pengfei added inline comments.
================
Comment at: llvm/lib/Target/X86/X86Subtarget.cpp:271
+ // Attach EVEX512 feature when we have AVX512 features and EVEX512 is not
set.
+ size_t posNoEVEX512 = FS.rfind("-evex512");
----------------
skan wrote:
> It seems the change in X86.cpp is redundant?
It's not. We need `FeatureEVEX512` because it's independent of `FeatureAVX512`.
We will have future AVX10-256 targets that have `FeatureAVX512` only.
Here we handle old IR that don't set `evex512` in function attributes.
================
Comment at: llvm/lib/Target/X86/X86Subtarget.cpp:275
+ size_t posEVEX512 = FS.rfind("+evex512");
+ size_t posAVX512F = FS.rfind("+avx512");
+
----------------
skan wrote:
> Missing f?
No, it's intentional. Sometimes, feature attributes may not have a full set of
AVX512 features. If user only use e.g., "avx512bw", we should make sure
"evex512" attached too.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D159250/new/
https://reviews.llvm.org/D159250
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