[polly] r229253 - Do not try to optimize empty SCoPs.

[Johannes Doerfert]

Author: jdoerfert
Date: Sat Feb 14 06:02:24 2015
New Revision: 229253

URL: http://llvm.org/viewvc/llvm-project?rev=229253&view=rev
Log:
Do not try to optimize empty SCoPs.

Modified:
    polly/trunk/lib/Transform/ScheduleOptimizer.cpp

Modified: polly/trunk/lib/Transform/ScheduleOptimizer.cpp
URL: http://llvm.org/viewvc/llvm-project/polly/trunk/lib/Transform/ScheduleOptimizer.cpp?rev=229253&r1=229252&r2=229253&view=diff
==============================================================================
--- polly/trunk/lib/Transform/ScheduleOptimizer.cpp (original)
+++ polly/trunk/lib/Transform/ScheduleOptimizer.cpp Sat Feb 14 06:02:24 2015
@@ -473,6 +473,14 @@ bool IslScheduleOptimizer::isProfitableS
 }
 
 bool IslScheduleOptimizer::runOnScop(Scop &S) {
+
+  // Skip empty SCoPs but still allow code generation as it will delete the
+  // loops present but not needed.
+  if (S.getSize() == 0) {
+    S.markAsOptimized();
+    return false;
+  }
+
   Dependences *D = &getAnalysis<Dependences>();
 
   if (!D->hasValidDependences())