReg(kSp), src_v_reg_offset, rl_src.reg);
     }
   }

   // Push the source virtual register onto the x87 stack.
   LIR *fild64 = NewLIR2NoDest(kX86Fild64M, TargetReg(kSp).GetReg(), src_v_reg_offset + LOWORD_OFFSET);
   AnnotateDalvikRegAccess(fild64, (src_v_reg_offset + LOWORD_OFFSET) >> 2,
       true /* is_load */, true /* is64bit */);

   // Now pop off x87 stack and store it in the destination VR's stack location.
   int opcode = is_double ? kX86Fstp64M : kX86Fstp32M;
   int displacement = is_double ? dest_v_reg_offset + LOWORD_OFFSET : dest_v_reg_offset;
   LIR *fstp = NewLIR2NoDest(opcode, TargetReg(kSp).GetReg(), displacement);
   AnnotateDalvikRegAccess(fstp, displacement >> 2, false /* is_load */, is_double);

   /*
    * The result is in a physical register if it was in a temp or was register
    * promoted. For that reason it is enough to check if it is in physical
    * register. If it is, then we must do all of the bookkeeping necessary to
    * invalidate temp (if needed) and load in promoted register (if needed).
    * If the result's location is in memory, then we do not need to do anything
    * more since the fstp has already placed the correct value in memory.
    */
   RegLocation rl_result = is_double ? UpdateLocWide(rl_dest) : UpdateLoc(rl_dest);
   if (rl_result.location == kLocPhysReg) {
     /*
      * We already know that the result is in a physical register but do not know if it is the
      * right class. So we call EvalLoc(Wide) first which will ensure that it will get moved to the
      * correct register class.
      */
     if (is_double) {
       rl_result = EvalLocWide(rl_dest, kFPReg, true);

       LoadBaseDispWide(TargetReg(kSp), dest_v_reg_offset, rl_result.reg, INVALID_SREG);

       StoreFinalValueWide(rl_dest, rl_result);
     } else {
       rl_result = EvalLoc(rl_dest, kFPReg, true);

       Load32Disp(TargetReg(kSp), dest_v_reg_offset, rl_result.reg);

       StoreFinalValue(rl_dest, rl_result);
     }
   }
 }

 void X86Mir2Lir::GenConversion(Instruction::Code opcode, RegLocation rl_dest,
                                RegLocation rl_src) {
   RegisterClass rcSrc = kFPReg;
   X86OpCode op = kX86Nop;
   int src_reg;
   RegLocation rl_result;
   switch (opcode) {
     case Instruction::INT_TO_FLOAT:
       rcSrc = kCoreReg;
       op = kX86Cvtsi2ssRR;
       break;
     case Instruction::DOUBLE_TO_FLOAT:
       rcSrc = kFPReg;
       op = kX86Cvtsd2ssRR;
       break;
     case Instruction::FLOAT_TO_DOUBLE:
       rcSrc = kFPReg;
       op = kX86Cvtss2sdRR;
       break;
     case Instruction::INT_TO_DOUBLE:
       rcSrc = kCoreReg;
       op = kX86Cvtsi2sdRR;
       break;
     case Instruction::FLOAT_TO_INT: {
       rl_src = LoadValue(rl_src, kFPReg);
       src_reg = rl_src.reg.GetReg();
       // In case result vreg is also src vreg, break association to avoid useless copy by EvalLoc()
       ClobberSReg(rl_dest.s_reg_low);
       rl_result = EvalLoc(rl_dest, kCoreReg, true);
       int temp_reg = AllocTempFloat().GetReg();

       LoadConstant(rl_result.reg, 0x7fffffff);
       NewLIR2(kX86Cvtsi2ssRR, temp_reg, rl_result.reg.GetReg());
       NewLIR2(kX86ComissRR, src_reg, temp_reg);
       LIR* branch_pos_overflow = NewLIR2(kX86Jcc8, 0, kX86CondA);
       LIR* branch_na_n = NewLIR2(kX86Jcc8, 0, kX86CondP);
       NewLIR2(kX86Cvttss2siRR, rl_result.reg.GetReg(), src_reg);
       LIR* branch_normal = NewLIR1(kX86Jmp8, 0);
       branch_na_n->target = NewLIR0(kPseudoTargetLabel);
       NewLIR2(kX86Xor32RR, rl_result.reg.GetReg(), rl_result.reg.GetReg());
       branch_pos_overflow->target = NewLIR0(kPseudoTargetLabel);
       branch_normal->target = NewLIR0(kPseudoTargetLabel);
       StoreValue(rl_dest, rl_result);
       return;
     }
     case Instruction::DOUBLE_TO_INT: {
       rl_src = LoadValueWide(rl_src, kFPReg);
       src_reg = rl_src.reg.GetLowReg();
       // In case result vreg is also src vreg, break association to avoid useless copy by EvalLoc()
       ClobberSReg(rl_dest.s_reg_low);
       rl_result = EvalLoc(rl_dest, kCoreReg, true);
       int temp_reg = AllocTempDouble().GetLowReg() | X86_FP_DOUBLE;

       LoadConstant(rl_result.reg, 0x7fffffff);
       NewLIR2(kX86Cvtsi2sdRR, temp_reg, rl_result.reg.GetReg());
       NewLIR2(kX86ComisdRR, src_reg, temp_reg);
       LIR* branch_pos_overflow = NewLIR2(kX86Jcc8, 0, kX86CondA);
       LIR* branch_na_n = NewLIR2(kX86Jcc8, 0, kX86CondP);
       NewLIR2(kX86Cvttsd2siRR, rl_result.reg.GetReg(), src_reg);
       LIR* branch_normal = NewLIR1(kX86Jmp8, 0);
       branch_na_n->target = NewLIR0(kPseudoTargetLabel);
       NewLIR2(kX86Xor32RR, rl_result.reg.GetReg(), rl_result.reg.GetReg());
       branch_pos_overflow->target = NewLIR0(kPseudoTargetLabel);
       branch_normal->target = NewLIR0(kPseudoTargetLabel);
       StoreValue(rl_dest, rl_result);
       return;
     }
     case Instruction::LONG_TO_DOUBLE:
       GenLongToFP(rl_dest, rl_src, true /* is_double */);
       return;
     case Instruction::LONG_TO_FLOAT:
       GenLongToFP(rl_dest, rl_src, false /* is_double */);
       return;
     case Instruction::FLOAT_TO_LONG:
       GenConversionCall(QUICK_ENTRYPOINT_OFFSET(4, pF2l), rl_dest, rl_src);
       return;
     case Instruction::DOUBLE_TO_LONG:
       GenConversionCall(QUICK_ENTRYPOINT_OFFSET(4, pD2l), rl_dest, rl_src);
       return;
     default:
       LOG(INFO) << "Unexpected opcode: " << opcode;
   }
   if (rl_src.wide) {
     rl_src = LoadValueWide(rl_src, rcSrc);
     src_reg = S2d(rl_src.reg.GetLowReg(), rl_src.reg.GetHighReg());
   } else {
     rl_src = LoadValue(rl_src, rcSrc);
     src_reg = rl_src.reg.GetReg();
   }
   if (rl_dest.wide) {
     rl_result = EvalLoc(rl_dest, kFPReg, true);
     NewLIR2(op, S2d(rl_result.reg.GetLowReg(), rl_result.reg.GetHighReg()), src_reg);
     StoreValueWide(rl_dest, rl_result);
   } else {
     rl_result = EvalLoc(rl_dest, kFPReg, true);
     NewLIR2(op, rl_result.reg.GetReg(), src_reg);
     StoreValue(rl_dest, rl_result);
   }
 }

 void X86Mir2Lir::GenCmpFP(Instruction::Code code, RegLocation rl_dest,
                           RegLocation rl_src1, RegLocation rl_src2) {
   bool single = (code == Instruction::CMPL_FLOAT) || (code == Instruction::CMPG_FLOAT);
   bool unordered_gt = (code == Instruction::CMPG_DOUBLE) || (code == Instruction::CMPG_FLOAT);
   int src_reg1;
   int src_reg2;
   if (single) {
     rl_src1 = LoadValue(rl_src1, kFPReg);
     src_reg1 = rl_src1.reg.GetReg();
     rl_src2 = LoadValue(rl_src2, kFPReg);
     src_reg2 = rl_src2.reg.GetReg();
   } else {
     rl_src1 = LoadValueWide(rl_src1, kFPReg);
     src_reg1 = S2d(rl_src1.reg.GetLowReg(), rl_src1.reg.GetHighReg());
     rl_src2 = LoadValueWide(rl_src2, kFPReg);
     src_reg2 = S2d(rl_src2.reg.GetLowReg(), rl_src2.reg.GetHighReg());
   }
   // In case result vreg is also src vreg, break association to avoid useless copy by EvalLoc()
   ClobberSReg(rl_dest.s_reg_low);
   RegLocation rl_result = EvalLoc(rl_dest, kCoreReg, true);
   LoadConstantNoClobber(rl_result.reg, unordered_gt ? 1 : 0);
   if (single) {
     NewLIR2(kX86UcomissRR, src_reg1, src_reg2);
   } else {
     NewLIR2(kX86UcomisdRR, src_reg1, src_reg2);
   }
   LIR* branch = NULL;
   if (unordered_gt) {
     branch = NewLIR2(kX86Jcc8, 0, kX86CondPE);
   }
   // If the result reg can't be byte accessed, use a jump and move instead of a set.
   if (rl_result.reg.GetReg() >= 4) {
     LIR* branch2 = NULL;
     if (unordered_gt) {
       branch2 = NewLIR2(kX86Jcc8, 0, kX86CondA);
       NewLIR2(kX86Mov32RI, rl_result.reg.GetReg(), 0x0);
     } else {
       branch2 = NewLIR2(kX86Jcc8, 0, kX86CondBe);
       NewLIR2(kX86Mov32RI, rl_result.reg.GetReg(), 0x1);
     }
     branch2->target = NewLIR0(kPseudoTargetLabel);
   } else {
     NewLIR2(kX86Set8R, rl_result.reg.GetReg(), kX86CondA /* above - unsigned > */);
   }
   NewLIR2(kX86Sbb32RI, rl_result.reg.GetReg(), 0);
   if (unordered_gt) {
     branch->target = NewLIR0(kPseudoTargetLabel);
   }
   StoreValue(rl_dest, rl_result);
 }

 void X86Mir2Lir::GenFusedFPCmpBranch(BasicBlock* bb, MIR* mir, bool gt_bias,
                                      bool is_double) {
   LIR* taken = &block_label_list_[bb->taken];
   LIR* not_taken = &block_label_list_[bb->fall_through];
   LIR* branch = NULL;
   RegLocation rl_src1;
   RegLocation rl_src2;
   if (is_double) {
     rl_src1 = mir_graph_->GetSrcWide(mir, 0);
     rl_src2 = mir_graph_->GetSrcWide(mir, 2);
     rl_src1 = LoadValueWide(rl_src1, kFPReg);
     rl_src2 = LoadValueWide(rl_src2, kFPReg);
     NewLIR2(kX86UcomisdRR, S2d(rl_src1.reg.GetLowReg(), rl_src1.reg.GetHighReg()),
             S2d(rl_src2.reg.GetLowReg(), rl_src2.reg.GetHighReg()));
   } else {
     rl_src1 = mir_graph_->GetSrc(mir, 0);
     rl_src2 = mir_graph_->GetSrc(mir, 1);
     rl_src1 = LoadValue(rl_src1, kFPReg);
     rl_src2 = LoadValue(rl_src2, kFPReg);
     NewLIR2(kX86UcomissRR, rl_src1.reg.GetReg(), rl_src2.reg.GetReg());
   }
   ConditionCode ccode = mir->meta.ccode;
   switch (ccode) {
     case kCondEq:
       if (!gt_bias) {
         branch = NewLIR2(kX86Jcc8, 0, kX86CondPE);
         branch->target = not_taken;
       }
       break;
     case kCondNe:
       if (!gt_bias) {
         branch = NewLIR2(kX86Jcc8, 0, kX86CondPE);
         branch->target = taken;
       }
       break;
     case kCondLt:
       if (gt_bias) {
         branch = NewLIR2(kX86Jcc8, 0, kX86CondPE);
         branch->target = not_taken;
       }
       ccode = kCondUlt;
       break;
     case kCondLe:
       if (gt_bias) {
         branch = NewLIR2(kX86Jcc8, 0, kX86CondPE);
         branch->target = not_taken;
       }
       ccode = kCondLs;
       break;
     case kCondGt:
       if (gt_bias) {
         branch = NewLIR2(kX86Jcc8, 0, kX86CondPE);
         branch->target = taken;
       }
       ccode = kCondHi;
       break;
     case kCondGe:
       if (gt_bias) {
         branch = NewLIR2(kX86Jcc8, 0, kX86CondPE);
         branch->target = taken;
       }
       ccode = kCondUge;
       break;
     default:
       LOG(FATAL) << "Unexpected ccode: " << ccode;
   }
   OpCondBranch(ccode, taken);
 }

 void X86Mir2Lir::GenNegFloat(RegLocation rl_dest, RegLocation rl_src) {
   RegLocation rl_result;
   rl_src = LoadValue(rl_src, kCoreReg);
   rl_result = EvalLoc(rl_dest, kCoreReg, true);
   OpRegRegImm(kOpAdd, rl_result.reg, rl_src.reg, 0x80000000);
   StoreValue(rl_dest, rl_result);
 }

 void X86Mir2Lir::GenNegDouble(RegLocation rl_dest, RegLocation rl_src) {
   RegLocation rl_result;
   rl_src = LoadValueWide(rl_src, kCoreReg);
   rl_result = EvalLoc(rl_dest, kCoreReg, true);
   OpRegRegImm(kOpAdd, rl_result.reg.GetHigh(), rl_src.reg.GetHigh(), 0x80000000);
   OpRegCopy(rl_result.reg, rl_src.reg);
   StoreValueWide(rl_dest, rl_result);
 }

 bool X86Mir2Lir::GenInlinedSqrt(CallInfo* info) {
   RegLocation rl_src = info->args[0];
   RegLocation rl_dest = InlineTargetWide(info);  // double place for result
   rl_src = LoadValueWide(rl_src, kFPReg);
   RegLocation rl_result = EvalLoc(rl_dest, kFPReg, true);
   NewLIR2(kX86SqrtsdRR, S2d(rl_result.reg.GetLowReg(), rl_result.reg.GetHighReg()),
           S2d(rl_src.reg.GetLowReg(), rl_src.reg.GetHighReg()));
   StoreValueWide(rl_dest, rl_result);
   return true;
 }


 }  // namespace art
	/*
	* Copyright (C) 2012 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "codegen_x86.h"
	#include "dex/quick/mir_to_lir-inl.h"
	#include "x86_lir.h"

	namespace art {

	void X86Mir2Lir::GenArithOpFloat(Instruction::Code opcode,
	RegLocation rl_dest, RegLocation rl_src1, RegLocation rl_src2) {
	X86OpCode op = kX86Nop;
	RegLocation rl_result;

	/*
	* Don't attempt to optimize register usage since these opcodes call out to
	* the handlers.
	*/
	switch (opcode) {
	case Instruction::ADD_FLOAT_2ADDR:
	case Instruction::ADD_FLOAT:
	op = kX86AddssRR;
	break;
	case Instruction::SUB_FLOAT_2ADDR:
	case Instruction::SUB_FLOAT:
	op = kX86SubssRR;
	break;
	case Instruction::DIV_FLOAT_2ADDR:
	case Instruction::DIV_FLOAT:
	op = kX86DivssRR;
	break;
	case Instruction::MUL_FLOAT_2ADDR:
	case Instruction::MUL_FLOAT:
	op = kX86MulssRR;
	break;
	case Instruction::REM_FLOAT_2ADDR:
	case Instruction::REM_FLOAT:
	FlushAllRegs(); // Send everything to home location
	CallRuntimeHelperRegLocationRegLocation(QUICK_ENTRYPOINT_OFFSET(4, pFmodf), rl_src1, rl_src2,
	false);
	rl_result = GetReturn(true);
	StoreValue(rl_dest, rl_result);
	return;
	case Instruction::NEG_FLOAT:
	GenNegFloat(rl_dest, rl_src1);
	return;
	default:
	LOG(FATAL) << "Unexpected opcode: " << opcode;
	}
	rl_src1 = LoadValue(rl_src1, kFPReg);
	rl_src2 = LoadValue(rl_src2, kFPReg);
	rl_result = EvalLoc(rl_dest, kFPReg, true);
	RegStorage r_dest = rl_result.reg;
	RegStorage r_src1 = rl_src1.reg;
	RegStorage r_src2 = rl_src2.reg;
	if (r_dest == r_src2) {
	r_src2 = AllocTempFloat();
	OpRegCopy(r_src2, r_dest);
	}
	OpRegCopy(r_dest, r_src1);
	NewLIR2(op, r_dest.GetReg(), r_src2.GetReg());
	StoreValue(rl_dest, rl_result);
	}

	void X86Mir2Lir::GenArithOpDouble(Instruction::Code opcode,
	RegLocation rl_dest, RegLocation rl_src1, RegLocation rl_src2) {
	X86OpCode op = kX86Nop;
	RegLocation rl_result;

	switch (opcode) {
	case Instruction::ADD_DOUBLE_2ADDR:
	case Instruction::ADD_DOUBLE:
	op = kX86AddsdRR;
	break;
	case Instruction::SUB_DOUBLE_2ADDR:
	case Instruction::SUB_DOUBLE:
	op = kX86SubsdRR;
	break;
	case Instruction::DIV_DOUBLE_2ADDR:
	case Instruction::DIV_DOUBLE:
	op = kX86DivsdRR;
	break;
	case Instruction::MUL_DOUBLE_2ADDR:
	case Instruction::MUL_DOUBLE:
	op = kX86MulsdRR;
	break;
	case Instruction::REM_DOUBLE_2ADDR:
	case Instruction::REM_DOUBLE:
	FlushAllRegs(); // Send everything to home location
	CallRuntimeHelperRegLocationRegLocation(QUICK_ENTRYPOINT_OFFSET(4, pFmod), rl_src1, rl_src2,
	false);
	rl_result = GetReturnWide(true);
	StoreValueWide(rl_dest, rl_result);
	return;
	case Instruction::NEG_DOUBLE:
	GenNegDouble(rl_dest, rl_src1);
	return;
	default:
	LOG(FATAL) << "Unexpected opcode: " << opcode;
	}
	rl_src1 = LoadValueWide(rl_src1, kFPReg);
	DCHECK(rl_src1.wide);
	rl_src2 = LoadValueWide(rl_src2, kFPReg);
	DCHECK(rl_src2.wide);
	rl_result = EvalLoc(rl_dest, kFPReg, true);
	DCHECK(rl_dest.wide);
	DCHECK(rl_result.wide);
	// TODO: update with direct 64-bit reg.
	int r_dest = S2d(rl_result.reg.GetLowReg(), rl_result.reg.GetHighReg());
	int r_src1 = S2d(rl_src1.reg.GetLowReg(), rl_src1.reg.GetHighReg());
	int r_src2 = S2d(rl_src2.reg.GetLowReg(), rl_src2.reg.GetHighReg());
	if (r_dest == r_src2) {
	r_src2 = AllocTempDouble().GetLowReg() \| X86_FP_DOUBLE;
	OpRegCopy(RegStorage::Solo64(r_src2), RegStorage::Solo64(r_dest));
	}
	OpRegCopy(RegStorage::Solo64(r_dest), RegStorage::Solo64(r_src1));
	NewLIR2(op, r_dest, r_src2);
	StoreValueWide(rl_dest, rl_result);
	}

	void X86Mir2Lir::GenLongToFP(RegLocation rl_dest, RegLocation rl_src, bool is_double) {
	// Compute offsets to the source and destination VRs on stack
	int src_v_reg_offset = SRegOffset(rl_src.s_reg_low);
	int dest_v_reg_offset = SRegOffset(rl_dest.s_reg_low);

	// Update the in-register state of source.
	rl_src = UpdateLocWide(rl_src);

	// If the source is in physical register, then put it in its location on stack.
	if (rl_src.location == kLocPhysReg) {
	RegisterInfo* lo_info = GetRegInfo(rl_src.reg.GetLowReg());

	if (lo_info != nullptr && lo_info->is_temp) {
	// Calling FlushSpecificReg because it will only write back VR if it is dirty.
	FlushSpecificReg(lo_info);
	// ResetDef for low/high to prevent NullifyRange from removing stores.
	ResetDef(rl_src.reg.GetLowReg());
	if (rl_src.reg.GetLowReg() != rl_src.reg.GetHighReg() && GetRegInfo(rl_src.reg.GetHighReg()) != nullptr) {
	ResetDef(rl_src.reg.GetHighReg());
	}
	} else {
	// It must have been register promoted if it is not a temp but is still in physical
	// register. Since we need it to be in memory to convert, we place it there now.
	StoreBaseDispWide(TargetReg(kSp), src_v_reg_offset, rl_src.reg);
	}
	}

	// Push the source virtual register onto the x87 stack.
	LIR *fild64 = NewLIR2NoDest(kX86Fild64M, TargetReg(kSp).GetReg(), src_v_reg_offset + LOWORD_OFFSET);
	AnnotateDalvikRegAccess(fild64, (src_v_reg_offset + LOWORD_OFFSET) >> 2,
	true /* is_load /, true / is64bit */);

	// Now pop off x87 stack and store it in the destination VR's stack location.
	int opcode = is_double ? kX86Fstp64M : kX86Fstp32M;
	int displacement = is_double ? dest_v_reg_offset + LOWORD_OFFSET : dest_v_reg_offset;
	LIR *fstp = NewLIR2NoDest(opcode, TargetReg(kSp).GetReg(), displacement);
	AnnotateDalvikRegAccess(fstp, displacement >> 2, false /* is_load */, is_double);

	/*
	* The result is in a physical register if it was in a temp or was register
	* promoted. For that reason it is enough to check if it is in physical
	* register. If it is, then we must do all of the bookkeeping necessary to
	* invalidate temp (if needed) and load in promoted register (if needed).
	* If the result's location is in memory, then we do not need to do anything
	* more since the fstp has already placed the correct value in memory.
	*/
	RegLocation rl_result = is_double ? UpdateLocWide(rl_dest) : UpdateLoc(rl_dest);
	if (rl_result.location == kLocPhysReg) {
	/*
	* We already know that the result is in a physical register but do not know if it is the
	* right class. So we call EvalLoc(Wide) first which will ensure that it will get moved to the
	* correct register class.
	*/
	if (is_double) {
	rl_result = EvalLocWide(rl_dest, kFPReg, true);

	LoadBaseDispWide(TargetReg(kSp), dest_v_reg_offset, rl_result.reg, INVALID_SREG);

	StoreFinalValueWide(rl_dest, rl_result);
	} else {
	rl_result = EvalLoc(rl_dest, kFPReg, true);

	Load32Disp(TargetReg(kSp), dest_v_reg_offset, rl_result.reg);

	StoreFinalValue(rl_dest, rl_result);
	}
	}
	}

	void X86Mir2Lir::GenConversion(Instruction::Code opcode, RegLocation rl_dest,
	RegLocation rl_src) {
	RegisterClass rcSrc = kFPReg;
	X86OpCode op = kX86Nop;
	int src_reg;
	RegLocation rl_result;
	switch (opcode) {
	case Instruction::INT_TO_FLOAT:
	rcSrc = kCoreReg;
	op = kX86Cvtsi2ssRR;
	break;
	case Instruction::DOUBLE_TO_FLOAT:
	rcSrc = kFPReg;
	op = kX86Cvtsd2ssRR;
	break;
	case Instruction::FLOAT_TO_DOUBLE:
	rcSrc = kFPReg;
	op = kX86Cvtss2sdRR;
	break;
	case Instruction::INT_TO_DOUBLE:
	rcSrc = kCoreReg;
	op = kX86Cvtsi2sdRR;
	break;
	case Instruction::FLOAT_TO_INT: {
	rl_src = LoadValue(rl_src, kFPReg);
	src_reg = rl_src.reg.GetReg();
	// In case result vreg is also src vreg, break association to avoid useless copy by EvalLoc()
	ClobberSReg(rl_dest.s_reg_low);
	rl_result = EvalLoc(rl_dest, kCoreReg, true);
	int temp_reg = AllocTempFloat().GetReg();

	LoadConstant(rl_result.reg, 0x7fffffff);
	NewLIR2(kX86Cvtsi2ssRR, temp_reg, rl_result.reg.GetReg());
	NewLIR2(kX86ComissRR, src_reg, temp_reg);
	LIR* branch_pos_overflow = NewLIR2(kX86Jcc8, 0, kX86CondA);
	LIR* branch_na_n = NewLIR2(kX86Jcc8, 0, kX86CondP);
	NewLIR2(kX86Cvttss2siRR, rl_result.reg.GetReg(), src_reg);
	LIR* branch_normal = NewLIR1(kX86Jmp8, 0);
	branch_na_n->target = NewLIR0(kPseudoTargetLabel);
	NewLIR2(kX86Xor32RR, rl_result.reg.GetReg(), rl_result.reg.GetReg());
	branch_pos_overflow->target = NewLIR0(kPseudoTargetLabel);
	branch_normal->target = NewLIR0(kPseudoTargetLabel);
	StoreValue(rl_dest, rl_result);
	return;
	}
	case Instruction::DOUBLE_TO_INT: {
	rl_src = LoadValueWide(rl_src, kFPReg);
	src_reg = rl_src.reg.GetLowReg();
	// In case result vreg is also src vreg, break association to avoid useless copy by EvalLoc()
	ClobberSReg(rl_dest.s_reg_low);
	rl_result = EvalLoc(rl_dest, kCoreReg, true);
	int temp_reg = AllocTempDouble().GetLowReg() \| X86_FP_DOUBLE;

	LoadConstant(rl_result.reg, 0x7fffffff);
	NewLIR2(kX86Cvtsi2sdRR, temp_reg, rl_result.reg.GetReg());
	NewLIR2(kX86ComisdRR, src_reg, temp_reg);
	LIR* branch_pos_overflow = NewLIR2(kX86Jcc8, 0, kX86CondA);
	LIR* branch_na_n = NewLIR2(kX86Jcc8, 0, kX86CondP);
	NewLIR2(kX86Cvttsd2siRR, rl_result.reg.GetReg(), src_reg);
	LIR* branch_normal = NewLIR1(kX86Jmp8, 0);
	branch_na_n->target = NewLIR0(kPseudoTargetLabel);
	NewLIR2(kX86Xor32RR, rl_result.reg.GetReg(), rl_result.reg.GetReg());
	branch_pos_overflow->target = NewLIR0(kPseudoTargetLabel);
	branch_normal->target = NewLIR0(kPseudoTargetLabel);
	StoreValue(rl_dest, rl_result);
	return;
	}
	case Instruction::LONG_TO_DOUBLE:
	GenLongToFP(rl_dest, rl_src, true /* is_double */);
	return;
	case Instruction::LONG_TO_FLOAT:
	GenLongToFP(rl_dest, rl_src, false /* is_double */);
	return;
	case Instruction::FLOAT_TO_LONG:
	GenConversionCall(QUICK_ENTRYPOINT_OFFSET(4, pF2l), rl_dest, rl_src);
	return;
	case Instruction::DOUBLE_TO_LONG:
	GenConversionCall(QUICK_ENTRYPOINT_OFFSET(4, pD2l), rl_dest, rl_src);
	return;
	default:
	LOG(INFO) << "Unexpected opcode: " << opcode;
	}
	if (rl_src.wide) {
	rl_src = LoadValueWide(rl_src, rcSrc);
	src_reg = S2d(rl_src.reg.GetLowReg(), rl_src.reg.GetHighReg());
	} else {
	rl_src = LoadValue(rl_src, rcSrc);
	src_reg = rl_src.reg.GetReg();
	}
	if (rl_dest.wide) {
	rl_result = EvalLoc(rl_dest, kFPReg, true);
	NewLIR2(op, S2d(rl_result.reg.GetLowReg(), rl_result.reg.GetHighReg()), src_reg);
	StoreValueWide(rl_dest, rl_result);
	} else {
	rl_result = EvalLoc(rl_dest, kFPReg, true);
	NewLIR2(op, rl_result.reg.GetReg(), src_reg);
	StoreValue(rl_dest, rl_result);
	}
	}

	void X86Mir2Lir::GenCmpFP(Instruction::Code code, RegLocation rl_dest,
	RegLocation rl_src1, RegLocation rl_src2) {
	bool single = (code == Instruction::CMPL_FLOAT) \|\| (code == Instruction::CMPG_FLOAT);
	bool unordered_gt = (code == Instruction::CMPG_DOUBLE) \|\| (code == Instruction::CMPG_FLOAT);
	int src_reg1;
	int src_reg2;
	if (single) {
	rl_src1 = LoadValue(rl_src1, kFPReg);
	src_reg1 = rl_src1.reg.GetReg();
	rl_src2 = LoadValue(rl_src2, kFPReg);
	src_reg2 = rl_src2.reg.GetReg();
	} else {
	rl_src1 = LoadValueWide(rl_src1, kFPReg);
	src_reg1 = S2d(rl_src1.reg.GetLowReg(), rl_src1.reg.GetHighReg());
	rl_src2 = LoadValueWide(rl_src2, kFPReg);
	src_reg2 = S2d(rl_src2.reg.GetLowReg(), rl_src2.reg.GetHighReg());
	}
	// In case result vreg is also src vreg, break association to avoid useless copy by EvalLoc()
	ClobberSReg(rl_dest.s_reg_low);
	RegLocation rl_result = EvalLoc(rl_dest, kCoreReg, true);
	LoadConstantNoClobber(rl_result.reg, unordered_gt ? 1 : 0);
	if (single) {
	NewLIR2(kX86UcomissRR, src_reg1, src_reg2);
	} else {
	NewLIR2(kX86UcomisdRR, src_reg1, src_reg2);
	}
	LIR* branch = NULL;
	if (unordered_gt) {
	branch = NewLIR2(kX86Jcc8, 0, kX86CondPE);
	}
	// If the result reg can't be byte accessed, use a jump and move instead of a set.
	if (rl_result.reg.GetReg() >= 4) {
	LIR* branch2 = NULL;
	if (unordered_gt) {
	branch2 = NewLIR2(kX86Jcc8, 0, kX86CondA);
	NewLIR2(kX86Mov32RI, rl_result.reg.GetReg(), 0x0);
	} else {
	branch2 = NewLIR2(kX86Jcc8, 0, kX86CondBe);
	NewLIR2(kX86Mov32RI, rl_result.reg.GetReg(), 0x1);
	}
	branch2->target = NewLIR0(kPseudoTargetLabel);
	} else {
	NewLIR2(kX86Set8R, rl_result.reg.GetReg(), kX86CondA /* above - unsigned > */);
	}
	NewLIR2(kX86Sbb32RI, rl_result.reg.GetReg(), 0);
	if (unordered_gt) {
	branch->target = NewLIR0(kPseudoTargetLabel);
	}
	StoreValue(rl_dest, rl_result);
	}

	void X86Mir2Lir::GenFusedFPCmpBranch(BasicBlock* bb, MIR* mir, bool gt_bias,
	bool is_double) {
	LIR* taken = &block_label_list_[bb->taken];
	LIR* not_taken = &block_label_list_[bb->fall_through];
	LIR* branch = NULL;
	RegLocation rl_src1;
	RegLocation rl_src2;
	if (is_double) {
	rl_src1 = mir_graph_->GetSrcWide(mir, 0);
	rl_src2 = mir_graph_->GetSrcWide(mir, 2);
	rl_src1 = LoadValueWide(rl_src1, kFPReg);
	rl_src2 = LoadValueWide(rl_src2, kFPReg);
	NewLIR2(kX86UcomisdRR, S2d(rl_src1.reg.GetLowReg(), rl_src1.reg.GetHighReg()),
	S2d(rl_src2.reg.GetLowReg(), rl_src2.reg.GetHighReg()));
	} else {
	rl_src1 = mir_graph_->GetSrc(mir, 0);
	rl_src2 = mir_graph_->GetSrc(mir, 1);
	rl_src1 = LoadValue(rl_src1, kFPReg);
	rl_src2 = LoadValue(rl_src2, kFPReg);
	NewLIR2(kX86UcomissRR, rl_src1.reg.GetReg(), rl_src2.reg.GetReg());
	}
	ConditionCode ccode = mir->meta.ccode;
	switch (ccode) {
	case kCondEq:
	if (!gt_bias) {
	branch = NewLIR2(kX86Jcc8, 0, kX86CondPE);
	branch->target = not_taken;
	}
	break;
	case kCondNe:
	if (!gt_bias) {
	branch = NewLIR2(kX86Jcc8, 0, kX86CondPE);
	branch->target = taken;
	}
	break;
	case kCondLt:
	if (gt_bias) {
	branch = NewLIR2(kX86Jcc8, 0, kX86CondPE);
	branch->target = not_taken;
	}
	ccode = kCondUlt;
	break;
	case kCondLe:
	if (gt_bias) {
	branch = NewLIR2(kX86Jcc8, 0, kX86CondPE);
	branch->target = not_taken;
	}
	ccode = kCondLs;
	break;
	case kCondGt:
	if (gt_bias) {
	branch = NewLIR2(kX86Jcc8, 0, kX86CondPE);
	branch->target = taken;
	}
	ccode = kCondHi;
	break;
	case kCondGe:
	if (gt_bias) {
	branch = NewLIR2(kX86Jcc8, 0, kX86CondPE);
	branch->target = taken;
	}
	ccode = kCondUge;
	break;
	default:
	LOG(FATAL) << "Unexpected ccode: " << ccode;
	}
	OpCondBranch(ccode, taken);
	}

	void X86Mir2Lir::GenNegFloat(RegLocation rl_dest, RegLocation rl_src) {
	RegLocation rl_result;
	rl_src = LoadValue(rl_src, kCoreReg);
	rl_result = EvalLoc(rl_dest, kCoreReg, true);
	OpRegRegImm(kOpAdd, rl_result.reg, rl_src.reg, 0x80000000);
	StoreValue(rl_dest, rl_result);
	}

	void X86Mir2Lir::GenNegDouble(RegLocation rl_dest, RegLocation rl_src) {
	RegLocation rl_result;
	rl_src = LoadValueWide(rl_src, kCoreReg);
	rl_result = EvalLoc(rl_dest, kCoreReg, true);
	OpRegRegImm(kOpAdd, rl_result.reg.GetHigh(), rl_src.reg.GetHigh(), 0x80000000);
	OpRegCopy(rl_result.reg, rl_src.reg);
	StoreValueWide(rl_dest, rl_result);
	}

	bool X86Mir2Lir::GenInlinedSqrt(CallInfo* info) {
	RegLocation rl_src = info->args[0];
	RegLocation rl_dest = InlineTargetWide(info); // double place for result
	rl_src = LoadValueWide(rl_src, kFPReg);
	RegLocation rl_result = EvalLoc(rl_dest, kFPReg, true);
	NewLIR2(kX86SqrtsdRR, S2d(rl_result.reg.GetLowReg(), rl_result.reg.GetHighReg()),
	S2d(rl_src.reg.GetLowReg(), rl_src.reg.GetHighReg()));
	StoreValueWide(rl_dest, rl_result);
	return true;
	}



	} // namespace art