Switch SelectionDAG::ReplaceAllUsesOfValueWith to use a SmallSetVector for
the users set (most nodes have 1 or 2 users). This speeds up the isel pass
3.2% on kimwitu.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33849 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 24b49b2..cced06b 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2409,8 +2409,9 @@
return;
}
- // Get all of the users in a nice, deterministically ordered, uniqued set.
- SetVector<SDNode*> Users(From.Val->use_begin(), From.Val->use_end());
+ // Get all of the users of From.Val. We want these in a nice,
+ // deterministically ordered and uniqued set, so we use a SmallSetVector.
+ SmallSetVector<SDNode*, 16> Users(From.Val->use_begin(), From.Val->use_end());
while (!Users.empty()) {
// We know that this user uses some value of From. If it is the right