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/* Definitions of target machine for GNU compiler, for IBM S/390
Copyright (C) 1999, 2000, 2001, 2007, 2008 and 2009
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/>. */
#define EXPD(fp) (((fp.l.upper) >> 20) & 0x7FF)
#define EXCESSD 1022
#define SIGNBIT 0x80000000
#define SIGND(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;
};
DItype_x __fixdfdi (double a1);
/* convert double to int */
DItype_x
__fixdfdi (double a1)
{
register union double_long dl1;
register int exp;
register DItype_x l;
dl1.d = a1;
/* +/- 0, denormalized */
if (!EXPD (dl1))
return 0;
exp = EXPD (dl1) - EXCESSD - 53;
/* number < 1 */
if (exp < -53)
return 0;
/* NaN */
if ((EXPD(dl1) == 0x7ff) && (FRACD_LL(dl1) != 0)) /* NaN */
return 0x8000000000000000ULL;
/* Number big number & +/- inf */
if (exp >= 11) {
l = (long long)1<<63;
if (!SIGND(dl1))
l--;
return l;
}
l = MANTD_LL(dl1);
/* shift down until exp < 12 or l = 0 */
if (exp > 0)
l <<= exp;
else
l >>= -exp;
return (SIGND (dl1) ? -l : l);
}
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