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OpcodeDispatcher: Removes SRC_RAX from SCAS

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Ryan Houdek committed 2026-09-14 14:56:36 -07:00
1 parent 8cfbc44482
commit 6f395885cb
2 files changed
+4 -4
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FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
+2 -2
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@@ -3521,7 +3521,7 @@ void OpDispatchBuilder::SCASOp(OpcodeArgs) {
Ref Src_RDI = LoadGPRRegister(X86State::REG_RDI, AddrSize);
Ref Dest_RDI = AppendSegmentOffset(Src_RDI, 0, X86Tables::DecodeFlags::FLAG_ES_PREFIX, true);
auto Src1 = LoadSourceGPR(Op, Op->Src[0], Op->Flags, {.AllowUpperGarbage = true});
auto Src1 = LoadGPRRegister(X86State::REG_RAX, Size, 0, true);
auto Src2 = _LoadMemGPRAutoTSO(Size, Dest_RDI, Size);
CalculateFlags_SUB(OpSizeFromSrc(Op), Src1, Src2);
@@ -3564,7 +3564,7 @@ void OpDispatchBuilder::SCASOp(OpcodeArgs) {
Ref Src_RDI = LoadGPRRegister(X86State::REG_RDI, AddrSize);
Ref Dest_RDI = AppendSegmentOffset(Src_RDI, 0, X86Tables::DecodeFlags::FLAG_ES_PREFIX, true);
auto Src1 = LoadSourceGPR(Op, Op->Src[0], Op->Flags, {.AllowUpperGarbage = true});
auto Src1 = LoadGPRRegister(X86State::REG_RAX, Size, 0, true);
auto Src2 = _LoadMemGPRAutoTSO(Size, Dest_RDI, Size);
CalculateFlags_SUB(OpSizeFromSrc(Op), Src1, Src2);
FEXCore/Source/Interface/Core/X86Tables/BaseTables.cpp
+2 -2
View File
@@ -349,8 +349,8 @@ const std::array<X86InstInfo, MAX_PRIMARY_TABLE_SIZE> BaseOps = []() consteval {
{0xAB, 1, X86InstInfo{"STOS", TYPE_INST, FLAGS_DEBUG_MEM_ACCESS, 0}},
{0xAC, 1, X86InstInfo{"LODS", TYPE_INST, GenFlagsSameSize(SIZE_8BIT) | FLAGS_SF_DST_RAX | FLAGS_DEBUG_MEM_ACCESS, 0}},
{0xAD, 1, X86InstInfo{"LODS", TYPE_INST, FLAGS_SF_DST_RAX | FLAGS_DEBUG_MEM_ACCESS, 0}},
{0xAE, 1, X86InstInfo{"SCAS", TYPE_INST, GenFlagsSameSize(SIZE_8BIT) | FLAGS_DEBUG_MEM_ACCESS | FLAGS_SF_SRC_RAX, 0}},
{0xAF, 1, X86InstInfo{"SCAS", TYPE_INST, FLAGS_DEBUG_MEM_ACCESS | FLAGS_SF_SRC_RAX, 0}},
{0xAE, 1, X86InstInfo{"SCAS", TYPE_INST, GenFlagsSameSize(SIZE_8BIT) | FLAGS_DEBUG_MEM_ACCESS, 0}},
{0xAF, 1, X86InstInfo{"SCAS", TYPE_INST, FLAGS_DEBUG_MEM_ACCESS, 0}},
{0xB0, 8, X86InstInfo{"MOV", TYPE_INST, GenFlagsSameSize(SIZE_8BIT) | FLAGS_SF_REX_IN_BYTE , 1}},
{0xB8, 8, X86InstInfo{"MOV", TYPE_INST, FLAGS_SF_REX_IN_BYTE | FLAGS_DISPLACE_SIZE_DIV_2 | FLAGS_DISPLACE_SIZE_MUL_2 | FLAGS_LITERAL_PATCHABLE, 4}},