[all-commits] [llvm/llvm-project] 5d71f7: [X86] SimplifyDemandedVectorEltsForTargetNode - do...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/release/21.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 5d71f7c2ac25b86f67dcba875f4508f00be32994
      https://github.com/llvm/llvm-project/commit/5d71f7c2ac25b86f67dcba875f4508f00be32994
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-08-21 (Thu, 21 Aug 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    A llvm/test/CodeGen/X86/pr154492.ll

  Log Message:
  -----------
  [X86] SimplifyDemandedVectorEltsForTargetNode - don't split X86ISD::CVTTP2UI nodes without AVX512VL (#154504)

Unlike CVTTP2SI, CVTTP2UI is only available on AVX512 targets, so we
don't fallback to the AVX1 variant when we split a 512-bit vector, so we
can only use the 128/256-bit variants if we have AVX512VL.

Fixes #154492

(cherry picked from commit d770567a514716cdb250a2dee635435c22622e34)



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