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d39475
2017 Nov 01
5
RFC: [X86] Introducing command line options to prefer narrower vector instructions even when wider instructions are available
Hello all,
I would like to propose adding the -mprefer-avx256 and -mprefer-avx128
command line flags supported by latest GCC to clang. These flags will be
used to limit the vector register size presented by TTI to the vectorizers.
The backend will still be able to use wider registers for code written
using the instrinsics in x86intrin.h. And the backend will still be able to
use AVX512VL