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emit_arm64_data_processing: EmitAddSub: Handle zero immediate w/ flag output

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Merry 2022-07-30 12:32:11 +01:00 committed by merry
parent cd537dc711
commit 0692f1d40e
1 changed files with 10 additions and 2 deletions
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12
src/dynarmic/backend/arm64/emit_arm64_data_processing.cpp
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@ -713,8 +713,16 @@ static void EmitAddSub(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst*
RegAlloc::Realize(Rresult, Ra); RegAlloc::Realize(Rresult, Ra);
ctx.reg_alloc.ReadWriteFlags(args[2], nzcv_inst); ctx.reg_alloc.ReadWriteFlags(args[2], nzcv_inst);
code.MOV(Rscratch0<bitsize>(), imm); if (imm == 0) {
sub ? code.SBCS(Rresult, Ra, Rscratch0<bitsize>()) : code.ADCS(Rresult, Ra, Rscratch0<bitsize>()); if constexpr (bitsize == 32) {
sub ? code.SBCS(Rresult, Ra, WZR) : code.ADCS(Rresult, Ra, WZR);
} else {
sub ? code.SBCS(Rresult, Ra, XZR) : code.ADCS(Rresult, Ra, XZR);
}
} else {
code.MOV(Rscratch0<bitsize>(), imm);
sub ? code.SBCS(Rresult, Ra, Rscratch0<bitsize>()) : code.ADCS(Rresult, Ra, Rscratch0<bitsize>());
}
} }
} else { } else {
auto Rb = ctx.reg_alloc.ReadReg<bitsize>(args[1]); auto Rb = ctx.reg_alloc.ReadReg<bitsize>(args[1]);