[PATCH] D48431: AMDGPU: Force skip over s_sendmsg and exp instructions

[Nicolai Hähnle via Phabricator via llvm-commits]

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

These instructions interact with hardware blocks outside the shader core,
and they can have "scalar" side effects even when EXEC = 0. We don't
want these scalar side effects to occur when all lanes want to skip
these instructions, so always add the execz skip branch instruction
for basic blocks that contain them.

Change-Id: Ieaeb58352e2789ffd64745603c14970c60819d44


Repository:
  rL LLVM

https://reviews.llvm.org/D48431

Files:
  lib/Target/AMDGPU/SIInsertSkips.cpp
  test/CodeGen/AMDGPU/llvm.amdgcn.exp.ll
  test/CodeGen/AMDGPU/llvm.amdgcn.sendmsg.ll

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