Retro68/gcc/libgcc/config/rs6000/ppc64-fp.c
2017-10-07 02:16:47 +02:00

238 lines
6.3 KiB
C

/* Functions needed for soft-float on powerpc64-linux, copied from
libgcc2.c with macros expanded to force the use of specific types.
Copyright (C) 1989-2017 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/>. */
#if defined(__powerpc64__) || defined (__64BIT__) || defined(__ppc64__)
#define TMODES
#include "fp-bit.h"
extern DItype __fixtfdi (TFtype);
extern DItype __fixdfdi (DFtype);
extern DItype __fixsfdi (SFtype);
extern USItype __fixunsdfsi (DFtype);
extern USItype __fixunssfsi (SFtype);
extern TFtype __floatditf (DItype);
extern TFtype __floatunditf (UDItype);
extern DFtype __floatdidf (DItype);
extern DFtype __floatundidf (UDItype);
extern SFtype __floatdisf (DItype);
extern SFtype __floatundisf (UDItype);
extern DItype __fixunstfdi (TFtype);
static DItype local_fixunssfdi (SFtype);
static DItype local_fixunsdfdi (DFtype);
DItype
__fixtfdi (TFtype a)
{
if (a < 0)
return - __fixunstfdi (-a);
return __fixunstfdi (a);
}
DItype
__fixdfdi (DFtype a)
{
if (a < 0)
return - local_fixunsdfdi (-a);
return local_fixunsdfdi (a);
}
DItype
__fixsfdi (SFtype a)
{
if (a < 0)
return - local_fixunssfdi (-a);
return local_fixunssfdi (a);
}
USItype
__fixunsdfsi (DFtype a)
{
if (a >= - (DFtype) (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
return (SItype) (a + (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
- (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1);
return (SItype) a;
}
USItype
__fixunssfsi (SFtype a)
{
if (a >= - (SFtype) (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
return (SItype) (a + (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
- (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1);
return (SItype) a;
}
TFtype
__floatditf (DItype u)
{
DFtype dh, dl;
dh = (SItype) (u >> (sizeof (SItype) * 8));
dh *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
dl = (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
return (TFtype) dh + (TFtype) dl;
}
TFtype
__floatunditf (UDItype u)
{
DFtype dh, dl;
dh = (USItype) (u >> (sizeof (SItype) * 8));
dh *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
dl = (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
return (TFtype) dh + (TFtype) dl;
}
DFtype
__floatdidf (DItype u)
{
DFtype d;
d = (SItype) (u >> (sizeof (SItype) * 8));
d *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
d += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
return d;
}
DFtype
__floatundidf (UDItype u)
{
DFtype d;
d = (USItype) (u >> (sizeof (SItype) * 8));
d *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
d += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
return d;
}
SFtype
__floatdisf (DItype u)
{
DFtype f;
if (53 < (sizeof (DItype) * 8)
&& 53 > ((sizeof (DItype) * 8) - 53 + 24))
{
if (! (- ((DItype) 1 << 53) < u
&& u < ((DItype) 1 << 53)))
{
if ((UDItype) u & (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1))
{
u &= ~ (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1);
u |= ((UDItype) 1 << ((sizeof (DItype) * 8) - 53));
}
}
}
f = (SItype) (u >> (sizeof (SItype) * 8));
f *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
f += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
return (SFtype) f;
}
SFtype
__floatundisf (UDItype u)
{
DFtype f;
if (53 < (sizeof (DItype) * 8)
&& 53 > ((sizeof (DItype) * 8) - 53 + 24))
{
if (u >= ((UDItype) 1 << 53))
{
if ((UDItype) u & (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1))
{
u &= ~ (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1);
u |= ((UDItype) 1 << ((sizeof (DItype) * 8) - 53));
}
}
}
f = (USItype) (u >> (sizeof (SItype) * 8));
f *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
f += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
return (SFtype) f;
}
DItype
__fixunstfdi (TFtype a)
{
if (a < 0)
return 0;
/* Compute high word of result, as a flonum. */
const TFtype b = (a / (((UDItype) 1) << (sizeof (SItype) * 8)));
/* Convert that to fixed (but not to DItype!),
and shift it into the high word. */
UDItype v = (USItype) b;
v <<= (sizeof (SItype) * 8);
/* Remove high part from the TFtype, leaving the low part as flonum. */
a -= (TFtype) v;
/* Convert that to fixed (but not to DItype!) and add it in.
Sometimes A comes out negative. This is significant, since
A has more bits than a long int does. */
if (a < 0)
v -= (USItype) (-a);
else
v += (USItype) a;
return v;
}
/* This version is needed to prevent recursion; fixunsdfdi in libgcc
calls fixdfdi, which in turn calls calls fixunsdfdi. */
static DItype
local_fixunsdfdi (DFtype a)
{
USItype hi, lo;
hi = a / (((UDItype) 1) << (sizeof (SItype) * 8));
lo = (a - ((DFtype) hi) * (((UDItype) 1) << (sizeof (SItype) * 8)));
return ((UDItype) hi << (sizeof (SItype) * 8)) | lo;
}
/* This version is needed to prevent recursion; fixunssfdi in libgcc
calls fixsfdi, which in turn calls calls fixunssfdi. */
static DItype
local_fixunssfdi (SFtype original_a)
{
DFtype a = original_a;
USItype hi, lo;
hi = a / (((UDItype) 1) << (sizeof (SItype) * 8));
lo = (a - ((DFtype) hi) * (((UDItype) 1) << (sizeof (SItype) * 8)));
return ((UDItype) hi << (sizeof (SItype) * 8)) | lo;
}
#endif /* __powerpc64__ */