[all-commits] [llvm/llvm-project] 83d178: [InstCombine] Set zero_is_poison for ctlz/cttz if ...

[Yingwei Zheng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 83d178843f4322159b6469f430a8a241b8672d6d
      https://github.com/llvm/llvm-project/commit/83d178843f4322159b6469f430a8a241b8672d6d
  Author: Yingwei Zheng <dtcxzyw2333 at gmail.com>
  Date:   2024-03-13 (Wed, 13 Mar 2024)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
    A llvm/test/Transforms/InstCombine/shift-cttz-ctlz.ll

  Log Message:
  -----------
  [InstCombine] Set zero_is_poison for ctlz/cttz if they are only used as shift amounts (#85035)

Alive2: https://alive2.llvm.org/ce/z/r-67t9

It would improve the codegen if the target doesn't provide a defined
value for ctlz/cttz with zero.



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