fix a warning in TinyPtrVector, adopt it in SSAUpdater, saving some

mallocs.

llvm-svn: 135366

1 files changed, 3 insertions, 3 deletions

diff --git a/llvm/lib/Transforms/Utils/SSAUpdater.cpp b/llvm/lib/Transforms/Utils/SSAUpdater.cpp
index b47a7ccd80b..d2ff8aea384 100644
--- a/llvm/lib/Transforms/Utils/SSAUpdater.cpp
+++ b/llvm/lib/Transforms/Utils/SSAUpdater.cpp
@@ -16,6 +16,7 @@
 #include "llvm/Instructions.h"
 #include "llvm/IntrinsicInst.h"
 #include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/TinyPtrVector.h"
 #include "llvm/Analysis/InstructionSimplify.h"
 #include "llvm/Support/AlignOf.h"
 #include "llvm/Support/Allocator.h"
@@ -378,8 +379,7 @@ run(const SmallVectorImpl<Instruction*> &Insts) const {
   // First step: bucket up uses of the alloca by the block they occur in.
   // This is important because we have to handle multiple defs/uses in a block
   // ourselves: SSAUpdater is purely for cross-block references.
-  // FIXME: Want a TinyVector<Instruction*> since there is often 0/1 element.
-  DenseMap<BasicBlock*, std::vector<Instruction*> > UsesByBlock;
+  DenseMap<BasicBlock*, TinyPtrVector<Instruction*> > UsesByBlock;
   
   for (unsigned i = 0, e = Insts.size(); i != e; ++i) {
     Instruction *User = Insts[i];
@@ -395,7 +395,7 @@ run(const SmallVectorImpl<Instruction*> &Insts) const {
   for (unsigned i = 0, e = Insts.size(); i != e; ++i) {
     Instruction *User = Insts[i];
     BasicBlock *BB = User->getParent();
-    std::vector<Instruction*> &BlockUses = UsesByBlock[BB];
+    TinyPtrVector<Instruction*> &BlockUses = UsesByBlock[BB];
     
     // If this block has already been processed, ignore this repeat use.
     if (BlockUses.empty()) continue;