Commit Graph

3 Commits

Author SHA1 Message Date
Tobias Grosser 683b8e4462 Remove -polly-codegen-scev option and related code
SCEV based code generation has been the default for two weeks after having
been tested for a long time. We now drop the support the non-scev-based code
generation.

llvm-svn: 222978
2014-11-30 14:33:31 +00:00
Tobias Grosser 64b95123ef Delete trivial PHI nodes (aka stack slot sharing)
During code preperation trivial PHI nodes (mainly introduced by lcssa) are
deleted to decrease the number of introduced allocas (==> dependences). However
simply replacing them by their only incoming value would cause the independent
block pass to introduce new allocas. To prevent this we try to share stack slots
during code preperarion, hence to reuse a already created alloca 'to demote' the
trivial PHI node. This works if we know that the value stored in this alloca
will be the incoming value of the trivial PHI at the end of the predecessor
block of this trivial PHI.

Contributed-by: Johannes Doerfert <doerfert@cs.uni-saarland.de>
llvm-svn: 205320
2014-04-01 16:01:33 +00:00
Tobias Grosser 5bfa4f8eb8 CodePrepare: Do not require canonical induction variables for scev based mode
llvm-svn: 177593
2013-03-20 22:41:53 +00:00