[AMDGPU] Handle empty-except-for-DI regions in PreRARematerialize #516
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The existing check for this case only comes after a derefence of what can be an iterator sentinel (leading to an assert). This may not be purely NFC in that it also avoids queuing the effectively-empty region for rescheduling, but AFAICT this should be purely an optimization. Testing this seems difficult, as the high-level scheduler avoids scheduling these "empty" regions. This means a reproducer has to depend on behavior of the scheduler passes before PreRARematStage in order to craft a region which triggers the bug. Since this is a release blocker I am posting a PR now, as both Shore Shen and I have manually verified that this resolves the particular crash from SWDEV-564142 but I am still working on making a reasonable test.
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I will also post upstream, but want to put in a bit more effort into making a reasonable test first. |
kzhuravl
approved these changes
Nov 7, 2025
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[AMDGPU] Handle empty-except-for-DI regions in PreRARematerialize
The existing check for this case only comes after a derefence of what
can be an iterator sentinel (leading to an assert).
This may not be purely NFC in that it also avoids queuing the
effectively-empty region for rescheduling, but AFAICT this should be
purely an optimization.
Testing this seems difficult, as the high-level scheduler avoids
scheduling these "empty" regions. This means a reproducer has to depend
on behavior of the scheduler passes before PreRARematStage in order to
craft a region which triggers the bug.
Since this is a release blocker I am posting a PR now, as both Shore
Shen and I have manually verified that this resolves the particular
crash from SWDEV-564142 but I am still working on making a reasonable
test.