[PATCH] D30865: [AVX-512] If gather mask is all ones, use UNDEF for the source

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.

If mask is all ones we aren't going to keep any elements so we don't need a source. Currently we make sure we always have a source and even force the source to zero if it is received as undef.

This patch detects the all ones mask and forces the source to undef.


https://reviews.llvm.org/D30865

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/avx512-gather-scatter-intrin.ll

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