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Implement a few optimizations for vector push_back and insert. Fixes r10828365.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@150542 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Howard Hinnant
2012-02-15 00:41:34 +00:00
parent 5f3f35fe64
commit b0bfd9bdd6
3 changed files with 103 additions and 26 deletions
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10
include/__split_buffer
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@@ -95,7 +95,7 @@ public:
void reserve(size_type __n);
void shrink_to_fit() _NOEXCEPT;
void push_front(const_reference __x);
void push_back(const_reference __x);
_LIBCPP_INLINE_VISIBILITY void push_back(const_reference __x);
#if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
void push_front(value_type&& __x);
void push_back(value_type&& __x);
@@ -133,8 +133,10 @@ public:
_LIBCPP_INLINE_VISIBILITY
void __destruct_at_end(pointer __new_last) _NOEXCEPT
{__destruct_at_end(__new_last, is_trivially_destructible<value_type>());}
{__destruct_at_end(__new_last, false_type());}
_LIBCPP_INLINE_VISIBILITY
void __destruct_at_end(pointer __new_last, false_type) _NOEXCEPT;
_LIBCPP_INLINE_VISIBILITY
void __destruct_at_end(pointer __new_last, true_type) _NOEXCEPT;
void swap(__split_buffer& __x)
@@ -287,7 +289,7 @@ _LIBCPP_INLINE_VISIBILITY inline
void
__split_buffer<_Tp, _Allocator>::__destruct_at_begin(pointer __new_begin, false_type)
{
while (__begin_ < __new_begin)
while (__begin_ != __new_begin)
__alloc_traits::destroy(__alloc(), __begin_++);
}
@@ -304,7 +306,7 @@ _LIBCPP_INLINE_VISIBILITY inline
void
__split_buffer<_Tp, _Allocator>::__destruct_at_end(pointer __new_last, false_type) _NOEXCEPT
{
while (__new_last < __end_)
while (__new_last != __end_)
__alloc_traits::destroy(__alloc(), --__end_);
}