98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/* Definitions of target machine for GNU compiler, for IBM S/390
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Copyright (C) 1999, 2000, 2001, 2007, 2008 and 2009
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Free Software Foundation, Inc.
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Contributed by Hartmut Penner (hpenner@de.ibm.com) and
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Ulrich Weigand (uweigand@de.ibm.com).
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#define EXPD(fp) (((fp.l.upper) >> 20) & 0x7FF)
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#define EXCESSD 1022
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#define SIGNBIT 0x80000000
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#define SIGND(fp) ((fp.l.upper) & SIGNBIT)
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#define MANTD_LL(fp) ((fp.ll & (HIDDEND_LL-1)) | HIDDEND_LL)
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#define FRACD_LL(fp) (fp.ll & (HIDDEND_LL-1))
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#define HIDDEND_LL ((UDItype_x)1 << 52)
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typedef int DItype_x __attribute__ ((mode (DI)));
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typedef unsigned int UDItype_x __attribute__ ((mode (DI)));
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typedef int SItype_x __attribute__ ((mode (SI)));
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typedef unsigned int USItype_x __attribute__ ((mode (SI)));
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union double_long {
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double d;
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struct {
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SItype_x upper;
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USItype_x lower;
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} l;
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UDItype_x ll;
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};
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DItype_x __fixdfdi (double a1);
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/* convert double to int */
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DItype_x
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__fixdfdi (double a1)
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{
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register union double_long dl1;
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register int exp;
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register DItype_x l;
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dl1.d = a1;
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/* +/- 0, denormalized */
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if (!EXPD (dl1))
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return 0;
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exp = EXPD (dl1) - EXCESSD - 53;
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/* number < 1 */
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if (exp < -53)
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return 0;
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/* NaN */
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if ((EXPD(dl1) == 0x7ff) && (FRACD_LL(dl1) != 0)) /* NaN */
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return 0x8000000000000000ULL;
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/* Number big number & +/- inf */
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if (exp >= 11) {
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l = (long long)1<<63;
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if (!SIGND(dl1))
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l--;
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return l;
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}
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l = MANTD_LL(dl1);
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/* shift down until exp < 12 or l = 0 */
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if (exp > 0)
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l <<= exp;
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else
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l >>= -exp;
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return (SIGND (dl1) ? -l : l);
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}
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