From bb2e9f23ca266843d58f71e019be1fe7cae0fea5 Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper@sifive.com>
Date: Tue, 11 Apr 2023 00:07:57 -0700
Subject: [PATCH] [TableGen] Call std::vector::reserve to preallocate memory
 before a loop of push_back. NFC

---
 llvm/utils/TableGen/CodeGenDAGPatterns.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
index d4f87d2..3d2883c 100644
--- a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
+++ b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
@@ -2116,6 +2116,7 @@ void TreePatternNode::InlinePatternFragments(
     do {
       // Create the variant and add it to the output list.
       std::vector<TreePatternNodePtr> NewChildren;
+      NewChildren.reserve(ChildAlternatives.size());
       for (unsigned i = 0, e = ChildAlternatives.size(); i != e; ++i)
         NewChildren.push_back(ChildAlternatives[i][Idxs[i]]);
       TreePatternNodePtr R = std::make_shared<TreePatternNode>(
-- 
2.7.4