mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-15 04:20:28 +08:00
d2784f806c
values. * sysdeps/m68k/fpu/e_scalb.c: Likewise. 2001-04-10 Andreas Schwab <schwab@suse.de> * sysdeps/m68k/fpu/e_pow.c: Correct handling of some exceptional values. * sysdeps/m68k/fpu/e_scalb.c: Likewise.
61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/* Copyright (C) 1997, 1999 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. */
|
|
|
|
#include <math.h>
|
|
#include "math_private.h"
|
|
#include "mathimpl.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)
|
|
#define m81(func) __m81_u(s(func))
|
|
|
|
float_type
|
|
s(__ieee754_scalb) (float_type x, float_type fn)
|
|
{
|
|
float_type retval;
|
|
unsigned long x_cond = __m81_test (x);
|
|
unsigned long fn_cond = __m81_test (fn);
|
|
|
|
if ((x_cond | fn_cond) & __M81_COND_NAN)
|
|
return x * fn;
|
|
|
|
if (fn_cond & __M81_COND_INF)
|
|
{
|
|
if (!(fn_cond & __M81_COND_NEG))
|
|
return x * fn;
|
|
else if (x_cond & __M81_COND_ZERO)
|
|
return x;
|
|
else
|
|
return x / -fn;
|
|
}
|
|
|
|
if (m81(__rint) (fn) != fn)
|
|
return (x - x) / (x - x);
|
|
|
|
__asm ("fscale%.x %1, %0" : "=f" (retval) : "f" (fn), "0" (x));
|
|
return retval;
|
|
}
|