Viewing file:  _fixunsdfdi.c (3.1 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* Definitions of target machine for GNU compiler, for IBM S/390
Copyright (C) 1999-2022 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.upper) >> 20) & 0x7FF)
#define EXPONENT_BIAS 1023
#define MANTISSA_BITS 52
#define PRECISION (MANTISSA_BITS + 1)
#define SIGNBIT 0x80000000
#define SIGN(fp) ((fp.l.upper) & SIGNBIT)
#define MANTD_LL(fp) ((fp.ll & (HIDDEND_LL-1)) | HIDDEND_LL)
#define FRACD_LL(fp) (fp.ll & (HIDDEND_LL-1))
#define HIDDEND_LL ((UDItype_x)1 << 52)
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 {
double d;
struct {
SItype_x upper;
USItype_x lower;
} l;
UDItype_x ll;
};
static __inline__ void
fexceptdiv (float d, float e)
{
__asm__ __volatile__ ("debr %0,%1" : : "f" (d), "f" (e) );
}
UDItype_x __fixunsdfdi (double a1);
/* convert double to unsigned int */
UDItype_x
__fixunsdfdi (double a1)
{
register union double_long dl1;
register int exp;
register UDItype_x l;
dl1.d = a1;
/* +/- 0, denormalized */
if (!EXPD (dl1))
return 0;
/* Negative. */
if (SIGN (dl1))
{
/* Value is <= -1.0
C99 Annex F.4 requires an "invalid" exception to be thrown. */
if (EXPD (dl1) >= EXPONENT_BIAS)
fexceptdiv (0.0, 0.0);
return 0;
}
exp = EXPD (dl1) - EXPONENT_BIAS - MANTISSA_BITS;
/* number < 1 */
if (exp < -PRECISION)
return 0;
/* NaN */
if ((EXPD(dl1) == 0x7ff) && (FRACD_LL(dl1) != 0)) /* NaN */
{
/* C99 Annex F.4 requires an "invalid" exception to be thrown. */
fexceptdiv (0.0, 0.0);
return 0x0ULL;
}
/* Number big number & + inf */
if (exp >= 12)
{
/* C99 Annex F.4 requires an "invalid" exception to be thrown. */
fexceptdiv (0.0, 0.0);
return 0xFFFFFFFFFFFFFFFFULL;
}
l = MANTD_LL(dl1);
/* shift down until exp < 12 or l = 0 */
if (exp > 0)
l <<= exp;
else
l >>= -exp;
return l;
}
#endif /* !__s390x__ */
|
