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Optimization of string::operator< by M.E. O'Neill. Discussion in http://llvm.org/bugs/show_bug.cgi?id=10461

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@135893 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Howard Hinnant 2011-07-24 21:45:06 +00:00
parent 2644a7b3da
commit fa06d75e8d
1 changed files with 11 additions and 1 deletions
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12
include/string
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@ -3392,7 +3392,17 @@ _LIBCPP_INLINE_VISIBILITY inline
int
basic_string<_CharT, _Traits, _Allocator>::compare(const basic_string& __str) const _NOEXCEPT
{
return compare(0, npos, __str.data(), __str.size());
size_t __lhs_sz = size();
size_t __rhs_sz = __str.size();
int __result = traits_type::compare(data(), __str.data(),
_VSTD::min(__lhs_sz, __rhs_sz));
if (__result != 0)
return __result;
if (__lhs_sz < __rhs_sz)
return -1;
if (__lhs_sz > __rhs_sz)
return 1;
return 0;
}
template <class _CharT, class _Traits, class _Allocator>