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BackendX64/EmitX64: Reduce number of MOVs by using reg_alloc.{RegisterAddDef,UseDefOpArg,UseOpArg}

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This commit is contained in:
MerryMage 2016-08-05 14:11:27 +01:00
parent 92bd5f214b
commit 94e75ad32f
1 changed files with 26 additions and 35 deletions
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61
src/backend_x64/emit_x64.cpp
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@ -92,8 +92,9 @@ void EmitX64::EmitBreakpoint(IR::Block&, IR::Inst*) {
}
void EmitX64::EmitIdentity(IR::Block& block, IR::Inst* inst) {
// TODO: Possible unnecessary mov here.
reg_alloc.UseDefRegister(inst->GetArg(0), inst, any_gpr);
if (!inst->GetArg(0).IsImmediate()) {
reg_alloc.RegisterAddDef(inst, inst->GetArg(0));
}
}
void EmitX64::EmitGetRegister(IR::Block&, IR::Inst* inst) {
@ -276,15 +277,11 @@ void EmitX64::EmitGetOverflowFromOp(IR::Block&, IR::Inst*) {
}
void EmitX64::EmitLeastSignificantHalf(IR::Block&, IR::Inst* inst) {
// TODO: Optimize
reg_alloc.UseDefRegister(inst->GetArg(0), inst, any_gpr);
reg_alloc.RegisterAddDef(inst, inst->GetArg(0));
}
void EmitX64::EmitLeastSignificantByte(IR::Block&, IR::Inst* inst) {
// TODO: Optimize
reg_alloc.UseDefRegister(inst->GetArg(0), inst, any_gpr);
reg_alloc.RegisterAddDef(inst, inst->GetArg(0));
}
void EmitX64::EmitMostSignificantBit(IR::Block&, IR::Inst* inst) {
@ -681,9 +678,7 @@ void EmitX64::EmitAddWithCarry(IR::Block& block, IR::Inst* inst) {
// TODO: Consider using LEA.
OpArg op_arg = b.IsImmediate()
? Imm32(b.GetU32())
: R(reg_alloc.UseRegister(b.GetInst(), any_gpr));
OpArg op_arg = reg_alloc.UseOpArg(b, any_gpr);
if (carry_in.IsImmediate()) {
if (carry_in.GetU1()) {
@ -725,9 +720,7 @@ void EmitX64::EmitSubWithCarry(IR::Block& block, IR::Inst* inst) {
// TODO: Optimize CMP case.
// Note that x64 CF is inverse of what the ARM carry flag is here.
OpArg op_arg = b.IsImmediate()
? Imm32(b.GetU32())
: R(reg_alloc.UseRegister(b.GetInst(), any_gpr));
OpArg op_arg = reg_alloc.UseOpArg(b, any_gpr);
if (carry_in.IsImmediate()) {
if (carry_in.GetU1()) {
@ -759,9 +752,7 @@ void EmitX64::EmitAnd(IR::Block&, IR::Inst* inst) {
IR::Value b = inst->GetArg(1);
X64Reg result = reg_alloc.UseDefRegister(a, inst, any_gpr);
OpArg op_arg = b.IsImmediate()
? Imm32(b.GetU32())
: R(reg_alloc.UseRegister(b.GetInst(), any_gpr));
OpArg op_arg = reg_alloc.UseOpArg(b, any_gpr);
code->AND(32, R(result), op_arg);
}
@ -771,9 +762,7 @@ void EmitX64::EmitEor(IR::Block&, IR::Inst* inst) {
IR::Value b = inst->GetArg(1);
X64Reg result = reg_alloc.UseDefRegister(a, inst, any_gpr);
OpArg op_arg = b.IsImmediate()
? Imm32(b.GetU32())
: R(reg_alloc.UseRegister(b.GetInst(), any_gpr));
OpArg op_arg = reg_alloc.UseOpArg(b, any_gpr);
code->XOR(32, R(result), op_arg);
}
@ -783,9 +772,7 @@ void EmitX64::EmitOr(IR::Block&, IR::Inst* inst) {
IR::Value b = inst->GetArg(1);
X64Reg result = reg_alloc.UseDefRegister(a, inst, any_gpr);
OpArg op_arg = b.IsImmediate()
? Imm32(b.GetU32())
: R(reg_alloc.UseRegister(b.GetInst(), any_gpr));
OpArg op_arg = reg_alloc.UseOpArg(b, any_gpr);
code->OR(32, R(result), op_arg);
}
@ -805,31 +792,35 @@ void EmitX64::EmitNot(IR::Block&, IR::Inst* inst) {
}
void EmitX64::EmitSignExtendHalfToWord(IR::Block&, IR::Inst* inst) {
// TODO: Remove unnecessary mov that may occur here
X64Reg result = reg_alloc.UseDefRegister(inst->GetArg(0), inst, any_gpr);
OpArg source;
X64Reg result;
std::tie(source, result) = reg_alloc.UseDefOpArg(inst->GetArg(0), inst, any_gpr);
code->MOVSX(32, 16, result, R(result));
code->MOVSX(32, 16, result, source);
}
void EmitX64::EmitSignExtendByteToWord(IR::Block&, IR::Inst* inst) {
// TODO: Remove unnecessary mov that may occur here
X64Reg result = reg_alloc.UseDefRegister(inst->GetArg(0), inst, any_gpr);
OpArg source;
X64Reg result;
std::tie(source, result) = reg_alloc.UseDefOpArg(inst->GetArg(0), inst, any_gpr);
code->MOVSX(32, 8, result, R(result));
code->MOVSX(32, 8, result, source);
}
void EmitX64::EmitZeroExtendHalfToWord(IR::Block&, IR::Inst* inst) {
// TODO: Remove unnecessary mov that may occur here
X64Reg result = reg_alloc.UseDefRegister(inst->GetArg(0), inst, any_gpr);
OpArg source;
X64Reg result;
std::tie(source, result) = reg_alloc.UseDefOpArg(inst->GetArg(0), inst, any_gpr);
code->MOVZX(32, 16, result, R(result));
code->MOVZX(32, 16, result, source);
}
void EmitX64::EmitZeroExtendByteToWord(IR::Block&, IR::Inst* inst) {
// TODO: Remove unnecessary mov that may occur here
X64Reg result = reg_alloc.UseDefRegister(inst->GetArg(0), inst, any_gpr);
OpArg source;
X64Reg result;
std::tie(source, result) = reg_alloc.UseDefOpArg(inst->GetArg(0), inst, any_gpr);
code->MOVZX(32, 8, result, R(result));
code->MOVZX(32, 8, result, source);
}
void EmitX64::EmitByteReverseWord(IR::Block&, IR::Inst* inst) {