[all-commits] [llvm/llvm-project] fd347c: [X86] Add InstFixup for masked `unpck{l|h}pd` -> m...

[goldsteinn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fd347ceac490e28a1b1590e05ac6f9e570d4dc99
      https://github.com/llvm/llvm-project/commit/fd347ceac490e28a1b1590e05ac6f9e570d4dc99
  Author: Noah Goldstein <goldstein.w.n at gmail.com>
  Date:   2023-04-06 (Thu, 06 Apr 2023)

  Changed paths:
    M llvm/lib/Target/X86/X86FixupInstTuning.cpp
    M llvm/test/CodeGen/X86/tuning-shuffle-unpckpd-avx512.ll
    M llvm/test/CodeGen/X86/tuning-shuffle-unpckpd.ll

  Log Message:
  -----------
  [X86] Add InstFixup for masked `unpck{l|h}pd` -> masked `shufpd`

This is a follow up D147507 which removed the prior transformation to
`shufps` which was incorrect as the mask was for 64-bit double
elements, not 32-bit float elements. Using `shufpd` for the
replacement, however, preserves the mask semantics and has the same
benefits as `shufps`.

Reviewed By: pengfei, RKSimon

Differential Revision: https://reviews.llvm.org/D147541