mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-04 16:50:57 +00:00
123 lines
4.1 KiB
C
123 lines
4.1 KiB
C
/* Definitions of target machine for GNU compiler, for IBM S/390
|
|
Copyright (C) 1999-2017 Free Software Foundation, Inc.
|
|
Contributed by Hartmut Penner (hpenner@de.ibm.com) and
|
|
Ulrich Weigand (uweigand@de.ibm.com).
|
|
|
|
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/>. */
|
|
|
|
#ifndef __s390x__
|
|
|
|
#define EXPD(fp) (((fp.l.i[0]) >> 16) & 0x7FFF)
|
|
#define EXPONENT_BIAS 16383
|
|
#define MANTISSA_BITS 112
|
|
#define PRECISION (MANTISSA_BITS + 1)
|
|
#define SIGNBIT 0x80000000
|
|
#define SIGN(fp) ((fp.l.i[0]) & SIGNBIT)
|
|
#define MANTD_HIGH_LL(fp) ((fp.ll[0] & HIGH_LL_FRAC_MASK) | HIGH_LL_UNIT_BIT)
|
|
#define MANTD_LOW_LL(fp) (fp.ll[1])
|
|
#define FRACD_ZERO_P(fp) (!fp.ll[1] && !(fp.ll[0] & HIGH_LL_FRAC_MASK))
|
|
#define HIGH_LL_FRAC_BITS 48
|
|
#define HIGH_LL_UNIT_BIT ((UDItype_x)1 << HIGH_LL_FRAC_BITS)
|
|
#define HIGH_LL_FRAC_MASK (HIGH_LL_UNIT_BIT - 1)
|
|
#define LLONG_MAX 9223372036854775807LL
|
|
#define LLONG_MIN (-LLONG_MAX - 1LL)
|
|
|
|
typedef int DItype_x __attribute__ ((mode (DI)));
|
|
typedef unsigned int UDItype_x __attribute__ ((mode (DI)));
|
|
typedef int SItype_x __attribute__ ((mode (SI)));
|
|
typedef unsigned int USItype_x __attribute__ ((mode (SI)));
|
|
|
|
union double_long {
|
|
long double d;
|
|
struct {
|
|
SItype_x i[4]; /* 32 bit parts: 0 upper ... 3 lowest */
|
|
} l;
|
|
UDItype_x ll[2]; /* 64 bit parts: 0 upper, 1 lower */
|
|
};
|
|
|
|
static __inline__ void
|
|
fexceptdiv (float d, float e)
|
|
{
|
|
__asm__ __volatile__ ("debr %0,%1" : : "f" (d), "f" (e) );
|
|
}
|
|
|
|
DItype_x __fixtfdi (long double a1);
|
|
|
|
/* convert double to unsigned int */
|
|
DItype_x
|
|
__fixtfdi (long double a1)
|
|
{
|
|
register union double_long dl1;
|
|
register int exp;
|
|
register UDItype_x l;
|
|
|
|
dl1.d = a1;
|
|
|
|
/* +/- 0, denormalized */
|
|
if (!EXPD (dl1))
|
|
return 0;
|
|
|
|
/* The exponent - considered the binary point at the right end of
|
|
the mantissa. */
|
|
exp = EXPD (dl1) - EXPONENT_BIAS - MANTISSA_BITS;
|
|
|
|
/* number < 1: If the mantissa would need to be right-shifted more bits than
|
|
its size the result would be zero. */
|
|
if (exp <= -PRECISION)
|
|
return 0;
|
|
|
|
/* NaN: All exponent bits set and a nonzero fraction. */
|
|
if ((EXPD(dl1) == 0x7fff) && !FRACD_ZERO_P (dl1))
|
|
{
|
|
/* C99 Annex F.4 requires an "invalid" exception to be thrown. */
|
|
fexceptdiv (0.0, 0.0);
|
|
return 0x8000000000000000ULL;
|
|
}
|
|
|
|
/* One extra bit is needed for the unit bit which is appended by
|
|
MANTD_HIGH_LL on the left of the matissa. */
|
|
exp += HIGH_LL_FRAC_BITS + 1;
|
|
|
|
/* If the result would still need a left shift it will be too large
|
|
to be represented. Compared to the unsigned variant we have to
|
|
take care that there is still space for the sign bit to be
|
|
applied. So we can only go on if there is a right-shift by one
|
|
or more. */
|
|
if (exp >= 0)
|
|
{
|
|
/* Don't throw an exception for -1p+63 */
|
|
if (!SIGN (dl1)
|
|
|| exp > 0
|
|
|| MANTD_LOW_LL (dl1) >> (HIGH_LL_FRAC_BITS + 1)
|
|
|| (dl1.ll[0] & HIGH_LL_FRAC_MASK))
|
|
/* C99 Annex F.4 requires an "invalid" exception to be thrown. */
|
|
fexceptdiv (0.0, 0.0);
|
|
return SIGN (dl1) ? LLONG_MIN : LLONG_MAX;
|
|
}
|
|
|
|
l = MANTD_LOW_LL (dl1) >> (HIGH_LL_FRAC_BITS + 1)
|
|
| MANTD_HIGH_LL (dl1) << (64 - (HIGH_LL_FRAC_BITS + 1));
|
|
|
|
return SIGN (dl1) ? -(l >> -exp) : l >> -exp;
|
|
}
|
|
#endif /* !__s390x__ */
|