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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc1/] [libgcc/] [config/] [s390/] [32/] [_fixunssfdi.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 EXP(fp) (((fp.l) >> 23) & 0xFF) #define EXCESS 126 #define SIGNBIT 0x80000000 #define SIGN(fp) ((fp.l) & SIGNBIT) #define HIDDEN (1 << 23) #define MANT(fp) (((fp.l) & 0x7FFFFF) | HIDDEN) #define FRAC(fp) ((fp.l) & 0x7FFFFF) 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 float_long { float f; USItype_x l; }; UDItype_x __fixunssfdi (float a1); /* convert float to unsigned int */ UDItype_x __fixunssfdi (float a1) { register union float_long fl1; register int exp; register UDItype_x l; fl1.f = a1; /* +/- 0, denormalized, negative */ if (!EXP (fl1) || SIGN(fl1)) return 0; exp = EXP (fl1) - EXCESS - 24; /* number < 1 */ if (exp < -24) return 0; /* NaN */ if ((EXP(fl1) == 0xff) && (FRAC(fl1) != 0)) /* NaN */ return 0x0ULL; /* Number big number & + inf */ if (exp >= 41) { return 0xFFFFFFFFFFFFFFFFULL; } l = MANT(fl1); if (exp > 0) l <<= exp; else l >>= -exp; return l; }