Craig Topper 635d383fad [X86] Enable -mprefer-vector-width=256 by default for Skylake-avx512 and later Intel CPUs. ...

AVX512 instructions can cause a frequency drop on these CPUs. This
can negate the performance gains from using wider vectors. Enabling
prefer-vector-width=256 will prevent generation of zmm registers
unless explicit 512 bit operations are used in the original source
code.

I believe gcc and icc both do something similar to this by default.

Differential Revision: https://reviews.llvm.org/D67259

llvm-svn: 371694

2019-09-11 23:54:36 +00:00

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