Add opt-bisect support to polly.

This is useful for debugging miscompiles and extracting testcases
for crashes. See http://llvm.org/docs/OptBisect.html .

Differential Revision: https://reviews.llvm.org/D33752

llvm-svn: 304480

1 files changed, 4 insertions, 1 deletions

diff --git a/polly/lib/Transform/CodePreparation.cpp b/polly/lib/Transform/CodePreparation.cpp
index 2f74395ea20..081244da810 100644
--- a/polly/lib/Transform/CodePreparation.cpp
+++ b/polly/lib/Transform/CodePreparation.cpp
@@ -72,12 +72,15 @@ void CodePreparation::getAnalysisUsage(AnalysisUsage &AU) const {
 }
 
 bool CodePreparation::runOnFunction(Function &F) {
+  if (skipFunction(F))
+    return false;
+
   LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
   SE = &getAnalysis<ScalarEvolutionWrapperPass>().getSE();
 
   splitEntryBlockForAlloca(&F.getEntryBlock(), this);
 
-  return false;
+  return true;
 }
 
 void CodePreparation::releaseMemory() { clear(); }