Index: include/bits/stl_iterator_base_funcs.h =================================================================== --- include/bits/stl_iterator_base_funcs.h (revision 222041) +++ include/bits/stl_iterator_base_funcs.h (working copy) @@ -107,22 +107,21 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION * n may be negative. * * For random access iterators, this uses their @c + and @c - operations * and are constant time. For other %iterator classes they are linear time. */ template inline typename iterator_traits<_InputIterator>::difference_type distance(_InputIterator __first, _InputIterator __last) { // concept requirements -- taken care of in __distance - return std::__distance(__first, __last, - std::__iterator_category(__first)); + return __distance(__first, __last, std::__iterator_category(__first)); } template inline void __advance(_InputIterator& __i, _Distance __n, input_iterator_tag) { // concept requirements __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) _GLIBCXX_DEBUG_ASSERT(__n >= 0); while (__n--) Index: include/bits/stl_list.h =================================================================== --- include/bits/stl_list.h (revision 222041) +++ include/bits/stl_list.h (working copy) @@ -1861,13 +1861,64 @@ _GLIBCXX_END_NAMESPACE_CXX11 operator>=(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y) { return !(__x < __y); } /// See std::list::swap(). template inline void swap(list<_Tp, _Alloc>& __x, list<_Tp, _Alloc>& __y) { __x.swap(__y); } _GLIBCXX_END_NAMESPACE_CONTAINER + +#if _GLIBCXX_USE_CXX11_ABI +_GLIBCXX_BEGIN_NAMESPACE_VERSION + + // Detect when distance is used to compute the size of the whole list. + template + inline ptrdiff_t + __distance(_GLIBCXX_STD_C::_List_iterator<_Tp> __first, + _GLIBCXX_STD_C::_List_iterator<_Tp> __last, + input_iterator_tag) + { + typedef _GLIBCXX_STD_C::_List_node _Sentinel; + _GLIBCXX_STD_C::_List_iterator<_Tp> __beyond = __last; + ++__beyond; + bool __whole = __first == __beyond; + if (__builtin_constant_p (__whole) && __whole) + return static_cast(__last._M_node)->_M_data; + + ptrdiff_t __n = 0; + while (__first != __last) + { + ++__first; + ++__n; + } + return __n; + } + + template + inline ptrdiff_t + __distance(_GLIBCXX_STD_C::_List_const_iterator<_Tp> __first, + _GLIBCXX_STD_C::_List_const_iterator<_Tp> __last, + input_iterator_tag) + { + typedef _GLIBCXX_STD_C::_List_node _Sentinel; + _GLIBCXX_STD_C::_List_const_iterator<_Tp> __beyond = __last; + ++__beyond; + bool __whole = __first == __beyond; + if (__builtin_constant_p (__whole) && __whole) + return static_cast(__last._M_node)->_M_data; + + ptrdiff_t __n = 0; + while (__first != __last) + { + ++__first; + ++__n; + } + return __n; + } + +_GLIBCXX_END_NAMESPACE_VERSION +#endif } // namespace std #endif /* _STL_LIST_H */ Index: testsuite/23_containers/list/61347.cc =================================================================== --- testsuite/23_containers/list/61347.cc (revision 0) +++ testsuite/23_containers/list/61347.cc (working copy) @@ -0,0 +1,49 @@ +// { dg-options "-std=gnu++11 -O2 -D_GLIBCXX_USE_CXX11_ABI" } + +// Copyright (C) 2015 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the +// terms of the GNU General Public License as published by the +// Free Software Foundation; either version 3, or (at your option) +// any later version. + +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING3. If not see +// . + +#include +#include +#include + +__attribute__((__noinline__, __noclone__)) +void testm(std::list& l) +{ + bool b = std::distance(l.begin(), l.end()) == l.size(); + VERIFY( __builtin_constant_p(b) ); + VERIFY( b ); +} + +__attribute__((__noinline__, __noclone__)) +void testc(const std::list& l) +{ + bool b = std::distance(l.begin(), l.end()) == l.size(); + VERIFY( __builtin_constant_p(b) ); + VERIFY( b ); +} + +int main() +{ + bool test __attribute__((unused)) = true; + +#if _GLIBCXX_USE_DUAL_ABI + std::list l; + testm(l); + testc(l); +#endif +}