[PATCH] D144832: [X86] Split off x86-64-v* tuning flags

[Noah Goldstein via Phabricator via llvm-commits]

goldstein.w.n added inline comments.


================
Comment at: llvm/lib/Target/X86/X86.td:776
+    TuningFastGather,
+    TuningPOPCNTFalseDeps,
+    TuningInsertVZEROUPPER,
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RKSimon wrote:
> goldstein.w.n wrote:
> > I thought this was fixed by skylake?
> https://github.com/llvm/llvm-project/issues/33216 suggests its still a problem on Skylake/CannonLake as well.
https://stackoverflow.com/questions/25078285/replacing-a-32-bit-loop-counter-with-64-bit-introduces-crazy-performance-deviati

says fixed by cannonlake so should be good to drop by v4  (definitely fixed by ICL).


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D144832/new/

https://reviews.llvm.org/D144832