[llvm] ef5ba2e - [NFC] Reserve the number of operands before push_back (#106234)

[via llvm-commits]

Author: Nabeel Omer
Date: 2024-08-27T17:10:14+01:00
New Revision: ef5ba2ede79f759ff8eaad222dca36aa5f1871c3

URL: https://github.com/llvm/llvm-project/commit/ef5ba2ede79f759ff8eaad222dca36aa5f1871c3
DIFF: https://github.com/llvm/llvm-project/commit/ef5ba2ede79f759ff8eaad222dca36aa5f1871c3.diff

LOG: [NFC] Reserve the number of operands before push_back (#106234)

This reduces the number of allocations inside the loop.

Partially addresses #105836

Added: 
    

Modified: 
    llvm/lib/IR/ConstantsContext.h

Removed: 
    


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diff  --git a/llvm/lib/IR/ConstantsContext.h b/llvm/lib/IR/ConstantsContext.h
index 2d12723a2329df..acf05379e8a2a6 100644
--- a/llvm/lib/IR/ConstantsContext.h
+++ b/llvm/lib/IR/ConstantsContext.h
@@ -292,6 +292,7 @@ template <class ConstantClass> struct ConstantAggrKeyType {
   ConstantAggrKeyType(const ConstantClass *C,
                       SmallVectorImpl<Constant *> &Storage) {
     assert(Storage.empty() && "Expected empty storage");
+    Storage.reserve(C->getNumOperands());
     for (unsigned I = 0, E = C->getNumOperands(); I != E; ++I)
       Storage.push_back(C->getOperand(I));
     Operands = Storage;