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Disable 3DNow by default on WOW64 FEX

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Billy Laws committed 2025-08-06 22:30:38 +01:00
1 parent c28b94890c
commit 1e21416ccb
4 files changed
+47 -34
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FEXCore/Source/Interface/Config/Config.json.in
+5 -2
View File
@@ -70,7 +70,9 @@
"ENABLEPRESERVEALLABI": "enablepreserveallabi",
"DISABLEPRESERVEALLABI": "disablepreserveallabi",
"ENABLEWFXT": "enablewfxt",
"DISABLEWFXT": "disablewfxt"
"DISABLEWFXT": "disablewfxt",
"ENABLE3DNOW": "enable3dnow",
"DISABLE3DNOW": "disable3dnow"
},
"Desc": [
"Allows controlling of the CPU features in the JIT.",
@@ -92,7 +94,8 @@
"\t{enable,disable}rpres: Will force enable or disable rpres even if the host doesn't support it",
"\t{enable,disable}svebitperm: Will force enable or disable svebitperm even if the host doesn't support it",
"\t{enable,disable}preserveallabi: Will force enable or disable preserve_all abi even if the host doesn't support it",
"\t{enable,disable}wfxt: Will force enable or disable wfxt even if the host doesn't support it"
"\t{enable,disable}wfxt: Will force enable or disable wfxt even if the host doesn't support it",
"\t{enable,disable}3dnow: Will force enable or disable 3DNow even if the host doesn't support it"
]
},
"SmallTSCScale": {
FEXCore/Source/Interface/Core/CPUID.cpp
+32 -32
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@@ -925,38 +925,38 @@ FEXCore::CPUID::FunctionResults CPUIDEmu::Function_8000_0001h(uint32_t Leaf) con
(0 << 30) | // Reserved
(0 << 31); // Reserved
Res.edx = (1 << 0) | // FPU
(1 << 1) | // Virtual mode extensions
(1 << 2) | // Debugging extensions
(1 << 3) | // Page size extensions
(1 << 4) | // TSC
(1 << 5) | // MSR support
(1 << 6) | // PAE
(1 << 7) | // Machine Check Exception
(1 << 8) | // CMPXCHG8B
(1 << 9) | // APIC
(0 << 10) | // Reserved
(1 << 11) | // SYSCALL/SYSRET
(1 << 12) | // MTRR
(1 << 13) | // Page global extension
(1 << 14) | // Machine Check architecture
(1 << 15) | // CMOV
(1 << 16) | // Page attribute table
(1 << 17) | // Page-size extensions
(0 << 18) | // Reserved
(0 << 19) | // Reserved
(1 << 20) | // NX
(0 << 21) | // Reserved
(1 << 22) | // MMXExt
(1 << 23) | // MMX
(1 << 24) | // FXSAVE/FXRSTOR
(1 << 25) | // FXSAVE/FXRSTOR Optimizations
(0 << 26) | // 1 gigabit pages
(SUPPORTS_RDTSCP << 27) | // RDTSCP
(0 << 28) | // Reserved
(1 << 29) | // Long Mode
(1 << 30) | // 3DNow! Extensions
(1 << 31); // 3DNow!
Res.edx = (1 << 0) | // FPU
(1 << 1) | // Virtual mode extensions
(1 << 2) | // Debugging extensions
(1 << 3) | // Page size extensions
(1 << 4) | // TSC
(1 << 5) | // MSR support
(1 << 6) | // PAE
(1 << 7) | // Machine Check Exception
(1 << 8) | // CMPXCHG8B
(1 << 9) | // APIC
(0 << 10) | // Reserved
(1 << 11) | // SYSCALL/SYSRET
(1 << 12) | // MTRR
(1 << 13) | // Page global extension
(1 << 14) | // Machine Check architecture
(1 << 15) | // CMOV
(1 << 16) | // Page attribute table
(1 << 17) | // Page-size extensions
(0 << 18) | // Reserved
(0 << 19) | // Reserved
(1 << 20) | // NX
(0 << 21) | // Reserved
(1 << 22) | // MMXExt
(1 << 23) | // MMX
(1 << 24) | // FXSAVE/FXRSTOR
(1 << 25) | // FXSAVE/FXRSTOR Optimizations
(0 << 26) | // 1 gigabit pages
(SUPPORTS_RDTSCP << 27) | // RDTSCP
(0 << 28) | // Reserved
(1 << 29) | // Long Mode
(CTX->HostFeatures.Supports3DNow << 30) | // 3DNow! Extensions
(CTX->HostFeatures.Supports3DNow << 31); // 3DNow!
return Res;
}
FEXCore/include/FEXCore/Core/HostFeatures.h
+1
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@@ -39,6 +39,7 @@ struct HostFeatures {
bool SupportsFRINTTS {};
bool SupportsECV {};
bool SupportsWFXT {};
bool Supports3DNow {};
// Float exception behaviour
bool SupportsAFP {};
Source/Common/HostFeatures.cpp
+9
View File
@@ -435,6 +435,7 @@ static void OverrideFeatures(FEXCore::HostFeatures* Features, uint64_t ForceSVEW
ENABLE_DISABLE_OPTION(SupportsSVEBitPerm, SVEBITPERM, SVEBITPERM);
ENABLE_DISABLE_OPTION(SupportsPreserveAllABI, PRESERVEALLABI, PRESERVEALLABI);
ENABLE_DISABLE_OPTION(SupportsWFXT, WFXT, WFXT);
ENABLE_DISABLE_OPTION(Supports3DNow, 3DNOW, 3DNOW);
GET_SINGLE_OPTION(Crypto, CRYPTO);
#undef ENABLE_DISABLE_OPTION
@@ -497,6 +498,14 @@ FEXCore::HostFeatures FetchHostFeatures(FEX::CPUFeatures& Features, bool Support
#endif
HostFeatures.SupportsAVX = true;
#ifdef _WIN32
// Disable 3DNow! by default to better match the set of extensions exposed on modern CPUs
// Works around a bug breaking some uses of 3DNow in WOW64 FEX
HostFeatures.Supports3DNow = false;
#else
HostFeatures.Supports3DNow = true;
#endif
HostFeatures.SupportsAES256 = HostFeatures.SupportsAVX && HostFeatures.SupportsAES;
if (!HostFeatures.SupportsAtomics) {