[all-commits] [llvm/llvm-project] 19c5cf: [SLP]Fix comparator for cmp instruction vectorizat...

[Andrew V. Tischenko via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 19c5cf4167f645ac4f612a32abcc4d5a469cb214
      https://github.com/llvm/llvm-project/commit/19c5cf4167f645ac4f612a32abcc4d5a469cb214
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2021-12-09 (Thu, 09 Dec 2021)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/X86/used-reduced-op.ll
    A llvm/test/Transforms/SLPVectorizer/X86/vectorize-cmps.ll

  Log Message:
  -----------
  [SLP]Fix comparator for cmp instruction vectorization.

The comparator for the sort functions should provide strict weak
ordering relation between parameters. Current solution causes compiler
crash with some standard c++ library implementations, because it does
not meet this criteria. Tried to fix it + it improves the iverall
vectorization result.

Differential Revision: https://reviews.llvm.org/D115268