[llvm-commits] [llvm] r52926 - /llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

[Dan Gohman]

Author: djg
Date: Mon Jun 30 16:04:06 2008
New Revision: 52926

URL: http://llvm.org/viewvc/llvm-project?rev=52926&view=rev
Log:
Use reserve.

SelectionDAG::allnodes_size is linear, but that doesn't appear to
outweigh the benefit of reducing heap traffic. If it does become a
problem, we should teach SelectionDAG to keep a count of how many
nodes are live, because there are several other places where that
information would be useful as well.

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp?rev=52926&r1=52925&r2=52926&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Mon Jun 30 16:04:06 2008
@@ -592,6 +592,7 @@
   AfterLegalize = RunningAfterLegalize;
 
   // Add all the dag nodes to the worklist.
+  WorkList.reserve(DAG.allnodes_size());
   for (SelectionDAG::allnodes_iterator I = DAG.allnodes_begin(),
        E = DAG.allnodes_end(); I != E; ++I)
     WorkList.push_back(I);