[all-commits] [llvm/llvm-project] 427423: [X86] combineVTRUNCSAT - don't split 128-bit conca...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 427423946a6ea78bdea7c54e1afbcfd41333e991
      https://github.com/llvm/llvm-project/commit/427423946a6ea78bdea7c54e1afbcfd41333e991
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2026-04-28 (Tue, 28 Apr 2026)

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

  Log Message:
  -----------
  [X86] combineVTRUNCSAT - don't split 128-bit concatenated vectors when folding to PACKSS/US (#194347)

If the VTRUNCS/US node has 128-bit src and dst types, then ensure we
don't split into sub-128-bit vectors - just treat it as padded with
zeros to match VTRUNC behaviour.

Fixes #194344



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