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Frontend: Expose AVX W flag

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Previously we could always tell the size of the operation depending on
how this effects the operating size of the instruction. Converting
64-bit down to 32-bit as an example.

AVX gather instructions are the first instruction class that can't infer
this information. The element load size is determined by the W flag but
the operating size of 128-bit or 256-bit is determined by other means.

Expose this flag so we can determine this difference. The FMA
instructions are going to need this flag as well.
This commit is contained in:
Ryan Houdek 2024-06-21 10:51:04 -07:00
parent 2da1e90dd5
commit bb308899b9
No known key found for this signature in database
2 changed files with 4 additions and 1 deletions
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3
FEXCore/Source/Interface/Core/Frontend.cpp
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@ -659,6 +659,9 @@ bool Decoder::NormalOpHeader(const FEXCore::X86Tables::X86InstInfo* Info, uint16
if (CTX->Config.Is64BitMode && (Byte1 & 0b00100000) == 0) {
DecodeInst->Flags |= DecodeFlags::FLAG_REX_XGPR_B;
}
if (options.w) {
DecodeInst->Flags |= DecodeFlags::FLAG_OPTION_AVX_W;
}
if (!(map_select >= 1 && map_select <= 3)) {
LogMan::Msg::EFmt("We don't understand a map_select of: {}", map_select);
return false;

2
FEXCore/Source/Interface/Core/X86Tables/X86Tables.h
View File

@ -27,7 +27,7 @@ constexpr uint32_t FLAG_LOCK = (1 << 2);
constexpr uint32_t FLAG_LEGACY_PREFIX = (1 << 3);
constexpr uint32_t FLAG_REX_PREFIX = (1 << 4);
constexpr uint32_t FLAG_VSIB_BYTE = (1 << 5);
// Hole where 1 << 6 is
constexpr uint32_t FLAG_OPTION_AVX_W = (1 << 6);
constexpr uint32_t FLAG_REX_WIDENING = (1 << 7);
constexpr uint32_t FLAG_REX_XGPR_B = (1 << 8);
constexpr uint32_t FLAG_REX_XGPR_X = (1 << 9);