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[mlir] OperationFolder: fix crash in creation of single-result-ops with in-place folds

Authored by ftynse on May 6 2020, 8:40 AM.



When the folding is performed in place, the ::fold function does not populate
its results argument to indicate that. (In the folding hook for single-result
operations, the result of the original operation is expected to be returned,
but it is then ignored by the wrapper.) OperationFolder::create would
erronously rely on the _operation_ having zero results instead of on the
_folding_ producing zero new results to populate the list of results with those
of the original operation. This would lead to a crash for single-result ops
with in-place folds where the first result is accessed uncondtionally because
the list of results was not properly populated. Use the list of values produced
by the folding instead.

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ftynse created this revision.May 6 2020, 8:40 AM
Herald added a project: Restricted Project. · View Herald TranscriptMay 6 2020, 8:40 AM
rriddle accepted this revision.May 6 2020, 11:09 AM
This revision is now accepted and ready to land.May 6 2020, 11:09 AM
bondhugula accepted this revision.May 6 2020, 11:38 AM
bondhugula added a subscriber: bondhugula.

Great catch and fix! Appreciate the thorough test case.


Nit: && "single operand op").


Nit: Exercise, pas exercice comme on dirait en francais ;-)

This revision was automatically updated to reflect the committed changes.