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Add a workaround to fix SCoPs rejected because of 'region not simple' 

llvm-svn: 144281
This commit is contained in:
Tobias Grosser 2011-11-10 12:45:07 +00:00
parent e5e171eadd
commit bef690f57f
1 changed files with 12 additions and 3 deletions
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15
polly/lib/RegisterPasses.cpp
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@ -114,10 +114,19 @@ static void registerPollyPasses(const llvm::PassManagerBuilder &Builder,
PM.add(polly::createCodePreparationPass());
PM.add(polly::createRegionSimplifyPass());
// FIXME: Needed as RegionSimplifyPass destroys the canonical form of
// induction variables (It changes the order of the operands in the
// PHI nodes).
// FIXME: The next two passes should not be necessary here. They are currently
// because of two problems:
//
// 1. The RegionSimplifyPass destroys the canonical form of induction
// variables,as it produces PHI nodes with incorrectly ordered
// operands. To fix this we run IndVarSimplify.
//
// 2. IndVarSimplify does not preserve the region information and
// the regioninfo pass does currently not recover simple regions.
// As a result we need to run the RegionSimplify pass again to
// recover them
PM.add(llvm::createIndVarSimplifyPass());
PM.add(polly::createRegionSimplifyPass());
if (PollyViewer)
PM.add(polly::createDOTViewerPass());