[PATCH] D80998: AMDGPU: Don't run mode switches with exec 0

[Matt Arsenault via Phabricator via llvm-commits]

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

These are scalar instructions that change vector instructions, so they
should not be executed without any active lanes.

      

The implementation of -amdgpu-skip-threshold also seem to be backwards
from expected, since decreasing it prevents removal.


https://reviews.llvm.org/D80998

Files:
  llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
  llvm/lib/Target/AMDGPU/SIInstrInfo.h
  llvm/test/CodeGen/AMDGPU/remove-short-exec-branches.mir
  llvm/test/CodeGen/AMDGPU/skip-if-dead.ll

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