[PATCH] D51818: [X86] Create paddus/psubus from narrower vectors with i8/i16 element types.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: RKSimon, spatel.

This patch allows vectors with a power of 2 number of elements and i8/i16 element type to select paddus/psubus instructions. ReplaceNodeResults has been updated to custom widen these operations up to 128 bits like we already do for PAVG.

Another step towards fixing PR38691


https://reviews.llvm.org/D51818

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/paddus.ll
  test/CodeGen/X86/psubus.ll
  test/CodeGen/X86/sse2-intrinsics-canonical.ll

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