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Merge pull request #3594 from Sonicadvance1/enhanced_repmovs

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CPUID: Enable enhanced rep movs in more situations
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Alyssa Rosenzweig 2024-04-23 13:10:39 -04:00 committed by GitHub
commit 68e543c81d
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2 changed files with 3 additions and 1 deletions
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3
FEXCore/Source/Interface/Core/CPUID.cpp
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@ -595,7 +595,8 @@ FEXCore::CPUID::FunctionResults CPUIDEmu::Function_07h(uint32_t Leaf) const {
// Disable Enhanced REP MOVS when TSO is enabled.
// vcruntime140 memmove will use `rep movsb` in this case which completely destroys perf in Hades(appId 1145360)
// This is due to LRCPC performance on Cortex being abysmal.
const uint32_t SupportsEnhancedREPMOVS = CTX->SoftwareTSORequired() ? 0 : 1;
// Only enable EnhancedREPMOVS if SoftwareTSO isn't required OR if MemcpySetTSO is not enabled.
const uint32_t SupportsEnhancedREPMOVS = CTX->SoftwareTSORequired() == false || MemcpySetTSOEnabled() == false;
// Number of subfunctions
Res.eax = 0x0;

1
FEXCore/Source/Interface/Core/CPUID.h
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@ -119,6 +119,7 @@ private:
uint32_t Cores {};
FEX_CONFIG_OPT(HideHypervisorBit, HIDEHYPERVISORBIT);
FEX_CONFIG_OPT(SmallTSCScale, SMALLTSCSCALE);
FEX_CONFIG_OPT(MemcpySetTSOEnabled, MEMCPYSETTSOENABLED);
// XFEATURE_ENABLED_MASK
// Mask that configures what features are enabled on the CPU.