InstCombine: We know the number of items initially added to the worklist map, reserve space early to avoid rehashing.

llvm-svn: 127089

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/InstCombine/InstCombineWorklist.h b/llvm/lib/Transforms/InstCombine/InstCombineWorklist.h
index 9100a851f16..32009c39ec2 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineWorklist.h
+++ b/llvm/lib/Transforms/InstCombine/InstCombineWorklist.h
@@ -53,6 +53,7 @@ public:
   void AddInitialGroup(Instruction *const *List, unsigned NumEntries) {
     assert(Worklist.empty() && "Worklist must be empty to add initial group");
     Worklist.reserve(NumEntries+16);
+    WorklistMap.resize(NumEntries);
     DEBUG(errs() << "IC: ADDING: " << NumEntries << " instrs to worklist\n");
     for (; NumEntries; --NumEntries) {
       Instruction *I = List[NumEntries-1];