63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/* Copyright (C) 1991, 1992, 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#ifndef __GNUC__
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#error This file uses GNU C extensions; you must compile with GCC.
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#else
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#include <ansidecl.h>
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#include <errno.h>
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#include <math.h>
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/* Deal with an infinite or NaN result.
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If ERROR is ERANGE, result is +Inf;
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if ERROR is - ERANGE, result is -Inf;
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otherwise result is NaN.
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This will set `errno' to either ERANGE or EDOM,
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and may return an infinity or NaN, or may do something else. */
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double
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DEFUN(__infnan, (error), int error)
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{
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switch (error)
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{
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case ERANGE:
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errno = ERANGE;
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break;
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case - ERANGE:
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errno = ERANGE;
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break;
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default:
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errno = EDOM;
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break;
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}
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/* Trigger a reserved operand fault. */
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{
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double result;
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asm volatile("emodd %1, %1, %2, %0, %0" : "=r" (result) :
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"i" (0), "i" (0x8000));
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return result;
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}
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}
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#endif
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weak_alias (__infnan, infnan)
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