[PATCH] D77516: AMDGPU/GlobalISel: Work around forming illegal zextload after legalize

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: dsanders, aditya_nandakumar, paquette, aemerson, kerbowa.
Herald added subscribers: hiraditya, t-tye, tpr, dstuttard, rovka, yaxunl, nhaehnle, wdng, jvesely, kzhuravl.

Selection would fail after the post legalize combiner put an illegal
zextload back together.

      

The base combiner has parameter to only allow legal operations, but
they appear to not be used. I also don't see a nice way to remove a
single entry from all_combines, so just hack around this.


https://reviews.llvm.org/D77516

Files:
  llvm/lib/Target/AMDGPU/AMDGPUCombine.td
  llvm/test/CodeGen/AMDGPU/GlobalISel/zextload.ll

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