[PATCH] D50600: AMDGPU: Use splat vectors for undefs when folding canonicalize

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: rampitec.
Herald added subscribers: t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng, kzhuravl.

If one of the elements is undef, use the canonicalized constant
from the other element instead of 0.

      

Splat vectors are more useful for other optimizations, such
as matching vector clamps. This was breaking on clamps
of half3 from the undef 4th component.


https://reviews.llvm.org/D50600

Files:
  lib/Target/AMDGPU/SIISelLowering.cpp
  test/CodeGen/AMDGPU/clamp.ll
  test/CodeGen/AMDGPU/fcanonicalize.f16.ll

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