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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc1/] [libgcc/] [config/] [s390/] [32/] [_fixdfdi.c] - Rev 338
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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); }