[PATCH] D63709: [AMDGPU] Add peephole to optimize MOV

[Piotr Sobczak via Phabricator via llvm-commits]

piotr created this revision.
Herald added subscribers: llvm-commits, t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng, jvesely, kzhuravl, arsenm, qcolombet, MatzeB.
Herald added a project: LLVM.

Add peephole optimization to remove redundant MOV if:

- the MOV is identical to a MOV in the immediate predecessor of MBB and
- no instruction between them modifies the destination register

Change-Id: Ibb187e3219ef641b7681e4123c7ca3fe8e1d14e6


Repository:
  rL LLVM

https://reviews.llvm.org/D63709

Files:
  lib/Target/AMDGPU/SIShrinkInstructions.cpp
  test/CodeGen/AMDGPU/control-flow-fastregalloc.ll
  test/CodeGen/AMDGPU/remove-redundant-mov.mir

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