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emit_x64_data_processing: EmitSub: Use cmp where possible

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This commit is contained in:
MerryMage 2021-01-01 19:37:47 +00:00
parent e926f0b393
commit 8c4463a0c1
2 changed files with 17 additions and 7 deletions
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4
src/frontend/A64/translate/impl/data_processing_conditional_compare.cpp
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@ -27,7 +27,7 @@ bool TranslatorVisitor::CCMP_reg(bool sf, Reg Rm, Cond cond, Reg Rn, Imm<4> nzcv
const IR::U32U64 operand1 = X(datasize, Rn);
const IR::U32U64 operand2 = X(datasize, Rm);
const IR::NZCV then_flags = ir.NZCVFrom(ir.AddWithCarry(operand1, ir.Not(operand2), ir.Imm1(1)));
const IR::NZCV then_flags = ir.NZCVFrom(ir.SubWithCarry(operand1, operand2, ir.Imm1(1)));
const IR::NZCV else_flags = ir.NZCVFromPackedFlags(ir.Imm32(flags));
ir.SetNZCV(ir.ConditionalSelect(cond, then_flags, else_flags));
return true;
@ -53,7 +53,7 @@ bool TranslatorVisitor::CCMP_imm(bool sf, Imm<5> imm5, Cond cond, Reg Rn, Imm<4>
const IR::U32U64 operand1 = X(datasize, Rn);
const IR::U32U64 operand2 = I(datasize, imm5.ZeroExtend<u32>());
const IR::NZCV then_flags = ir.NZCVFrom(ir.AddWithCarry(operand1, ir.Not(operand2), ir.Imm1(1)));
const IR::NZCV then_flags = ir.NZCVFrom(ir.SubWithCarry(operand1, operand2, ir.Imm1(1)));
const IR::NZCV else_flags = ir.NZCVFromPackedFlags(ir.Imm32(flags));
ir.SetNZCV(ir.ConditionalSelect(cond, then_flags, else_flags));
return true;