[all-commits] [llvm/llvm-project] f58cfa: [AggressiveInstCombine] Expand memchr with small ...

[Yingwei Zheng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f58cfacfafda0961396f92816692e9a316dec0c2
      https://github.com/llvm/llvm-project/commit/f58cfacfafda0961396f92816692e9a316dec0c2
  Author: Yingwei Zheng <dtcxzyw2333 at gmail.com>
  Date:   2024-07-17 (Wed, 17 Jul 2024)

  Changed paths:
    M llvm/lib/Transforms/AggressiveInstCombine/AggressiveInstCombine.cpp
    A llvm/test/Transforms/AggressiveInstCombine/memchr.ll

  Log Message:
  -----------
   [AggressiveInstCombine] Expand memchr with small constant strings (#98501)

This patch converts memchr with a small constant string into a switch.
It will reduce overhead of libcall and enable more folds (e.g.,
comparing the result with null).

References: https://en.cppreference.com/w/c/string/byte/memchr



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