[PATCH] D41895: [X86] Another attempt at support prefer-vector-width function attribute

[Guillaume Chatelet via Phabricator via llvm-commits]

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@craig.topper

LLVM currently prefers 256-bit operations even on recent Intel processors.
https://godbolt.org/z/dffKPxo53

Is there a reason why there are no `TuningPrefer512Bit` yet (source <https://github.com/llvm/llvm-project/blob/60c6e9649de8ce9e6818b2d92f1d45ba6da49ca8/llvm/lib/Target/X86/X86.td#L559>). Should it be added?


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  rL LLVM

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https://reviews.llvm.org/D41895