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Make SmallVector's grow use memcpy in common cases
instead of std::uninitialized_copy, which uses memmove. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52928 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -15,6 +15,7 @@
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#define LLVM_ADT_SMALLVECTOR_H
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#include "llvm/ADT/iterator.h"
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#include "llvm/Support/type_traits.h"
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#include <algorithm>
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#include <memory>
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@ -349,7 +350,11 @@ void SmallVectorImpl<T>::grow(size_t MinSize) {
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T *NewElts = static_cast<T*>(operator new(NewCapacity*sizeof(T)));
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// Copy the elements over.
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std::uninitialized_copy(Begin, End, NewElts);
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if (is_class<T>::value)
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std::uninitialized_copy(Begin, End, NewElts);
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else
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// Use memcpy for PODs (std::uninitialized_copy optimizes to memmove).
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memcpy(NewElts, Begin, CurSize * sizeof(T));
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// Destroy the original elements.
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destroy_range(Begin, End);
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