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CPUDetect: Indicate slow PDEP/PEXT only for Zen1/+/2 (Family 23)

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This commit is contained in:
altimumdelta 2020-11-08 14:27:24 +01:00
parent 2acd3abe35
commit 77dc289517
2 changed files with 5 additions and 6 deletions
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5
Source/Core/Common/CPUDetect.h
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@ -42,8 +42,7 @@ struct CPUInfo
bool bAVX2 = false;
bool bBMI1 = false;
bool bBMI2 = false;
// PDEP and PEXT are ridiculously slow on AMD Zen, so we have this flag to avoid using them there
// Zen 2 is also affected by this issue
// PDEP and PEXT are ridiculously slow on AMD Zen1, Zen1+ and Zen2 (Family 23)
bool bFastBMI2 = false;
bool bFMA = false;
bool bFMA4 = false;
@ -57,7 +56,7 @@ struct CPUInfo
bool bLAHFSAHF64 = false;
bool bLongMode = false;
bool bAtom = false;
bool bZen = false;
bool bZen1p2 = false;
// ARMv8 specific
bool bFP = false;

6
Source/Core/Common/x64CPUDetect.cpp
View file

@ -118,9 +118,9 @@ void CPUInfo::Detect()
(model == 0x1C || model == 0x26 || model == 0x27 || model == 0x35 || model == 0x36 ||
model == 0x37 || model == 0x4A || model == 0x4D || model == 0x5A || model == 0x5D))
bAtom = true;
// Detect AMD Zen (all models)
// Detect AMD Zen1, Zen1+ and Zen2
if (family == 23)
bZen = true;
bZen1p2 = true;
logical_cpu_count = (cpu_id[1] >> 16) & 0xFF;
ht = (cpu_id[3] >> 28) & 1;
@ -175,7 +175,7 @@ void CPUInfo::Detect()
}
bFlushToZero = bSSE;
bFastBMI2 = bBMI2 && !bZen;
bFastBMI2 = bBMI2 && !bZen1p2;
if (max_ex_fn >= 0x80000004)
{