[llvm] r239688 - [Statepoints] Skip a vector copy when uniquing values.

[Benjamin Kramer]

Author: d0k
Date: Sat Jun 13 14:50:38 2015
New Revision: 239688

URL: http://llvm.org/viewvc/llvm-project?rev=239688&view=rev
Log:
[Statepoints] Skip a vector copy when uniquing values.

No functionality change intended.

Modified:
    llvm/trunk/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp?rev=239688&r1=239687&r2=239688&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp Sat Jun 13 14:50:38 2015
@@ -1659,17 +1659,10 @@ static void relocationViaAlloca(
 /// vector.  Doing so has the effect of changing the output of a couple of
 /// tests in ways which make them less useful in testing fused safepoints.
 template <typename T> static void unique_unsorted(SmallVectorImpl<T> &Vec) {
-  DenseSet<T> Seen;
-  SmallVector<T, 128> TempVec;
-  TempVec.reserve(Vec.size());
-  for (auto Element : Vec)
-    TempVec.push_back(Element);
-  Vec.clear();
-  for (auto V : TempVec) {
-    if (Seen.insert(V).second) {
-      Vec.push_back(V);
-    }
-  }
+  SmallSet<T, 8> Seen;
+  Vec.erase(std::remove_if(Vec.begin(), Vec.end(), [&](const T &V) {
+              return !Seen.insert(V).second;
+            }), Vec.end());
 }
 
 /// Insert holders so that each Value is obviously live through the entire