[PATCH] D13123: PeepholeOptimizer: Remove redundant copies

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: qcolombet.
arsenm added a subscriber: llvm-commits.

If a virtual register is copied and another copy was already
seen, replace with the previous copy.
    
This pattern shows up from various operand restrictions
AMDGPU has which require inserting copies depending
on the register class of the operands.

http://reviews.llvm.org/D13123

Files:
  lib/CodeGen/PeepholeOptimizer.cpp
  test/CodeGen/AMDGPU/address-space.ll
  test/CodeGen/AMDGPU/use-sgpr-multiple-times.ll

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