[CodeGen] Emit parallel_loop_access for each loop in the loop stack.
Summary:
Emit !llvm.mem.parallel_loop_access metadata for memory accesses even if the parallel loop is not the top on the loop stack.
Fixes llvm.org/PR37558.
Reviewers: ABataev, hfinkel, amusman, tyler.nowicki
Reviewed By: hfinkel
Subscribers: Meinersbur, hfinkel, cfe-commits
Differential Revision: https://reviews.llvm.org/D48808
llvm-svn: 338810
diff --git a/clang/lib/CodeGen/CGLoopInfo.cpp b/clang/lib/CodeGen/CGLoopInfo.cpp
index 09089bf..8f9a9b9 100644
--- a/clang/lib/CodeGen/CGLoopInfo.cpp
+++ b/clang/lib/CodeGen/CGLoopInfo.cpp
@@ -344,6 +344,17 @@
return;
}
- if (L.getAttributes().IsParallel && I->mayReadOrWriteMemory())
- I->setMetadata("llvm.mem.parallel_loop_access", L.getLoopID());
+ if (I->mayReadOrWriteMemory()) {
+ SmallVector<Metadata *, 2> ParallelLoopIDs;
+ for (const LoopInfo &AL : Active)
+ if (AL.getAttributes().IsParallel)
+ ParallelLoopIDs.push_back(AL.getLoopID());
+
+ MDNode *ParallelMD = nullptr;
+ if (ParallelLoopIDs.size() == 1)
+ ParallelMD = cast<MDNode>(ParallelLoopIDs[0]);
+ else if (ParallelLoopIDs.size() >= 2)
+ ParallelMD = MDNode::get(I->getContext(), ParallelLoopIDs);
+ I->setMetadata("llvm.mem.parallel_loop_access", ParallelMD);
+ }
}