[gcc(refs/users/guojiufu/heads/guojiufu-branch)] libstdc++: Extend memcmp optimization in std::lexicographical_compare
Jiu Fu Guo
guojiufu@gcc.gnu.org
Sat Jun 13 02:52:54 GMT 2020
https://gcc.gnu.org/g:3a391adf7a38780f8d01dbac08a2a143fc80b469
commit 3a391adf7a38780f8d01dbac08a2a143fc80b469
Author: François Dumont <fdumont@gcc.gnu.org>
Date: Wed Jun 10 17:48:46 2020 +0100
libstdc++: Extend memcmp optimization in std::lexicographical_compare
Make the memcmp optimization work for std::deque iterators and safe
iterators.
Co-authored-by: Jonathan Wakely <jwakely@redhat.com>
libstdc++-v3/ChangeLog:
2020-06-08 François Dumont <fdumont@gcc.gnu.org>
Jonathan Wakely <jwakely@redhat.com>
* include/bits/deque.tcc (__lex_cmp_dit): New.
(__lexicographical_compare_aux1): Define overloads for deque
iterators.
* include/bits/stl_algobase.h (__lexicographical_compare::__3way):
New static member function.
(__lexicographical_compare<true>::__3way): Likewise.
(__lexicographical_compare<true>::__lc): Use __3way.
(__lexicographical_compare_aux): Rename to
__lexicographical_compare_aux1 and declare overloads for deque
iterators.
(__lexicographical_compare_aux): Define new forwarding function
that calls __lexicographical_compare_aux1 and declare new overloads
for safe iterators.
(lexicographical_compare): Do not use __niter_base on
parameters.
* include/debug/safe_iterator.tcc
(__lexicographical_compare_aux): Define overloads for safe
iterators.
* testsuite/25_algorithms/lexicographical_compare/1.cc: Add
checks with random access iterators.
* testsuite/25_algorithms/lexicographical_compare/deque_iterators/1.cc:
New test.
Diff:
---
libstdc++-v3/include/bits/deque.tcc | 103 +++++++
libstdc++-v3/include/bits/stl_algobase.h | 101 ++++++-
libstdc++-v3/include/debug/safe_iterator.tcc | 74 +++++
.../25_algorithms/lexicographical_compare/1.cc | 45 ++-
.../lexicographical_compare/deque_iterators/1.cc | 301 +++++++++++++++++++++
5 files changed, 606 insertions(+), 18 deletions(-)
diff --git a/libstdc++-v3/include/bits/deque.tcc b/libstdc++-v3/include/bits/deque.tcc
index 1d32a1691c7..7d1ec86456a 100644
--- a/libstdc++-v3/include/bits/deque.tcc
+++ b/libstdc++-v3/include/bits/deque.tcc
@@ -1261,6 +1261,109 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
return true;
}
+ template<typename _Tp1, typename _Ref, typename _Ptr, typename _Tp2>
+ int
+ __lex_cmp_dit(
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref, _Ptr> __first1,
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref, _Ptr> __last1,
+ const _Tp2* __first2, const _Tp2* __last2)
+ {
+ const bool __simple =
+ (__is_byte<_Tp1>::__value && __is_byte<_Tp2>::__value
+ && !__gnu_cxx::__numeric_traits<_Tp1>::__is_signed
+ && !__gnu_cxx::__numeric_traits<_Tp2>::__is_signed
+ && __is_pointer<_Ptr>::__value
+#if __cplusplus > 201703L && __cpp_lib_concepts
+ // For C++20 iterator_traits<volatile T*>::value_type is non-volatile
+ // so __is_byte<T> could be true, but we can't use memcmp with
+ // volatile data.
+ && !is_volatile_v<_Tp1>
+ && !is_volatile_v<_Tp2>
+#endif
+ );
+ typedef std::__lexicographical_compare<__simple> _Lc;
+
+ while (__first1._M_node != __last1._M_node)
+ {
+ const ptrdiff_t __len1 = __first1._M_last - __first1._M_cur;
+ const ptrdiff_t __len2 = __last2 - __first2;
+ const ptrdiff_t __len = std::min(__len1, __len2);
+ // if __len1 > __len2 this will return a positive value:
+ if (int __ret = _Lc::__3way(__first1._M_cur, __first1._M_last,
+ __first2, __first2 + __len))
+ return __ret;
+
+ __first1 += __len;
+ __first2 += __len;
+ }
+ return _Lc::__3way(__first1._M_cur, __last1._M_cur,
+ __first2, __last2);
+ }
+
+ template<typename _Tp1, typename _Ref1, typename _Ptr1,
+ typename _Tp2>
+ inline bool
+ __lexicographical_compare_aux1(
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref1, _Ptr1> __first1,
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref1, _Ptr1> __last1,
+ _Tp2* __first2, _Tp2* __last2)
+ { return std::__lex_cmp_dit(__first1, __last1, __first2, __last2) < 0; }
+
+ template<typename _Tp1,
+ typename _Tp2, typename _Ref2, typename _Ptr2>
+ inline bool
+ __lexicographical_compare_aux1(_Tp1* __first1, _Tp1* __last1,
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp2, _Ref2, _Ptr2> __first2,
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp2, _Ref2, _Ptr2> __last2)
+ { return std::__lex_cmp_dit(__first2, __last2, __first1, __last1) > 0; }
+
+ template<typename _Tp1, typename _Ref1, typename _Ptr1,
+ typename _Tp2, typename _Ref2, typename _Ptr2>
+ inline bool
+ __lexicographical_compare_aux1(
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref1, _Ptr1> __first1,
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref1, _Ptr1> __last1,
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp2, _Ref2, _Ptr2> __first2,
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp2, _Ref2, _Ptr2> __last2)
+ {
+ const bool __simple =
+ (__is_byte<_Tp1>::__value && __is_byte<_Tp2>::__value
+ && !__gnu_cxx::__numeric_traits<_Tp1>::__is_signed
+ && !__gnu_cxx::__numeric_traits<_Tp2>::__is_signed
+ && __is_pointer<_Ptr1>::__value
+ && __is_pointer<_Ptr2>::__value
+#if __cplusplus > 201703L && __cpp_lib_concepts
+ // For C++20 iterator_traits<volatile T*>::value_type is non-volatile
+ // so __is_byte<T> could be true, but we can't use memcmp with
+ // volatile data.
+ && !is_volatile_v<_Tp1>
+ && !is_volatile_v<_Tp2>
+#endif
+ );
+ typedef std::__lexicographical_compare<__simple> _Lc;
+
+ while (__first1 != __last1)
+ {
+ const ptrdiff_t __len2 = __first2._M_node == __last2._M_node
+ ? __last2._M_cur - __first2._M_cur
+ : __first2._M_last - __first2._M_cur;
+ if (__len2 == 0)
+ return false;
+ const ptrdiff_t __len1 = __first1._M_node == __last1._M_node
+ ? __last1._M_cur - __first1._M_cur
+ : __first1._M_last - __first1._M_cur;
+ const ptrdiff_t __len = std::min(__len1, __len2);
+ if (int __ret = _Lc::__3way(__first1._M_cur, __first1._M_cur + __len,
+ __first2._M_cur, __first2._M_cur + __len))
+ return __ret < 0;
+
+ __first1 += __len;
+ __first2 += __len;
+ }
+
+ return __last2 != __first2;
+ }
+
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
diff --git a/libstdc++-v3/include/bits/stl_algobase.h b/libstdc++-v3/include/bits/stl_algobase.h
index 0163d8f902d..41dd740d34a 100644
--- a/libstdc++-v3/include/bits/stl_algobase.h
+++ b/libstdc++-v3/include/bits/stl_algobase.h
@@ -1313,6 +1313,25 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
__first2, __last2,
__iter_less_iter());
}
+
+ template<typename _II1, typename _II2>
+ _GLIBCXX20_CONSTEXPR
+ static int
+ __3way(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
+ {
+ while (__first1 != __last1)
+ {
+ if (__first2 == __last2)
+ return +1;
+ if (*__first1 < *__first2)
+ return -1;
+ if (*__first2 < *__first1)
+ return +1;
+ ++__first1;
+ ++__first2;
+ }
+ return int(__first2 == __last2) - 1;
+ }
};
template<>
@@ -1323,21 +1342,28 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
static bool
__lc(const _Tp* __first1, const _Tp* __last1,
const _Up* __first2, const _Up* __last2)
+ { return __3way(__first1, __last1, __first2, __last2) < 0; }
+
+ template<typename _Tp, typename _Up>
+ _GLIBCXX20_CONSTEXPR
+ static ptrdiff_t
+ __3way(const _Tp* __first1, const _Tp* __last1,
+ const _Up* __first2, const _Up* __last2)
{
const size_t __len1 = __last1 - __first1;
const size_t __len2 = __last2 - __first2;
if (const size_t __len = std::min(__len1, __len2))
if (int __result = std::__memcmp(__first1, __first2, __len))
- return __result < 0;
- return __len1 < __len2;
+ return __result;
+ return ptrdiff_t(__len1 - __len2);
}
};
template<typename _II1, typename _II2>
_GLIBCXX20_CONSTEXPR
inline bool
- __lexicographical_compare_aux(_II1 __first1, _II1 __last1,
- _II2 __first2, _II2 __last2)
+ __lexicographical_compare_aux1(_II1 __first1, _II1 __last1,
+ _II2 __first2, _II2 __last2)
{
typedef typename iterator_traits<_II1>::value_type _ValueType1;
typedef typename iterator_traits<_II2>::value_type _ValueType2;
@@ -1360,6 +1386,67 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
__first2, __last2);
}
+ template<typename _Tp1, typename _Ref1, typename _Ptr1,
+ typename _Tp2>
+ bool
+ __lexicographical_compare_aux1(
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref1, _Ptr1>,
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref1, _Ptr1>,
+ _Tp2*, _Tp2*);
+
+ template<typename _Tp1,
+ typename _Tp2, typename _Ref2, typename _Ptr2>
+ bool
+ __lexicographical_compare_aux1(_Tp1*, _Tp1*,
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp2, _Ref2, _Ptr2>,
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp2, _Ref2, _Ptr2>);
+
+ template<typename _Tp1, typename _Ref1, typename _Ptr1,
+ typename _Tp2, typename _Ref2, typename _Ptr2>
+ bool
+ __lexicographical_compare_aux1(
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref1, _Ptr1>,
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref1, _Ptr1>,
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp2, _Ref2, _Ptr2>,
+ _GLIBCXX_STD_C::_Deque_iterator<_Tp2, _Ref2, _Ptr2>);
+
+ template<typename _II1, typename _II2>
+ _GLIBCXX20_CONSTEXPR
+ inline bool
+ __lexicographical_compare_aux(_II1 __first1, _II1 __last1,
+ _II2 __first2, _II2 __last2)
+ {
+ return std::__lexicographical_compare_aux1(std::__niter_base(__first1),
+ std::__niter_base(__last1),
+ std::__niter_base(__first2),
+ std::__niter_base(__last2));
+ }
+
+ template<typename _Iter1, typename _Seq1, typename _Cat1,
+ typename _II2>
+ bool
+ __lexicographical_compare_aux(
+ const ::__gnu_debug::_Safe_iterator<_Iter1, _Seq1, _Cat1>&,
+ const ::__gnu_debug::_Safe_iterator<_Iter1, _Seq1, _Cat1>&,
+ _II2, _II2);
+
+ template<typename _II1,
+ typename _Iter2, typename _Seq2, typename _Cat2>
+ bool
+ __lexicographical_compare_aux(
+ _II1, _II1,
+ const ::__gnu_debug::_Safe_iterator<_Iter2, _Seq2, _Cat2>&,
+ const ::__gnu_debug::_Safe_iterator<_Iter2, _Seq2, _Cat2>&);
+
+ template<typename _Iter1, typename _Seq1, typename _Cat1,
+ typename _Iter2, typename _Seq2, typename _Cat2>
+ bool
+ __lexicographical_compare_aux(
+ const ::__gnu_debug::_Safe_iterator<_Iter1, _Seq1, _Cat1>&,
+ const ::__gnu_debug::_Safe_iterator<_Iter1, _Seq1, _Cat1>&,
+ const ::__gnu_debug::_Safe_iterator<_Iter2, _Seq2, _Cat2>&,
+ const ::__gnu_debug::_Safe_iterator<_Iter2, _Seq2, _Cat2>&);
+
template<typename _ForwardIterator, typename _Tp, typename _Compare>
_GLIBCXX20_CONSTEXPR
_ForwardIterator
@@ -1659,10 +1746,8 @@ _GLIBCXX_BEGIN_NAMESPACE_ALGO
__glibcxx_requires_valid_range(__first1, __last1);
__glibcxx_requires_valid_range(__first2, __last2);
- return std::__lexicographical_compare_aux(std::__niter_base(__first1),
- std::__niter_base(__last1),
- std::__niter_base(__first2),
- std::__niter_base(__last2));
+ return std::__lexicographical_compare_aux(__first1, __last1,
+ __first2, __last2);
}
/**
diff --git a/libstdc++-v3/include/debug/safe_iterator.tcc b/libstdc++-v3/include/debug/safe_iterator.tcc
index 888ac803ae5..f694e514239 100644
--- a/libstdc++-v3/include/debug/safe_iterator.tcc
+++ b/libstdc++-v3/include/debug/safe_iterator.tcc
@@ -470,6 +470,80 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
return __equal_aux1(__first1, __last1, __first2);
}
+ template<typename _Ite1, typename _Seq1, typename _Cat1,
+ typename _II2>
+ bool
+ __lexicographical_compare_aux(
+ const ::__gnu_debug::_Safe_iterator<_Ite1, _Seq1, _Cat1>& __first1,
+ const ::__gnu_debug::_Safe_iterator<_Ite1, _Seq1, _Cat1>& __last1,
+ _II2 __first2, _II2 __last2)
+ {
+ typename ::__gnu_debug::_Distance_traits<_Ite1>::__type __dist1;
+ __glibcxx_check_valid_range2(__first1, __last1, __dist1);
+ __glibcxx_check_valid_range(__first2, __last2);
+
+ if (__dist1.second > ::__gnu_debug::__dp_equality)
+ return std::__lexicographical_compare_aux(__first1.base(),
+ __last1.base(),
+ __first2, __last2);
+ return std::__lexicographical_compare_aux1(__first1, __last1,
+ __first2, __last2);
+ }
+
+ template<typename _II1,
+ typename _Ite2, typename _Seq2, typename _Cat2>
+ bool
+ __lexicographical_compare_aux(
+ _II1 __first1, _II1 __last1,
+ const ::__gnu_debug::_Safe_iterator<_Ite2, _Seq2, _Cat2>& __first2,
+ const ::__gnu_debug::_Safe_iterator<_Ite2, _Seq2, _Cat2>& __last2)
+ {
+ __glibcxx_check_valid_range(__first1, __last1);
+ typename ::__gnu_debug::_Distance_traits<_II1>::__type __dist2;
+ __glibcxx_check_valid_range2(__first2, __last2, __dist2);
+
+ if (__dist2.second > ::__gnu_debug::__dp_equality)
+ return std::__lexicographical_compare_aux(__first1, __last1,
+ __first2.base(),
+ __last2.base());
+ return std::__lexicographical_compare_aux1(__first1, __last1,
+ __first2, __last2);
+ }
+
+ template<typename _Ite1, typename _Seq1, typename _Cat1,
+ typename _Ite2, typename _Seq2, typename _Cat2>
+ bool
+ __lexicographical_compare_aux(
+ const ::__gnu_debug::_Safe_iterator<_Ite1, _Seq1, _Cat1>& __first1,
+ const ::__gnu_debug::_Safe_iterator<_Ite1, _Seq1, _Cat1>& __last1,
+ const ::__gnu_debug::_Safe_iterator<_Ite2, _Seq2, _Cat2>& __first2,
+ const ::__gnu_debug::_Safe_iterator<_Ite2, _Seq2, _Cat2>& __last2)
+ {
+ typename ::__gnu_debug::_Distance_traits<_Ite1>::__type __dist1;
+ __glibcxx_check_valid_range2(__first1, __last1, __dist1);
+ typename ::__gnu_debug::_Distance_traits<_Ite2>::__type __dist2;
+ __glibcxx_check_valid_range2(__first2, __last2, __dist2);
+
+ if (__dist1.second > ::__gnu_debug::__dp_equality)
+ {
+ if (__dist2.second > ::__gnu_debug::__dp_equality)
+ return std::__lexicographical_compare_aux(__first1.base(),
+ __last1.base(),
+ __first2.base(),
+ __last2.base());
+ return std::__lexicographical_compare_aux(__first1.base(),
+ __last1.base(),
+ __first2, __last2);
+ }
+
+ if (__dist2.second > ::__gnu_debug::__dp_equality)
+ return std::__lexicographical_compare_aux(__first1, __last1,
+ __first2.base(),
+ __last2.base());
+ return std::__lexicographical_compare_aux1(__first1, __last1,
+ __first2, __last2);
+ }
+
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
diff --git a/libstdc++-v3/testsuite/25_algorithms/lexicographical_compare/1.cc b/libstdc++-v3/testsuite/25_algorithms/lexicographical_compare/1.cc
index 8c2f043f943..9bbc83b7af0 100644
--- a/libstdc++-v3/testsuite/25_algorithms/lexicographical_compare/1.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/lexicographical_compare/1.cc
@@ -29,43 +29,43 @@ int array1[] = {0, 1};
int array2[] = {1, 0};
int array3[] = {1, 0, 1};
-void
+void
test1()
{
Container con1(array1, array1);
Container con2(array2, array2);
- VERIFY( !std::lexicographical_compare(con1.begin(), con1.end(),
+ VERIFY( !std::lexicographical_compare(con1.begin(), con1.end(),
con2.begin(), con2.end()) );
}
-void
+void
test2()
{
Container con1(array1, array1 + 2);
Container con2(array2, array2 + 2);
- VERIFY( std::lexicographical_compare(con1.begin(), con1.end(),
+ VERIFY( std::lexicographical_compare(con1.begin(), con1.end(),
con2.begin(), con2.end()) );
}
-void
+void
test3()
{
Container con1(array1, array1 + 2);
Container con2(array2, array2 + 2);
- VERIFY( !std::lexicographical_compare(con2.begin(), con2.end(),
+ VERIFY( !std::lexicographical_compare(con2.begin(), con2.end(),
con1.begin(), con1.end()) );
}
-void
+void
test4()
{
Container con3(array3, array3 + 3);
Container con2(array2, array2 + 2);
- VERIFY( std::lexicographical_compare(con2.begin(), con2.end(),
+ VERIFY( std::lexicographical_compare(con2.begin(), con2.end(),
con3.begin(), con3.end()) );
}
-void
+void
test5()
{
Container con3(array3, array3 + 3);
@@ -74,7 +74,30 @@ test5()
con2.begin(), con2.end()) );
}
-int
+void
+test6()
+{
+ VERIFY( std::lexicographical_compare(array2, array2 + 2,
+ array3, array3 + 3) );
+ VERIFY( !std::lexicographical_compare(array3, array3 + 3,
+ array2, array2 + 2) );
+}
+
+using __gnu_test::random_access_iterator_wrapper;
+typedef test_container<int, random_access_iterator_wrapper> RaiContainer;
+
+void
+test7()
+{
+ RaiContainer con2(array2, array2 + 2);
+ RaiContainer con3(array3, array3 + 3);
+ VERIFY( std::lexicographical_compare(con2.begin(), con2.end(),
+ con3.begin(), con3.end()) );
+ VERIFY( !std::lexicographical_compare(con3.begin(), con3.end(),
+ con2.begin(), con2.end()) );
+}
+
+int
main()
{
test1();
@@ -82,4 +105,6 @@ main()
test3();
test4();
test5();
+ test6();
+ test7();
}
diff --git a/libstdc++-v3/testsuite/25_algorithms/lexicographical_compare/deque_iterators/1.cc b/libstdc++-v3/testsuite/25_algorithms/lexicographical_compare/deque_iterators/1.cc
new file mode 100644
index 00000000000..14a75358db4
--- /dev/null
+++ b/libstdc++-v3/testsuite/25_algorithms/lexicographical_compare/deque_iterators/1.cc
@@ -0,0 +1,301 @@
+// Copyright (C) 2020 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
+// <http://www.gnu.org/licenses/>.
+
+#include <algorithm>
+#include <vector>
+#include <deque>
+
+#include <ext/new_allocator.h>
+#include <ext/malloc_allocator.h>
+
+#include <testsuite_hooks.h>
+
+void test01()
+{
+ using namespace std;
+
+ deque<int> d;
+ for (int i = 0; i != _GLIBCXX_STD_C::__deque_buf_size(sizeof(int)); ++i)
+ d.push_back(i);
+
+ const deque<int>& cd = d;
+
+ VERIFY( !lexicographical_compare(cd.begin(), cd.end(), cd.begin(), cd.end()) );
+ VERIFY( !lexicographical_compare(cd.begin(), cd.end(), d.begin(), d.end()) );
+ VERIFY( !lexicographical_compare(d.begin(), d.end(), d.begin(), d.end()) );
+ VERIFY( !lexicographical_compare(d.begin(), d.end(), cd.begin(), cd.end()) );
+
+ const deque<int>::iterator first = d.begin(), last = d.end();
+ VERIFY( lexicographical_compare(first, last - 1, first, last) );
+ VERIFY( !lexicographical_compare(first, last, first, last - 1) );
+ VERIFY( lexicographical_compare(first, last, first + 1, last) );
+ VERIFY( !lexicographical_compare(first + 1, last, first, last) );
+}
+
+void test02()
+{
+ using namespace std;
+
+ deque<int> d;
+ for (int i = 0; i != 1000; ++i)
+ d.push_back(i % 10);
+
+ VERIFY( lexicographical_compare(d.begin(), d.begin() + 10,
+ d.begin() + 21, d.begin() + 31) );
+ VERIFY( lexicographical_compare(d.begin(), d.begin() + 10,
+ d.begin() + 20, d.begin() + 31) );
+ VERIFY( ! lexicographical_compare(d.begin() + 1, d.begin() + 10,
+ d.begin() + 21, d.begin() + 30) );
+ VERIFY( !lexicographical_compare(d.begin(), d.begin() + 10,
+ d.begin() + 20, d.begin() + 30) );
+ VERIFY( !lexicographical_compare(d.begin() + 1, d.begin() + 10,
+ d.begin() + 1 + 20, d.begin() + 30) );
+ VERIFY( lexicographical_compare(d.begin(), d.begin() + 10,
+ d.begin() + 20, d.begin() + 31) );
+ VERIFY( !lexicographical_compare(d.begin() + 10, d.end() - 10,
+ d.begin(), d.end() - 20) );
+
+ const deque<int>& cd = d;
+
+ VERIFY( lexicographical_compare(cd.begin(), cd.begin() + 10,
+ cd.begin() + 21, cd.begin() + 31) );
+ VERIFY( lexicographical_compare(cd.begin() + 1, cd.begin() + 10,
+ cd.begin() + 21, cd.begin() + 32) );
+ VERIFY( !lexicographical_compare(cd.begin(), cd.begin() + 10,
+ cd.begin() + 20, cd.begin() + 30) );
+ VERIFY( !lexicographical_compare(cd.begin() + 1, cd.begin() + 10,
+ cd.begin() + 21, cd.begin() + 30) );
+ VERIFY( !lexicographical_compare(cd.begin() + 10, cd.end() - 10,
+ d.begin(), d.end() - 20) );
+ VERIFY( !lexicographical_compare(d.begin() + 10, d.end() - 10,
+ cd.begin(), cd.end() - 20) );
+}
+
+void test03()
+{
+ using namespace std;
+
+ deque<int> d1;
+ for (int i = 0; i != 1000; ++i)
+ d1.push_back(i % 10);
+
+ deque<int> d2(d1);
+ for (int i = 0; i != 10; ++i)
+ d2.pop_front();
+
+ VERIFY( !lexicographical_compare(d1.begin(), d1.begin() + 10,
+ d2.begin(), d2.begin() + 10) );
+ VERIFY( !lexicographical_compare(d1.begin() + 10, d1.end() - 10,
+ d2.begin(), d2.end() - 10) );
+
+ const deque<int>& cd1 = d1;
+ const deque<int>& cd2 = d2;
+
+ VERIFY( !lexicographical_compare(cd1.begin(), cd1.begin() + 10,
+ cd2.begin() + 20, cd2.begin() + 30) );
+ VERIFY( !lexicographical_compare(cd1.begin() + 10, cd1.end() - 10,
+ d2.begin(), d2.end() - 10) );
+ VERIFY( lexicographical_compare(cd2.begin() + 10, cd2.end() - 10,
+ cd1.begin(), cd1.end() - 20) );
+}
+
+void test04()
+{
+ using namespace std;
+
+ deque<int> d;
+ for (int i = 0; i != 1024; ++i)
+ d.push_back(i);
+
+ vector<int> v(d.begin(), d.end());
+
+ VERIFY( lexicographical_compare(d.begin() + 5, d.end() - 1, v.begin() + 5, v.end()) );
+ VERIFY( !lexicographical_compare(v.begin(), v.end(), d.begin(), d.end()) );
+
+ const deque<int>& cd = d;
+
+ VERIFY( !lexicographical_compare(cd.begin(), cd.end(), v.begin(), v.end()) );
+ VERIFY( !lexicographical_compare(v.begin(), v.end(), cd.begin(), cd.end()) );
+}
+
+void test05()
+{
+ using namespace std;
+
+ int a[] = { 0, 1, 2, 3, 4 };
+ deque<int, __gnu_cxx::new_allocator<int> > d1(a, a + 5);
+ deque<int, __gnu_cxx::malloc_allocator<int> > d2(a, a + 5);
+
+ VERIFY( !lexicographical_compare(d1.begin(), d1.end(), d2.begin(), d2.end()) );
+}
+
+void
+test06()
+{
+ using namespace std;
+
+ deque<int> d;
+ int i = 0;
+ VERIFY( lexicographical_compare(d.begin(), d.end(), &i, &i + 1) );
+ VERIFY( !lexicographical_compare(&i, &i + 1, d.begin(), d.end()) );
+}
+
+void test07()
+{
+ using namespace std;
+
+ deque<unsigned char> d;
+ for (int i = 0; i != _GLIBCXX_STD_C::__deque_buf_size(sizeof(int)); ++i)
+ d.push_back(i);
+
+ const deque<unsigned char>& cd = d;
+
+ VERIFY( !lexicographical_compare(cd.begin(), cd.end(), cd.begin(), cd.end()) );
+ VERIFY( !lexicographical_compare(cd.begin(), cd.end(), d.begin(), d.end()) );
+ VERIFY( !lexicographical_compare(d.begin(), d.end(), d.begin(), d.end()) );
+ VERIFY( !lexicographical_compare(d.begin(), d.end(), cd.begin(), cd.end()) );
+
+ const deque<unsigned char>::iterator first = d.begin(), last = d.end();
+ VERIFY( lexicographical_compare(first, last - 1, first, last) );
+ VERIFY( !lexicographical_compare(first, last, first, last - 1) );
+ VERIFY( lexicographical_compare(first, last, first + 1, last) );
+ VERIFY( !lexicographical_compare(first + 1, last, first, last) );
+}
+
+void test08()
+{
+ using namespace std;
+
+ deque<unsigned char> d;
+ for (int i = 0; i != 1000; ++i)
+ d.push_back(i % 10);
+
+ VERIFY( lexicographical_compare(d.begin(), d.begin() + 10,
+ d.begin() + 21, d.begin() + 31) );
+ VERIFY( lexicographical_compare(d.begin(), d.begin() + 10,
+ d.begin() + 20, d.begin() + 31) );
+ VERIFY( ! lexicographical_compare(d.begin() + 1, d.begin() + 10,
+ d.begin() + 21, d.begin() + 30) );
+ VERIFY( !lexicographical_compare(d.begin(), d.begin() + 10,
+ d.begin() + 20, d.begin() + 30) );
+ VERIFY( !lexicographical_compare(d.begin() + 1, d.begin() + 10,
+ d.begin() + 1 + 20, d.begin() + 30) );
+ VERIFY( lexicographical_compare(d.begin(), d.begin() + 10,
+ d.begin() + 20, d.begin() + 31) );
+ VERIFY( !lexicographical_compare(d.begin() + 10, d.end() - 10,
+ d.begin(), d.end() - 20) );
+
+ const deque<unsigned char>& cd = d;
+
+ VERIFY( lexicographical_compare(cd.begin(), cd.begin() + 10,
+ cd.begin() + 21, cd.begin() + 31) );
+ VERIFY( lexicographical_compare(cd.begin() + 1, cd.begin() + 10,
+ cd.begin() + 21, cd.begin() + 32) );
+ VERIFY( !lexicographical_compare(cd.begin(), cd.begin() + 10,
+ cd.begin() + 20, cd.begin() + 30) );
+ VERIFY( !lexicographical_compare(cd.begin() + 1, cd.begin() + 10,
+ cd.begin() + 21, cd.begin() + 30) );
+ VERIFY( !lexicographical_compare(cd.begin() + 10, cd.end() - 10,
+ d.begin(), d.end() - 20) );
+ VERIFY( !lexicographical_compare(d.begin() + 10, d.end() - 10,
+ cd.begin(), cd.end() - 20) );
+}
+
+void test09()
+{
+ using namespace std;
+
+ deque<unsigned char> d1;
+ for (int i = 0; i != 1000; ++i)
+ d1.push_back(i % 10);
+
+ deque<unsigned char> d2(d1);
+ for (int i = 0; i != 10; ++i)
+ d2.pop_front();
+
+ VERIFY( !lexicographical_compare(d1.begin(), d1.begin() + 10,
+ d2.begin(), d2.begin() + 10) );
+ VERIFY( !lexicographical_compare(d1.begin() + 10, d1.end() - 10,
+ d2.begin(), d2.end() - 10) );
+
+ const deque<unsigned char>& cd1 = d1;
+ const deque<unsigned char>& cd2 = d2;
+
+ VERIFY( !lexicographical_compare(cd1.begin(), cd1.begin() + 10,
+ cd2.begin() + 20, cd2.begin() + 30) );
+ VERIFY( !lexicographical_compare(cd1.begin() + 10, cd1.end() - 10,
+ d2.begin(), d2.end() - 10) );
+ VERIFY( lexicographical_compare(cd2.begin() + 10, cd2.end() - 10,
+ cd1.begin(), cd1.end() - 20) );
+}
+
+void test10()
+{
+ using namespace std;
+
+ deque<unsigned char> d;
+ for (int i = 0; i != 1024; ++i)
+ d.push_back(i);
+
+ vector<unsigned char> v(d.begin(), d.end());
+
+ VERIFY( lexicographical_compare(d.begin() + 5, d.end() - 1, v.begin() + 5, v.end()) );
+ VERIFY( !lexicographical_compare(v.begin(), v.end(), d.begin(), d.end()) );
+
+ const deque<unsigned char>& cd = d;
+
+ VERIFY( !lexicographical_compare(cd.begin(), cd.end(), v.begin(), v.end()) );
+ VERIFY( !lexicographical_compare(v.begin(), v.end(), cd.begin(), cd.end()) );
+}
+
+void test11()
+{
+ using namespace std;
+
+ int a[] = { 0, 1, 2, 3, 4 };
+ deque<unsigned char, __gnu_cxx::new_allocator<unsigned char> > d1(a, a + 5);
+ deque<unsigned char, __gnu_cxx::malloc_allocator<unsigned char> > d2(a, a + 5);
+
+ VERIFY( !lexicographical_compare(d1.begin(), d1.end(), d2.begin(), d2.end()) );
+}
+
+void
+test12()
+{
+ using namespace std;
+
+ deque<unsigned char> d;
+ int i = 0;
+ VERIFY( lexicographical_compare(d.begin(), d.end(), &i, &i + 1) );
+ VERIFY( !lexicographical_compare(&i, &i + 1, d.begin(), d.end()) );
+}
+
+int main()
+{
+ test01();
+ test02();
+ test03();
+ test04();
+ test05();
+ test06();
+ test07();
+ test08();
+ test09();
+ test10();
+ test11();
+ test12();
+}
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