mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-02 03:50:17 +00:00
99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
/* Copyright (C) 1989-2019 Free Software Foundation, Inc.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free
|
|
Software Foundation; either version 3, or (at your option) any later
|
|
version.
|
|
|
|
GCC 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 General Public License
|
|
for more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
/* This is a temporary specialization of code from libgcc/libgcc2.c. */
|
|
|
|
#include "soft-fp.h"
|
|
#include "quad-float128.h"
|
|
|
|
#define COPYSIGN(x,y) __builtin_copysignf128 (x, y)
|
|
#define INFINITY __builtin_inff128 ()
|
|
#define isnan __builtin_isnan
|
|
#define isinf __builtin_isinf
|
|
|
|
#if defined(FLOAT128_HW_INSNS) && !defined(__mulkc3)
|
|
#define __mulkc3 __mulkc3_sw
|
|
#endif
|
|
|
|
TCtype
|
|
__mulkc3 (TFtype a, TFtype b, TFtype c, TFtype d)
|
|
{
|
|
TFtype ac, bd, ad, bc, x, y;
|
|
TCtype res;
|
|
|
|
ac = a * c;
|
|
bd = b * d;
|
|
ad = a * d;
|
|
bc = b * c;
|
|
|
|
x = ac - bd;
|
|
y = ad + bc;
|
|
|
|
if (isnan (x) && isnan (y))
|
|
{
|
|
/* Recover infinities that computed as NaN + iNaN. */
|
|
_Bool recalc = 0;
|
|
if (isinf (a) || isinf (b))
|
|
{
|
|
/* z is infinite. "Box" the infinity and change NaNs in
|
|
the other factor to 0. */
|
|
a = COPYSIGN (isinf (a) ? 1 : 0, a);
|
|
b = COPYSIGN (isinf (b) ? 1 : 0, b);
|
|
if (isnan (c)) c = COPYSIGN (0, c);
|
|
if (isnan (d)) d = COPYSIGN (0, d);
|
|
recalc = 1;
|
|
}
|
|
if (isinf (c) || isinf (d))
|
|
{
|
|
/* w is infinite. "Box" the infinity and change NaNs in
|
|
the other factor to 0. */
|
|
c = COPYSIGN (isinf (c) ? 1 : 0, c);
|
|
d = COPYSIGN (isinf (d) ? 1 : 0, d);
|
|
if (isnan (a)) a = COPYSIGN (0, a);
|
|
if (isnan (b)) b = COPYSIGN (0, b);
|
|
recalc = 1;
|
|
}
|
|
if (!recalc
|
|
&& (isinf (ac) || isinf (bd)
|
|
|| isinf (ad) || isinf (bc)))
|
|
{
|
|
/* Recover infinities from overflow by changing NaNs to 0. */
|
|
if (isnan (a)) a = COPYSIGN (0, a);
|
|
if (isnan (b)) b = COPYSIGN (0, b);
|
|
if (isnan (c)) c = COPYSIGN (0, c);
|
|
if (isnan (d)) d = COPYSIGN (0, d);
|
|
recalc = 1;
|
|
}
|
|
if (recalc)
|
|
{
|
|
x = INFINITY * (a * c - b * d);
|
|
y = INFINITY * (a * d + b * c);
|
|
}
|
|
}
|
|
|
|
__real__ res = x;
|
|
__imag__ res = y;
|
|
return res;
|
|
}
|
|
|