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limits (__glibcxx_digits10, [...]): Use 643L instead of 643 to avoid overflows on 16-bit machines.

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2010-11-03  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/limits (__glibcxx_digits10, __glibcxx_max_digits10):
	Use 643L instead of 643 to avoid overflows on 16-bit machines.
	* include/ext/numeric_traits.h (__glibcxx_max_digits10): Likewise.

From-SVN: r166261
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Paolo Carlini 2010-11-03 17:33:54 +00:00 committed by Paolo Carlini
parent fdb8b4c025
commit dd60dacdc5
3 changed files with 10 additions and 4 deletions
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6
libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
2010-11-03 Paolo Carlini <paolo.carlini@oracle.com>
* include/std/limits (__glibcxx_digits10, __glibcxx_max_digits10):
Use 643L instead of 643 to avoid overflows on 16-bit machines.
* include/ext/numeric_traits.h (__glibcxx_max_digits10): Likewise.
2010-11-02 Benjamin Kosnik <bkoz@redhat.com>
* include/std/chrono: Use typedefs.

4
libstdc++-v3/include/ext/numeric_traits.h
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@ -1,6 +1,6 @@
// -*- C++ -*-
// Copyright (C) 2007, 2009 Free Software Foundation, Inc.
// Copyright (C) 2007, 2008, 2009, 2010 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
@ -85,7 +85,7 @@ _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
#define __glibcxx_max_digits10(_Tp) \
(2 + __glibcxx_floating(_Tp, __FLT_MANT_DIG__, __DBL_MANT_DIG__, \
__LDBL_MANT_DIG__) * 3010 / 10000)
__LDBL_MANT_DIG__) * 643L / 2136)
#define __glibcxx_digits10(_Tp) \
__glibcxx_floating(_Tp, __FLT_DIG__, __DBL_DIG__, __LDBL_DIG__)

4
libstdc++-v3/include/std/limits
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@ -140,10 +140,10 @@
// The fraction 643/2136 approximates log10(2) to 7 significant digits.
#define __glibcxx_digits10(T) \
(__glibcxx_digits (T) * 643 / 2136)
(__glibcxx_digits (T) * 643L / 2136)
#define __glibcxx_max_digits10(T) \
(2 + (T) * 643 / 2136)
(2 + (T) * 643L / 2136)
_GLIBCXX_BEGIN_NAMESPACE(std)