[all-commits] [llvm/llvm-project] 8ac6b4: [X86] Ensure VPERMV3 -> VPERMV fold comes from a d...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8ac6b415e4e5e631410d9cf6a10f15668f663441
      https://github.com/llvm/llvm-project/commit/8ac6b415e4e5e631410d9cf6a10f15668f663441
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-07-08 (Mon, 08 Jul 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    A llvm/test/CodeGen/X86/pr97968.ll

  Log Message:
  -----------
  [X86] Ensure VPERMV3 -> VPERMV fold comes from a double width vector

#96414 + #97206 didn't ensure that we were extracting subvectors from a vector double the width of the destination.

We can relax this in a future patch, but fix the #97968 crash first.

Fixes #97968



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