re PR target/54686 (std::abs (long long) resorts to std::abs (double) if llabs is absent)

2012-10-05  Marc Glisse  <marc.glisse@inria.fr>

	PR libstdc++/54686
	* include/c_std/cstdlib (abs(long long)): Define with
	__builtin_llabs when we have long long.
	(abs(long)): Use __builtin_labs.
	(abs(__int128)): Define when we have __int128.
	* testsuite/26_numerics/headers/cstdlib/54686.c: New file.

From-SVN: r192132

libstdc++-v3/ChangeLog

+2012-10-05  Marc Glisse  <marc.glisse@inria.fr>
+
+	PR libstdc++/54686
+	* include/c_std/cstdlib (abs(long long)): Define with
+	__builtin_llabs when we have long long.
+	(abs(long)): Use __builtin_labs.
+	(abs(__int128)): Define when we have __int128.
+	* testsuite/26_numerics/headers/cstdlib/54686.c: New file.
+
 2012-10-03  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR libstdc++/53248

libstdc++-v3/include/c_std/cstdlib

@@ -135,7 +135,17 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #endif // _GLIBCXX_USE_WCHAR_T
 
   inline long
-  abs(long __i) { return labs(__i); }
+  abs(long __i) { return __builtin_labs(__i); }
+
+#ifdef _GLIBCXX_USE_LONG_LONG
+  inline long long
+  abs(long long __x) { return __builtin_llabs (__x); }
+#endif
+
+#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_INT128)
+  inline __int128
+  abs(__int128 __x) { return __x >= 0 ? __x : -__x; }
+#endif
 
   inline ldiv_t
   div(long __i, long __j) { return ldiv(__i, __j); }
@@ -168,9 +178,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   using ::_Exit;
 #endif
 
-  inline long long
-  abs(long long __x) { return __x >= 0 ? __x : -__x; }
-
 #if !_GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
   using ::llabs;
 
@@ -205,7 +212,6 @@ namespace std
   using ::__gnu_cxx::lldiv_t;
 #endif
   using ::__gnu_cxx::_Exit;
-  using ::__gnu_cxx::abs;
 #if !_GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
   using ::__gnu_cxx::llabs;
   using ::__gnu_cxx::div;

libstdc++-v3/testsuite/26_numerics/headers/cstdlib/54686.c

+// { dg-do compile }
+// { dg-options "-std=c++11" }
+
+// Copyright (C) 2012 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 <cmath>
+#include <cstdlib>
+#include <type_traits>
+#include <utility>
+
+#ifdef _GLIBCXX_USE_LONG_LONG
+void test01()
+{
+  static_assert (std::is_same<decltype (std::abs (std::declval<long long> ())),
+			      long long>::value, "Missing abs(long long)");
+}
+#endif