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Frontend: Improve DecodeInst size from 128 bytes to 80

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We were paying a large cost per Literal type that we can special case
for the two class of instructions that use a 64-bit literal.

If we packed this would get to a further 62 bytes but probably not worth
it.
This commit is contained in:
Ryan Houdek committed 2025-09-12 16:07:01 -07:00
1 parent 90ea16325a
commit 3fa400bc55
5 files changed
+75 -17
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FEXCore/Source/Interface/Core/Frontend.cpp
+11 -2
View File
@@ -634,11 +634,20 @@ bool Decoder::NormalOp(const FEXCore::X86Tables::X86InstInfo* Info, uint16_t Op,
Literal = static_cast<int32_t>(Literal);
}
DecodeInst->Src[CurrentSrc].Data.Literal.Size = DestSize;
DecodeInst->Src[CurrentSrc].Data.Literal.SignExtend = true;
}
DecodeInst->Src[CurrentSrc].Type = DecodedOperand::OpType::Literal;
DecodeInst->Src[CurrentSrc].Data.Literal.Value = Literal;
++CurrentSrc;
if (Bytes == 8) [[unlikely]] {
DecodeInst->Src[CurrentSrc].Data.Literal.Size = 4;
DecodeInst->Src[CurrentSrc].Type = DecodedOperand::OpType::Literal;
DecodeInst->Src[CurrentSrc].Data.Literal.Value = Literal >> 32;
}
Bytes = 0;
DecodeInst->Src[CurrentSrc].Type = DecodedOperand::OpType::Literal;
DecodeInst->Src[CurrentSrc].Data.Literal.Value = Literal;
}
LOGMAN_THROW_A_FMT(Bytes == 0, "Inst at 0x{:x}: 0x{:04x} '{}' Had an instruction of size {} with {} remaining", DecodeInst->PC,