[PATCH] D39677: AMDGPU: Fix multi-use shl/add combine

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
Herald added subscribers: t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng, kzhuravl.

This was using a custom function that didn't handle the
addressing modes properly for private. Use
isLegalAddressingMode to avoid duplicating this.

      

Additionally, skip the combine if there is only one use
since the standard combine will handle it.


https://reviews.llvm.org/D39677

Files:
  lib/Target/AMDGPU/SIISelLowering.cpp
  lib/Target/AMDGPU/SIISelLowering.h
  test/CodeGen/AMDGPU/shl_add_ptr.ll

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