x64CPUDetect: Add flag for slow PDEP/PEXT on AMD Zen

For some unknown reason PDEP and PEXT are ridiculously slow on AMD Zen architecture.
2026-08-20 01:15:08 -05:00 · 2020-01-26 22:08:55 -05:00
parent 52b52631c2
commit 185e49d2a9
2 changed files with 4 additions and 0 deletions
--- a/Source/Core/Common/x64CPUDetect.cpp
+++ b/Source/Core/Common/x64CPUDetect.cpp
@@ -175,6 +175,7 @@ void CPUInfo::Detect()
  }

  bFlushToZero = bSSE;
+  bFastBMI2 = bBMI2 && !bZen;

  if (max_ex_fn >= 0x80000004)
  {