1 /* Definitions of target machine for GNU compiler, for IBM S/390 2 Copyright (C) 1999-2019 Free Software Foundation, Inc. 3 Contributed by Hartmut Penner (hpenner@de.ibm.com) and 4 Ulrich Weigand (uweigand@de.ibm.com). 5 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free 10 Software Foundation; either version 3, or (at your option) any later 11 version. 12 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16 for more details. 17 18 Under Section 7 of GPL version 3, you are granted additional 19 permissions described in the GCC Runtime Library Exception, version 20 3.1, as published by the Free Software Foundation. 21 22 You should have received a copy of the GNU General Public License and 23 a copy of the GCC Runtime Library Exception along with this program; 24 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 25 <http://www.gnu.org/licenses/>. */ 26 27 #ifndef __s390x__ 28 29 #define EXPD(fp) (((fp.l.upper) >> 20) & 0x7FF) 30 #define EXPONENT_BIAS 1023 31 #define MANTISSA_BITS 52 32 #define PRECISION (MANTISSA_BITS + 1) 33 #define SIGNBIT 0x80000000 34 #define SIGN(fp) ((fp.l.upper) & SIGNBIT) 35 #define MANTD_LL(fp) ((fp.ll & (HIDDEND_LL-1)) | HIDDEND_LL) 36 #define FRACD_LL(fp) (fp.ll & (HIDDEND_LL-1)) 37 #define HIDDEND_LL ((UDItype_x)1 << 52) 38 39 typedef int DItype_x __attribute__ ((mode (DI))); 40 typedef unsigned int UDItype_x __attribute__ ((mode (DI))); 41 typedef int SItype_x __attribute__ ((mode (SI))); 42 typedef unsigned int USItype_x __attribute__ ((mode (SI))); 43 44 union double_long { 45 double d; 46 struct { 47 SItype_x upper; 48 USItype_x lower; 49 } l; 50 UDItype_x ll; 51 }; 52 53 static __inline__ void 54 fexceptdiv (float d, float e) 55 { 56 __asm__ __volatile__ ("debr %0,%1" : : "f" (d), "f" (e) ); 57 } 58 59 UDItype_x __fixunsdfdi (double a1); 60 61 /* convert double to unsigned int */ 62 UDItype_x 63 __fixunsdfdi (double a1) 64 { 65 register union double_long dl1; 66 register int exp; 67 register UDItype_x l; 68 69 dl1.d = a1; 70 71 /* +/- 0, denormalized */ 72 if (!EXPD (dl1)) 73 return 0; 74 75 /* Negative. */ 76 if (SIGN (dl1)) 77 { 78 /* Value is <= -1.0 79 C99 Annex F.4 requires an "invalid" exception to be thrown. */ 80 if (EXPD (dl1) >= EXPONENT_BIAS) 81 fexceptdiv (0.0, 0.0); 82 return 0; 83 } 84 85 exp = EXPD (dl1) - EXPONENT_BIAS - MANTISSA_BITS; 86 87 /* number < 1 */ 88 89 if (exp < -PRECISION) 90 return 0; 91 92 /* NaN */ 93 94 if ((EXPD(dl1) == 0x7ff) && (FRACD_LL(dl1) != 0)) /* NaN */ 95 { 96 /* C99 Annex F.4 requires an "invalid" exception to be thrown. */ 97 fexceptdiv (0.0, 0.0); 98 return 0x0ULL; 99 } 100 101 /* Number big number & + inf */ 102 103 if (exp >= 12) 104 { 105 /* C99 Annex F.4 requires an "invalid" exception to be thrown. */ 106 fexceptdiv (0.0, 0.0); 107 return 0xFFFFFFFFFFFFFFFFULL; 108 } 109 110 l = MANTD_LL(dl1); 111 112 /* shift down until exp < 12 or l = 0 */ 113 if (exp > 0) 114 l <<= exp; 115 else 116 l >>= -exp; 117 118 return l; 119 } 120 #endif /* !__s390x__ */ 121