[PATCH] D70453: [Support] Don't require the XCR0 OSXSAVE bits when detecting skylake-avx512.

Tue Nov 19 14:51:32 PST 2019

fhahn added a comment.

In D70453#1752392 <https://reviews.llvm.org/D70453#1752392>, @craig.topper wrote:

> Can we check sysctl for apple?

sysctl would return AVX512 as optional, but I am not sure if that adds any value? As mentioned in the comment, Darwin will save the AXV512 context on AVX512 hardware on-demand. More details can be found here: https://github.com/apple/darwin-xnu/blob/master/osfmk/i386/fpu.c#L174

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https://reviews.llvm.org/D70453