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re PR libstdc++/56085 (Unsafe negation in C++03 pow(complex,int))

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2013-01-24  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/56085
	* include/std/complex (pow(const complex<>&, int)): Avoid __n
	signed overflow.

From-SVN: r195421
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Paolo Carlini 2013-01-24 12:20:57 +00:00 committed by Paolo Carlini
parent e86c0101ae
commit 91f4a9e332
2 changed files with 8 additions and 4 deletions
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6
libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
2013-01-24 Paolo Carlini <paolo.carlini@oracle.com>
PR libstdc++/56085
* include/std/complex (pow(const complex<>&, int)): Avoid __n
signed overflow.
2013-01-22 Jakub Jelinek <jakub@redhat.com> 2013-01-22 Jakub Jelinek <jakub@redhat.com>
* testsuite/29_atomics/atomic_flag/test_and_set/explicit-hle.cc: * testsuite/29_atomics/atomic_flag/test_and_set/explicit-hle.cc:

6
libstdc++-v3/include/std/complex
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@ -1,8 +1,6 @@
// The template and inlines for the -*- C++ -*- complex number classes. // The template and inlines for the -*- C++ -*- complex number classes.
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, // Copyright (C) 1997-2013 Free Software Foundation, Inc.
// 2006, 2007, 2008, 2009, 2010, 2011
// Free Software Foundation, Inc.
// //
// This file is part of the GNU ISO C++ Library. This library is free // 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 // software; you can redistribute it and/or modify it under the
@ -978,7 +976,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
pow(const complex<_Tp>& __z, int __n) pow(const complex<_Tp>& __z, int __n)
{ {
return __n < 0 return __n < 0
? complex<_Tp>(1) / std::__complex_pow_unsigned(__z, -__n) ? complex<_Tp>(1) / std::__complex_pow_unsigned(__z, -(unsigned)__n)
: std::__complex_pow_unsigned(__z, __n); : std::__complex_pow_unsigned(__z, __n);
} }
#endif #endif