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re PR libstdc++/51133 (Incorrect implementation of std::tr1::hermite()) 

2011-11-15  Jason Dick  <dickphd@gmail.com>

	PR libstdc++/51133
	* include/tr1/poly_hermite.tcc (__poly_hermite_recursion): Fix
	wrong sign in recursion relation.

From-SVN: r181381
This commit is contained in:
Jason Dick 2011-11-15 10:49:00 +00:00 committed by Paolo Carlini
parent 0ea069123c
commit 402356d146
2 changed files with 8 additions and 2 deletions
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6
libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
2011-11-15 Jason Dick <dickphd@gmail.com>
PR libstdc++/51133
* include/tr1/poly_hermite.tcc (__poly_hermite_recursion): Fix
wrong sign in recursion relation.
2011-11-14 Paolo Carlini <paolo.carlini@oracle.com> 2011-11-14 Paolo Carlini <paolo.carlini@oracle.com>
* include/c_global/cmath (frexp, modf, remquo): Do not mark constexpr, * include/c_global/cmath (frexp, modf, remquo): Do not mark constexpr,

4
libstdc++-v3/include/tr1/poly_hermite.tcc
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@ -1,6 +1,6 @@
// Special functions -*- C++ -*- // Special functions -*- C++ -*-
// Copyright (C) 2006, 2007, 2008, 2009, 2010 // Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011
// Free Software Foundation, Inc. // 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
@ -84,7 +84,7 @@ namespace tr1
unsigned int __i; unsigned int __i;
for (__H_nm2 = __H_0, __H_nm1 = __H_1, __i = 2; __i <= __n; ++__i) for (__H_nm2 = __H_0, __H_nm1 = __H_1, __i = 2; __i <= __n; ++__i)
{ {
__H_n = 2 * (__x * __H_nm1 + (__i - 1) * __H_nm2); __H_n = 2 * (__x * __H_nm1 - (__i - 1) * __H_nm2);
__H_nm2 = __H_nm1; __H_nm2 = __H_nm1;
__H_nm1 = __H_n; __H_nm1 = __H_n;
} }