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emit_x64_data_processing: Reduce codesize of RotateRight32 for carry case

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MerryMage 2021-04-26 21:57:22 +01:00
parent f77b98de36
commit 68088c277c
1 changed files with 3 additions and 15 deletions
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18
src/backend/x64/emit_x64_data_processing.cpp
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@ -745,28 +745,16 @@ void EmitX64::EmitRotateRight32(EmitContext& ctx, IR::Inst* inst) {
const Xbyak::Reg32 result = ctx.reg_alloc.UseScratchGpr(operand_arg).cvt32(); const Xbyak::Reg32 result = ctx.reg_alloc.UseScratchGpr(operand_arg).cvt32();
const Xbyak::Reg8 carry = ctx.reg_alloc.UseScratchGpr(carry_arg).cvt8(); const Xbyak::Reg8 carry = ctx.reg_alloc.UseScratchGpr(carry_arg).cvt8();
// TODO: Optimize Xbyak::Label end;
code.inLocalLabel();
// if (Rs & 0xFF == 0) goto end;
code.test(code.cl, code.cl); code.test(code.cl, code.cl);
code.jz(".end"); code.jz(end);
code.and_(code.ecx, u32(0x1F));
code.jz(".zero_1F");
// if (Rs & 0x1F != 0) {
code.ror(result, code.cl); code.ror(result, code.cl);
code.setc(carry);
code.jmp(".end");
// } else {
code.L(".zero_1F");
code.bt(result, u8(31)); code.bt(result, u8(31));
code.setc(carry); code.setc(carry);
// }
code.L(".end");
code.outLocalLabel(); code.L(end);
ctx.reg_alloc.DefineValue(carry_inst, carry); ctx.reg_alloc.DefineValue(carry_inst, carry);
ctx.EraseInstruction(carry_inst); ctx.EraseInstruction(carry_inst);