[all-commits] [llvm/llvm-project] 69921f: [InstCombine] Improve TryToSinkInstruction with mu...

[annamthomas via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 69921f6f4558a2c5c8e48c5b12d83a65127bfecc
      https://github.com/llvm/llvm-project/commit/69921f6f4558a2c5c8e48c5b12d83a65127bfecc
  Author: Anna Thomas <anna at azul.com>
  Date:   2021-09-21 (Tue, 21 Sep 2021)

  Changed paths:
    M llvm/include/llvm/IR/Value.h
    M llvm/lib/IR/Value.cpp
    M llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
    M llvm/test/Transforms/InstCombine/icmp-mul-zext.ll
    M llvm/test/Transforms/InstCombine/sink_instruction.ll
    M llvm/test/Transforms/SLPVectorizer/X86/blending-shuffle-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/blending-shuffle.ll

  Log Message:
  -----------
  [InstCombine] Improve TryToSinkInstruction with multiple uses

This patch allows sinking an instruction which can have multiple uses in a
single user. We were previously over-restrictive by looking for exactly one use,
rather than one user.

Also added an API for retrieving a unique undroppable user.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D109700