[all-commits] [llvm/llvm-project] 898152: [AggressiveInstCombine] Fold strcmp for short stri...

[Maksim Kita via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8981520b19f2d2fe3d2bc80cf26318ee6b5b7473
      https://github.com/llvm/llvm-project/commit/8981520b19f2d2fe3d2bc80cf26318ee6b5b7473
  Author: Maksim Kita <kitaetoya at gmail.com>
  Date:   2023-07-19 (Wed, 19 Jul 2023)

  Changed paths:
    M llvm/include/llvm/Analysis/ValueTracking.h
    M llvm/include/llvm/Transforms/AggressiveInstCombine/AggressiveInstCombine.h
    M llvm/lib/Analysis/ValueTracking.cpp
    M llvm/lib/Transforms/AggressiveInstCombine/AggressiveInstCombine.cpp
    M llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
    M llvm/test/Transforms/AggressiveInstCombine/strcmp.ll

  Log Message:
  -----------
  [AggressiveInstCombine] Fold strcmp for short string literals

Fold strcmp() against 1-char string literals.

This designates AggressiveInstCombine as the pass for libcalls
simplifications that may need to change the control flow graph.

Fixes https://github.com/llvm/llvm-project/issues/58003.

Differential Revision: https://reviews.llvm.org/D154725