Model PHI nodes without demoting them

  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.

Differential Revision: http://reviews.llvm.org/D7415

llvm-svn: 228433

1 files changed, 4 insertions, 0 deletions

diff --git a/polly/lib/Transform/CodePreparation.cpp b/polly/lib/Transform/CodePreparation.cpp
index 5847c695968..5aba77e7662 100644
--- a/polly/lib/Transform/CodePreparation.cpp
+++ b/polly/lib/Transform/CodePreparation.cpp
@@ -27,6 +27,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "polly/LinkAllPasses.h"
+#include "polly/ScopDetection.h"
 #include "polly/CodeGen/BlockGenerators.h"
 #include "polly/Support/ScopHelper.h"
 #include "llvm/Analysis/DominanceFrontier.h"
@@ -201,6 +202,9 @@ void CodePreparation::getAnalysisUsage(AnalysisUsage &AU) const {
 }
 
 bool CodePreparation::runOnFunction(Function &F) {
+  if (PollyModelPHINodes)
+    return false;
+
   LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
   SE = &getAnalysis<ScalarEvolution>();