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Remove an incorrect assert in MFMASmallGemmSingleWaveOpt. #130131

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Merged
merged 4 commits into from
Apr 24, 2025
Merged

Remove an incorrect assert in MFMASmallGemmSingleWaveOpt. #130131

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87f1d60
Remove an incorrect assert in MFMASmallGemmSingleWaveOpt.
anjenner Mar 6, 2025
0a47cb5
Address review feedback.
anjenner Mar 13, 2025
097fbb7
Reduce testcase, remove -global-isel, drop Attrs comments and check o…
anjenner Apr 22, 2025
26aafac
Make mtriple change suggested by Matt Arsenault.
anjenner Apr 23, 2025
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1 change: 0 additions & 1 deletion llvm/lib/Target/AMDGPU/AMDGPUIGroupLP.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1891,7 +1891,6 @@ class MFMASmallGemmSingleWaveOpt final : public IGLPStrategy {
}
}

assert(Cache->size());
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@jrbyrnes jrbyrnes Mar 6, 2025

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Can return false?
There are other InstructionRule in MFMASmallGemmSingleWaveOpt that make a similar assert -- can you apply the same change in those places as well?

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@anjenner anjenner Mar 13, 2025

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I didn't think an explicit "return false" would be helpful - if Cache is empty at this point then the loop immediately below will do zero iterations and we'll hit the "return false" immediately below that.

The only other similar assert I found was the one in the next inner class down, MFMASmallGemmSingleWaveOpt::IsPermForDSW . Again this will return false if Cache is empty due to the llvm::any_of() call.

auto *DAG = SyncPipe[0].DAG;
for (auto &Elt : *Cache) {
if (DAG->IsReachable(Elt, const_cast<SUnit *>(SU)))
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