[polly] r284622 - [polly] Fix non-determinism in polly BlockGenerators

[Mandeep Singh Grang via llvm-commits]

Author: mgrang
Date: Wed Oct 19 12:56:49 2016
New Revision: 284622

URL: http://llvm.org/viewvc/llvm-project?rev=284622&view=rev
Log:
[polly] Fix non-determinism in polly BlockGenerators

Summary: Iterating over SeenBlocks which is a SmallPtrSet results in non-determinism in codegen

Reviewers: jdoerfert, zinob, grosser

Tags: #polly

Differential Revision: https://reviews.llvm.org/D25778

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

Modified: polly/trunk/lib/CodeGen/BlockGenerators.cpp
URL: http://llvm.org/viewvc/llvm-project/polly/trunk/lib/CodeGen/BlockGenerators.cpp?rev=284622&r1=284621&r2=284622&view=diff
==============================================================================
--- polly/trunk/lib/CodeGen/BlockGenerators.cpp (original)
+++ polly/trunk/lib/CodeGen/BlockGenerators.cpp Wed Oct 19 12:56:49 2016
@@ -1193,7 +1193,7 @@ void RegionGenerator::copyStmt(ScopStmt
 
   // Iterate over all blocks in the region in a breadth-first search.
   std::deque<BasicBlock *> Blocks;
-  SmallPtrSet<BasicBlock *, 8> SeenBlocks;
+  SmallSetVector<BasicBlock *, 8> SeenBlocks;
   Blocks.push_back(EntryBB);
   SeenBlocks.insert(EntryBB);
 
@@ -1232,7 +1232,7 @@ void RegionGenerator::copyStmt(ScopStmt
 
     // And continue with new successors inside the region.
     for (auto SI = succ_begin(BB), SE = succ_end(BB); SI != SE; SI++)
-      if (R->contains(*SI) && SeenBlocks.insert(*SI).second)
+      if (R->contains(*SI) && SeenBlocks.insert(*SI))
         Blocks.push_back(*SI);
 
     // Remember value in case it is visible after this subregion.