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remquo implementation for double according to IEEE.

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This commit is contained in:
Ulrich Drepper 1997-04-17 15:04:04 +00:00
parent d80b3f3c5b
commit 843682819d
1 changed files with 58 additions and 0 deletions
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58
sysdeps/m68k/fpu/s_remquo.c Normal file
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/* Compute remainder and a congruent to the quotient. m68k fpu version
Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#define __LIBC_M81_MATH_INLINES
#include <math.h>
#ifndef SUFF
#define SUFF
#endif
#ifndef float_type
#define float_type double
#endif
#define CONCATX(a,b) __CONCAT(a,b)
#define s(name) CONCATX(name,SUFF)
float_type
s(__remquo) (float_type x, float_type y, int *quo)
{
float_type result;
int cquo, fpsr;
/* FIXME: Which of frem and fmod is correct? */
#if 1
__asm ("frem%.x %2,%0\n\tfmove%.l %/fpsr,%1"
: "=f" (result), "=dm" (fpsr) : "f" (y), "0" (x));
cquo = (fpsr >> 16) & 0x7f;
if ((result > 0) != (x > 0))
cquo--;
#else
__asm ("fmod%.x %2,%0\n\tfmove%.l %/fpsr,%1"
: "=f" (result), "=dm" (fpsr) : "f" (y), "0" (x));
cquo = (fpsr >> 16) & 0x7f;
#endif
if (fpsr & (1 << 23))
cquo = -cquo;
*quo = cquo;
return result;
}
#define weak_aliasx(a,b) weak_alias(a,b)
weak_aliasx (s(__remquo), s(remquo))