[polly] r249427 - IslAst: Give some hints why code generation might have been skipped

[Tobias Grosser via llvm-commits]

Author: grosser
Date: Tue Oct  6 11:10:46 2015
New Revision: 249427

URL: http://llvm.org/viewvc/llvm-project?rev=249427&view=rev
Log:
IslAst: Give some hints why code generation might have been skipped

Modified:
    polly/trunk/lib/CodeGen/IslAst.cpp

Modified: polly/trunk/lib/CodeGen/IslAst.cpp
URL: http://llvm.org/viewvc/llvm-project/polly/trunk/lib/CodeGen/IslAst.cpp?rev=249427&r1=249426&r2=249427&view=diff
==============================================================================
--- polly/trunk/lib/CodeGen/IslAst.cpp (original)
+++ polly/trunk/lib/CodeGen/IslAst.cpp Tue Oct  6 11:10:46 2015
@@ -545,6 +545,11 @@ void IslAstInfo::printScop(raw_ostream &
 
   if (!RootNode) {
     OS << ":: isl ast generation and code generation was skipped!\n\n";
+    OS << ":: This is either because no useful optimizations could be applied "
+          "(use -polly-process-unprofitable to enforce code generation) or "
+          "because earlier passes such as dependence analysis timed out (use "
+          "-polly-dependences-computeout=0 to set dependence analysis timeout "
+          "to infinity)\n\n";
     return;
   }