Disable the parallel code generation in case of extension nodes

We can not perform the dependence analysis and, consequently, the parallel
code generation in case the schedule tree contains extension nodes.

Reviewed-by: Tobias Grosser <tobias@grosser.es>

Differential Revision: https://reviews.llvm.org/D30394

llvm-svn: 296325

1 files changed, 8 insertions, 0 deletions

diff --git a/polly/lib/CodeGen/IslAst.cpp b/polly/lib/CodeGen/IslAst.cpp
index c60cd68e547..e8ce6b4dc0b 100644
--- a/polly/lib/CodeGen/IslAst.cpp
+++ b/polly/lib/CodeGen/IslAst.cpp
@@ -400,6 +400,14 @@ void IslAst::init(const Dependences &D) {
   bool PerformParallelTest = PollyParallel || DetectParallel ||
                              PollyVectorizerChoice != VECTORIZER_NONE;
 
+  // We can not perform the dependence analysis and, consequently,
+  // the parallel code generation in case the schedule tree contains
+  // extension nodes.
+  auto *ScheduleTree = S->getScheduleTree();
+  PerformParallelTest =
+      PerformParallelTest && !S->containsExtensionNode(ScheduleTree);
+  isl_schedule_free(ScheduleTree);
+
   // Skip AST and code generation if there was no benefit achieved.
   if (!benefitsFromPolly(S, PerformParallelTest))
     return;