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[SCEV] Introduce ScalarEvolution::getOne and getZero.

Authored by sanjoy on Sep 17 2015, 4:00 PM.



It is fairly common to call SE->getConstant(Ty, 0) or
SE->getConstant(Ty, 1); this change makes such uses a little bit

I've refactored the call sites I could find easily to use getZero /

If this were smaller I'd check it in for post commit review, but given
that it's is fairly large, it'd be nice to have some extra eyes look
this over.

I can bootstrap clang with this change.

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Event Timeline

sanjoy updated this revision to Diff 35044.Sep 17 2015, 4:00 PM
sanjoy retitled this revision from to [SCEV] Introduce ScalarEvolution::getOne and getZero..
sanjoy updated this object.
sanjoy added reviewers: reames, hfinkel, majnemer.
sanjoy added a subscriber: llvm-commits.
reames accepted this revision.Sep 22 2015, 4:12 PM
reames edited edge metadata.


This revision is now accepted and ready to land.Sep 22 2015, 4:12 PM
This revision was automatically updated to reflect the committed changes.