1 /* Definitions of target machine for GNU compiler, for IBM S/390 2 Copyright (C) 1999, 2000, 2001, 2007, 2008 and 2009 3 Free Software Foundation, Inc. 4 Contributed by Hartmut Penner (hpenner@de.ibm.com) and 5 Ulrich Weigand (uweigand@de.ibm.com). 6 7 This file is part of GCC. 8 9 GCC is free software; you can redistribute it and/or modify it under 10 the terms of the GNU General Public License as published by the Free 11 Software Foundation; either version 3, or (at your option) any later 12 version. 13 14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 15 WARRANTY; without even the implied warranty of MERCHANTABILITY or 16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 17 for more details. 18 19 Under Section 7 of GPL version 3, you are granted additional 20 permissions described in the GCC Runtime Library Exception, version 21 3.1, as published by the Free Software Foundation. 22 23 You should have received a copy of the GNU General Public License and 24 a copy of the GCC Runtime Library Exception along with this program; 25 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 26 <http://www.gnu.org/licenses/>. */ 27 28 #define EXPD(fp) (((fp.l.upper) >> 20) & 0x7FF) 29 #define EXCESSD 1022 30 #define SIGNBIT 0x80000000 31 #define SIGND(fp) ((fp.l.upper) & SIGNBIT) 32 #define MANTD_LL(fp) ((fp.ll & (HIDDEND_LL-1)) | HIDDEND_LL) 33 #define FRACD_LL(fp) (fp.ll & (HIDDEND_LL-1)) 34 #define HIDDEND_LL ((UDItype_x)1 << 52) 35 36 typedef int DItype_x __attribute__ ((mode (DI))); 37 typedef unsigned int UDItype_x __attribute__ ((mode (DI))); 38 typedef int SItype_x __attribute__ ((mode (SI))); 39 typedef unsigned int USItype_x __attribute__ ((mode (SI))); 40 41 union double_long { 42 double d; 43 struct { 44 SItype_x upper; 45 USItype_x lower; 46 } l; 47 UDItype_x ll; 48 }; 49 50 DItype_x __fixdfdi (double a1); 51 52 /* convert double to int */ 53 DItype_x 54 __fixdfdi (double a1) 55 { 56 register union double_long dl1; 57 register int exp; 58 register DItype_x l; 59 60 dl1.d = a1; 61 62 /* +/- 0, denormalized */ 63 64 if (!EXPD (dl1)) 65 return 0; 66 67 exp = EXPD (dl1) - EXCESSD - 53; 68 69 /* number < 1 */ 70 71 if (exp < -53) 72 return 0; 73 74 /* NaN */ 75 76 if ((EXPD(dl1) == 0x7ff) && (FRACD_LL(dl1) != 0)) /* NaN */ 77 return 0x8000000000000000ULL; 78 79 /* Number big number & +/- inf */ 80 81 if (exp >= 11) { 82 l = (long long)1<<63; 83 if (!SIGND(dl1)) 84 l--; 85 return l; 86 } 87 88 l = MANTD_LL(dl1); 89 90 /* shift down until exp < 12 or l = 0 */ 91 if (exp > 0) 92 l <<= exp; 93 else 94 l >>= -exp; 95 96 return (SIGND (dl1) ? -l : l); 97 } 98