[PATCH] D17105: AMDGPU: Fix constant bus use check with subregisters

[Matt Arsenault via llvm-commits]

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

If the two operands to an instruction were both
subregisters of the same super register, it would incorrectly
think this counted as the same constant bus use.
    
This fixes the verifier error in fmin_legacy.ll which
was missing -verify-machineinstrs.

http://reviews.llvm.org/D17105

Files:
  lib/Target/AMDGPU/SIInstrInfo.cpp
  test/CodeGen/AMDGPU/fmax_legacy.ll
  test/CodeGen/AMDGPU/fmin_legacy.ll

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