[all-commits] [llvm/llvm-project] d84dc8: [InstCombine] Add handling for (or (zext x), (shl ...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d84dc8ff93e94f6f0b5a5222afc26e0ee3a4b4f9
      https://github.com/llvm/llvm-project/commit/d84dc8ff93e94f6f0b5a5222afc26e0ee3a4b4f9
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-03-09 (Sun, 09 Mar 2025)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
    M llvm/test/Transforms/InstCombine/iX-ext-split.ll

  Log Message:
  -----------
  [InstCombine] Add handling for (or (zext x), (shl (zext (ashr x, bw/2-1))), bw/2) -> (sext x) fold (#130316)

Minor tweak to #129363 which handled all the cases where there was a sext for the original source value, but not for cases where the source is already half the size of the destination type

Another regression noticed in #76524



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