[all-commits] [llvm/llvm-project] 6eb47b: [InstCombine] Migrate undef -> poison only for cer...

[Sean Clarke via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6eb47bb35bed321cbed22f46de4e301152dbe544
      https://github.com/llvm/llvm-project/commit/6eb47bb35bed321cbed22f46de4e301152dbe544
  Author: Sean Clarke <seanedwardsclarke at gmail.com>
  Date:   2026-06-06 (Sat, 06 Jun 2026)

  Changed paths:
    M llvm/include/llvm/IR/PatternMatch.h
    M llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
    M llvm/test/Transforms/InstCombine/fpextend.ll
    M llvm/test/Transforms/InstCombine/vector-casts-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/vector-casts.ll

  Log Message:
  -----------
  [InstCombine] Migrate undef -> poison only for certain cast-related optimizations (#201631)

Further deprecate UndefValue by restricting several related
optimizations in InstCombineCasts to PoisonValue only. Update regression
tests to reflect these changes.



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