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Author SHA1 Message Date
David L Kreitzer 188de5ae69 Adds the ability to use an epilog remainder loop during loop unrolling and makes 
this the default behavior.

Patch by Evgeny Stupachenko (evstupac@gmail.com).

Differential Revision: http://reviews.llvm.org/D18158

llvm-svn: 265388
 2016-04-05 12:19:35 +00:00
Junmo Park 6ebdc14cf1 [SCEVExpander] Make findExistingExpansion smarter 
Summary:
Extending findExistingExpansion can use existing value in ExprValueMap.
This patch gives 0.3~0.5% performance improvements on 
benchmarks(test-suite, spec2000, spec2006, commercial benchmark)
   
Reviewers: mzolotukhin, sanjoy, zzheng

Differential Revision: http://reviews.llvm.org/D15559

llvm-svn: 260938
 2016-02-16 06:46:58 +00:00
Sanjoy Das e178f46965 [LoopUnrollRuntime] Avoid high-cost trip count computation. 
Summary:
Runtime unrolling of loops needs to emit an expression to compute the
loop's runtime trip-count.  Avoid runtime unrolling if this computation
will be expensive.

Depends on D8993.

Reviewers: atrick

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8994

llvm-svn: 234846
 2015-04-14 03:20:38 +00:00