tree a4bbc0dc925fbb46e5bea71a8160dc06d17b6c87
parent 3ae61eb220dc8f1fa0dd551a9575237b84dae61d
author Simon Pilgrim <llvm-dev@redking.me.uk> 1783363177 +0100
committer GitHub <noreply@github.com> 1783363177 +0000
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[X86] combineToHorizontalAddSub - use PostShuffleMask to determine undemanded subvectors (#207789)

For cases where the middle-end has created a 256-bit HADD/SUB pattern
with unused upper 128-bit subvectors, use the PostShuffleMask undefined
ranges to remove any unused 128-bit HADD/SUB ops.