[PATCH] D74942: AMDGPU/GlobalISel: Start matching s_lshlN_add_u32 instructions

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: nhaehnle, kerbowa, foad.
Herald added subscribers: hiraditya, t-tye, tpr, dstuttard, rovka, yaxunl, wdng, jvesely, kzhuravl.
Herald added a project: LLVM.

Use a hack to only enable this for GlobalISel.

      

Technically this also works with SelectionDAG, but the divergence
selection isn't reliable enough and a few cases fail, but I have no
desire to spend time writing the manual expansion code for it. The DAG
actually does a better job since it catches using v_add_lshl_u32 in
the mixed SGPR/VGPR cases.


https://reviews.llvm.org/D74942

Files:
  llvm/lib/Target/AMDGPU/SIInstrInfo.td
  llvm/lib/Target/AMDGPU/SOPInstructions.td
  llvm/test/CodeGen/AMDGPU/GlobalISel/shlN_add.ll

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D74942.245779.patch
Type: text/x-patch
Size: 10438 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20200221/3ca90ba9/attachment.bin>