From 7f86bb0a713cbd2643c4ed5da9bd92d9b24eaa72 Mon Sep 17 00:00:00 2001
From: Gregory Alfonso <gfunni234@gmail.com>
Date: Thu, 8 Dec 2022 08:42:50 +0000
Subject: [llvm] Call reserve before push_back in a loop

It is generally good practice, if you know how big the vector is going to be in the end, to reserve before continually calling "push_back" or "emplace_back"

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D139483
---
 llvm/lib/Support/VirtualFileSystem.cpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'llvm/lib/Support/VirtualFileSystem.cpp')

diff --git a/llvm/lib/Support/VirtualFileSystem.cpp b/llvm/lib/Support/VirtualFileSystem.cpp
index ace58270ef94..ded5607e0c53 100644
--- a/llvm/lib/Support/VirtualFileSystem.cpp
+++ b/llvm/lib/Support/VirtualFileSystem.cpp
@@ -1506,6 +1506,7 @@ void RedirectingFileSystem::setRedirection(
 
 std::vector<StringRef> RedirectingFileSystem::getRoots() const {
   std::vector<StringRef> R;
+  R.reserve(Roots.size());
   for (const auto &Root : Roots)
     R.push_back(Root->getName());
   return R;
-- 
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