switch an std::set over to a SmallPtrSet, speeding up mem2reg 6% on 176.gcc.

llvm-svn: 33929

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Utils/PromoteMemoryToRegister.cpp b/llvm/lib/Transforms/Utils/PromoteMemoryToRegister.cpp
index a73e4682a58..39a4c897cfe 100644
--- a/llvm/lib/Transforms/Utils/PromoteMemoryToRegister.cpp
+++ b/llvm/lib/Transforms/Utils/PromoteMemoryToRegister.cpp
@@ -84,7 +84,7 @@ namespace {
 
     /// Visited - The set of basic blocks the renamer has already visited.
     ///
-    std::set<BasicBlock*> Visited;
+    SmallPtrSet<BasicBlock*, 16> Visited;
 
     /// BBNumbers - Contains a stable numbering of basic blocks to avoid
     /// non-determinstic behavior.