[all-commits] [llvm/llvm-project] b3a7ab: [DAG] Don't allow implicit truncation in extract_e...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b3a7ab6f1f6954bfb1da0683aa5d03a2837c7065
      https://github.com/llvm/llvm-project/commit/b3a7ab6f1f6954bfb1da0683aa5d03a2837c7065
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-12-30 (Mon, 30 Dec 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/PowerPC/scalar_vector_test_5.ll

  Log Message:
  -----------
  [DAG] Don't allow implicit truncation in extract_element(bitcast(scalar_to_vector(X))) -> trunc(srl(X,C)) fold

Limits #117900 to only fold when scalar_to_vector doesn't perform implicit truncation, as the scaled shift calculation doesn't currently account for this - this can be addressed in a future update.

Fixes #121306



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