[PATCH] D54959: [X86] Add a combine for back to back VSRAI instructions

[Craig Topper via Phabricator via llvm-commits]

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

Expansion of SIGN_EXTEND_INREG can create a VSRAI instruction. If there is already a VSRAI after it, we should combine them into a larger VSRAI


https://reviews.llvm.org/D54959

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/Analysis/CostModel/X86/testshiftashr.ll
  test/CodeGen/X86/vector-shift-ashr-sub128.ll

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