[all-commits] [llvm/llvm-project] bab8d1: [MachineSink] Fix for breaking phi edges with inst...

[David Green via All-commits]

  Branch: refs/heads/release/10.x
  Home:   https://github.com/llvm/llvm-project
  Commit: bab8d1790a33235dfb0e633652ca7fa21d0fb0d0
      https://github.com/llvm/llvm-project/commit/bab8d1790a33235dfb0e633652ca7fa21d0fb0d0
  Author: David Green <david.green at arm.com>
  Date:   2020-05-07 (Thu, 07 May 2020)

  Changed paths:
    M llvm/lib/CodeGen/MachineSink.cpp
    A llvm/test/CodeGen/ARM/machine-sink-multidef.ll

  Log Message:
  -----------
  [MachineSink] Fix for breaking phi edges with instructions with multiple defs

BreakPHIEdge would be set based on whether the instruction needs to
insert a new critical edge to allow sinking into a block where the uses
are PHI nodes. But for instructions with multiple defs it would be reset
on the second def, allowing the instruciton to sink where it should not.

Fixes PR44981

Differential Revision: https://reviews.llvm.org/D78087

(cherry picked from commit 44c4ba34d001dcf538d7396007b5611d6f697f86)