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[Statepoint] Handle `undef` operands in statepoint.

Authored by dantrushin on Jan 14 2021, 11:42 AM.



Currently when spilling statepoint register operands in FixupStatepoints
we do not pay attention that it might be undef. We just generate a
spill, which may lead to verifier error because we have use without a def.

To handle it, let FixupStateponts ignore undef register operands
completely and change them to some constant value when generating
stack map. Use same value as used by ISel for this purpose (0xFEFEFEFE).

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Event Timeline

dantrushin created this revision.Jan 14 2021, 11:42 AM
dantrushin requested review of this revision.Jan 14 2021, 11:42 AM
Herald added a project: Restricted Project. · View Herald TranscriptJan 14 2021, 11:42 AM
reames accepted this revision.Jan 14 2021, 7:41 PM

LGTM w/an MIR test case added before submission.

This revision is now accepted and ready to land.Jan 14 2021, 7:41 PM

Add test case;

This revision was landed with ongoing or failed builds.Jan 18 2021, 4:22 AM
This revision was automatically updated to reflect the committed changes.