[all-commits] [llvm/llvm-project] 3fd1cc: [SLP] Add Preheader to CSE blocks after hoisting C...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3fd1cc2574364ce438ac34da56c848ad5903d774
      https://github.com/llvm/llvm-project/commit/3fd1cc2574364ce438ac34da56c848ad5903d774
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2022-09-12 (Mon, 12 Sep 2022)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/X86/cse.ll

  Log Message:
  -----------
  [SLP] Add Preheader to CSE blocks after hoisting CSE-able instrs.

Adding the pre-header to CSEBlocks ensures instructions are CSE'd even
after hoisting.

This was original discovered by @atrick a while ago.

Reviewed By: ABataev

Differential Revision: https://reviews.llvm.org/D133649