93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/* Definitions of target machine for GNU compiler, for IBM S/390
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Copyright (C) 1999-2013 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 EXP(fp) (((fp.l) >> 23) & 0xFF)
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#define EXCESS 126
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#define SIGNBIT 0x80000000
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#define SIGN(fp) ((fp.l) & SIGNBIT)
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#define HIDDEN (1 << 23)
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#define MANT(fp) (((fp.l) & 0x7FFFFF) | HIDDEN)
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#define FRAC(fp) ((fp.l) & 0x7FFFFF)
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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 float_long
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{
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float f;
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USItype_x l;
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};
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DItype_x __fixsfdi (float a1);
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/* convert double to int */
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DItype_x
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__fixsfdi (float a1)
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{
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register union float_long fl1;
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register int exp;
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register DItype_x l;
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fl1.f = a1;
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/* +/- 0, denormalized */
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if (!EXP (fl1))
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return 0;
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exp = EXP (fl1) - EXCESS - 24;
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/* number < 1 */
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if (exp < -24)
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return 0;
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/* NaN */
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if ((EXP(fl1) == 0xff) && (FRAC(fl1) != 0)) /* NaN */
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return 0x8000000000000000ULL;
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/* Number big number & +/- inf */
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if (exp >= 40) {
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l = (long long)1<<63;
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if (!SIGN(fl1))
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l--;
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return l;
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}
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l = MANT(fl1);
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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 (SIGN (fl1) ? -l : l);
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}
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