[PATCH] D57867: [x86] split more 256/512-bit shuffles in lowering

[Sanjay Patel via Phabricator via llvm-commits]

spatel created this revision.
spatel added reviewers: craig.topper, RKSimon, andreadb.
Herald added a subscriber: mcrosier.

This is intentionally a small step because it's hard to know exactly where we might introduce a conflicting transform with the code that tries to form wider shuffles. But I think this is safe - if we have a wide shuffle with 2 operands, then we should do better with an extract + narrow shuffle.


https://reviews.llvm.org/D57867

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/avx512-shuffles/partial_permute.ll
  test/CodeGen/X86/pr34592.ll
  test/CodeGen/X86/trunc-subvector.ll
  test/CodeGen/X86/vector-shuffle-256-v4.ll
  test/CodeGen/X86/vector-shuffle-512-v8.ll

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