[all-commits] [llvm/llvm-project] 7a7f91: [SandboxVec][Legality] Fix mask on diamond reuse w...

[vporpo via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7a7f9190d03e12dc5b57d3eb33a84d078de43104
      https://github.com/llvm/llvm-project/commit/7a7f9190d03e12dc5b57d3eb33a84d078de43104
  Author: vporpo <vporpodas at google.com>
  Date:   2025-02-12 (Wed, 12 Feb 2025)

  Changed paths:
    M llvm/include/llvm/Transforms/Vectorize/SandboxVectorizer/InstrMaps.h
    M llvm/lib/Transforms/Vectorize/SandboxVectorizer/Legality.cpp
    M llvm/lib/Transforms/Vectorize/SandboxVectorizer/Passes/BottomUpVec.cpp
    M llvm/test/Transforms/SandboxVectorizer/bottomup_basic.ll
    M llvm/unittests/Transforms/Vectorize/SandboxVectorizer/InstrMapsTest.cpp

  Log Message:
  -----------
  [SandboxVec][Legality] Fix mask on diamond reuse with shuffle (#126963)

This patch fixes a bug in the creation of shuffle masks when vectorizing
vectors in case of a diamond reuse with shuffle. The mask needs to
enumerate all elements of a vector, not treat the original vector value
as a single element. That is: if vectorizing two <2 x float> vectors
into a <4 x float> the mask needs to have 4 indices, not just 2.



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