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Author SHA1 Message Date
Michael Zolotukhin a59a308e8d [LoopUnrollAnalyzer] Don't treat gep-instructions with simplified offset as simplified. 
Summary:
Currently we consider such instructions as simplified, which is incorrect,
because if their user isn't simplified, we can't actually simplify them too.
This biases our estimates of profitability: for instance the analyzer expects
much more gains from unrolling memcpy loops than there actually are.

Reviewers: hfinkel, chandlerc

Subscribers: mzolotukhin, llvm-commits

Differential Revision: http://reviews.llvm.org/D17365

llvm-svn: 269387
 2016-05-13 01:42:34 +00:00
Michael Zolotukhin 789ac4531c [LoopUnroll] Convert some existing tests to unit-tests. 
Summary: As we now have unit-tests for UnrollAnalyzer, we can convert some existing tests to this format. It should make the tests more robust.

Reviewers: chandlerc, sanjoy

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D17904

llvm-svn: 263318
 2016-03-12 01:28:56 +00:00
Michael Zolotukhin 57776b8159 Handle resolvable branches in complete loop unroll heuristic. 
Summary:
Resolving a branch allows us to ignore blocks that won't be executed, and thus make our estimate more accurate.
This patch is intended to be applied after D10205 (though it could be applied independently).

Reviewers: chandlerc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D10206

llvm-svn: 243084
 2015-07-24 01:53:04 +00:00