[MemorySSA] Use SetVector to avoid nondeterminism.
Summary:
Use a SetVector for DeadBlockSet.
Resolves PR42574.
Reviewers: george.burgess.iv, uabelho, dblaikie
Subscribers: jlebar, Prazek, mgrang, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D64601
llvm-svn: 365970
diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
index 91d33cb..39b6b88 100644
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -2238,7 +2238,7 @@
assert(Reachable.size() < F.size());
NumRemoved += F.size()-Reachable.size();
- SmallPtrSet<BasicBlock *, 16> DeadBlockSet;
+ SmallSetVector<BasicBlock *, 8> DeadBlockSet;
for (Function::iterator I = ++F.begin(), E = F.end(); I != E; ++I) {
auto *BB = &*I;
if (Reachable.count(BB))