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[Polly] Model PHI nodes without demoting them

Authored by jdoerfert on Feb 4 2015, 11:10 AM.


This allows us to model PHI nodes in the polyhedral description
without demoting them. The modeling however will result in the
same accesses as the demotion would have introduced.

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jdoerfert updated this revision to Diff 19341.Feb 4 2015, 11:10 AM
jdoerfert retitled this revision from to [Polly] Model PHI nodes without demoting them.
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grosser edited edge metadata.Feb 4 2015, 11:20 PM

Hi Johannes,

the patch looks good in general. As you mentioned earlier, the test coverage is still a little low. I would be interested in a loop with a non-IV PHI node, as well as two tests where the values in the PHis are instructions, once executed in the incoming basic blocks and once in a block that is post-dominated by the relevant incoming block. What do you think?


155 ↗(On Diff #19341)


102 ↗(On Diff #19341)

Maybe a comment on how we handle PHI accesses, where loads/stores are created.

111 ↗(On Diff #19341)

Can this ever happen? If it can, maybe this is worth a test case, otherwise maybe make this an assert?

229 ↗(On Diff #19341)

No need for braces?

jdoerfert updated this revision to Diff 19408.Feb 5 2015, 7:59 AM
jdoerfert edited edge metadata.

I don't know what test you exactly want. I added some and also fixed an
inconsistency I encountered along the way. If you want a specific test please
give me some C snippet or a at least a more precise description.

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