From fa06d75e8df580bcb57418e67dbceb4168586d7f Mon Sep 17 00:00:00 2001
From: Howard Hinnant <hhinnant@apple.com>
Date: Sun, 24 Jul 2011 21:45:06 +0000
Subject: [PATCH] Optimization of string::operator< by M.E. O'Neill.
Discussion in http://llvm.org/bugs/show_bug.cgi?id=10461
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@135893 91177308-0d34-0410-b5e6-96231b3b80d8
---
include/string | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/include/string b/include/string
index 91d6d30d..d1b9a5ea 100644
--- a/include/string
+++ b/include/string
@@ -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>