[all-commits] [llvm/llvm-project] 4214ca: [X86][AVX] Attempt to fold vpermf128(op(x, i), op(y, ...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4214ca96145c9487407925b121b85fafb1179209
      https://github.com/llvm/llvm-project/commit/4214ca96145c9487407925b121b85fafb1179209
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2021-01-11 (Mon, 11 Jan 2021)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/vector-trunc.ll

  Log Message:
  -----------
  [X86][AVX] Attempt to fold vpermf128(op(x,i),op(y,i)) -> op(vpermf128(x,y),i)

If vpermf128/vpermi128 is acting on 2 similar 'inlane' ops, then try to perform the vpermf128 first which will allow us to merge the ops.

This will help us fix one of the regressions in D56387