[TableGen] CodeGenDAGPatterns::GenerateVariants - use BitVector::push_back()

As mentioned on D52236, this saves 10secs in debug builds of x86 -gen-dag-isel

llvm-svn: 342536

1 files changed, 1 insertions, 2 deletions

diff --git a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
index 8b9253499af..52a83100b83 100644
--- a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
+++ b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
@@ -4552,9 +4552,8 @@ void CodeGenDAGPatterns::GenerateVariants() {
       MatchedPredicates.push_back(Matches);
 
       // Add a new match the same as this pattern.
-      unsigned NumPatterns = PatternsToMatch.size();
       for (auto &P : MatchedPredicates)
-        P.resize(NumPatterns, P[i]);
+        P.push_back(P[i]);
     }
 
     LLVM_DEBUG(errs() << "\n");