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51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
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/* Copyright (C) 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <math.h>
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double
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__rint (double x)
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{
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if (isless (fabs (x), 9007199254740992.0)) /* 1 << DBL_MANT_DIG */
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{
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double tmp1, new_x;
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__asm (
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#ifdef _IEEE_FP_INEXACT
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"cvttq/svid %2,%1\n\t"
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#else
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"cvttq/svd %2,%1\n\t"
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#endif
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"cvtqt/d %1,%0\n\t"
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: "=f"(new_x), "=&f"(tmp1)
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: "f"(x));
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/* rint(-0.1) == -0, and in general we'll always have the same
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sign as our input. */
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x = copysign(new_x, x);
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}
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return x;
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}
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weak_alias (__rint, rint)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__rint, __rintl)
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weak_alias (__rint, rintl)
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#endif
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