[llvm] c446f2d - [TableGen] Call std::vector::reserve to preallocate memory before a loop of push_back. NFC

[Craig Topper via llvm-commits]

Author: Craig Topper
Date: 2023-04-18T00:31:38-07:00
New Revision: c446f2dbab1904e22a3c5cdff5513a5c6e39c25c

URL: https://github.com/llvm/llvm-project/commit/c446f2dbab1904e22a3c5cdff5513a5c6e39c25c
DIFF: https://github.com/llvm/llvm-project/commit/c446f2dbab1904e22a3c5cdff5513a5c6e39c25c.diff

LOG: [TableGen] Call std::vector::reserve to preallocate memory before a loop of push_back. NFC

Added: 
    

Modified: 
    llvm/utils/TableGen/CodeGenDAGPatterns.cpp

Removed: 
    


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diff  --git a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
index 46892ad4773f..8bc4203fb035 100644
--- a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
+++ b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
@@ -4516,6 +4516,7 @@ static void CombineChildVariants(
 #endif
     // Create the variant and add it to the output list.
     std::vector<TreePatternNodePtr> NewChildren;
+    NewChildren.reserve(ChildVariants.size());
     for (unsigned i = 0, e = ChildVariants.size(); i != e; ++i)
       NewChildren.push_back(ChildVariants[i][Idxs[i]]);
     TreePatternNodePtr R = makeIntrusiveRefCnt<TreePatternNode>(