Mercurial > hg > CbC > CbC_gcc
annotate libgcc/config/s390/32/_fixunsdfdi.c @ 158:494b0b89df80 default tip
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 25 May 2020 18:13:55 +0900 |
parents | 1830386684a0 |
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1 /* Definitions of target machine for GNU compiler, for IBM S/390 |
145 | 2 Copyright (C) 1999-2020 Free Software Foundation, Inc. |
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3 Contributed by Hartmut Penner (hpenner@de.ibm.com) and |
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4 Ulrich Weigand (uweigand@de.ibm.com). |
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5 |
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6 This file is part of GCC. |
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7 |
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8 GCC is free software; you can redistribute it and/or modify it under |
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9 the terms of the GNU General Public License as published by the Free |
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10 Software Foundation; either version 3, or (at your option) any later |
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11 version. |
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12 |
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13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
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14 WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 Under Section 7 of GPL version 3, you are granted additional |
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19 permissions described in the GCC Runtime Library Exception, version |
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20 3.1, as published by the Free Software Foundation. |
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21 |
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22 You should have received a copy of the GNU General Public License and |
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23 a copy of the GCC Runtime Library Exception along with this program; |
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24 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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25 <http://www.gnu.org/licenses/>. */ |
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26 |
111 | 27 #ifndef __s390x__ |
28 | |
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29 #define EXPD(fp) (((fp.l.upper) >> 20) & 0x7FF) |
111 | 30 #define EXPONENT_BIAS 1023 |
31 #define MANTISSA_BITS 52 | |
32 #define PRECISION (MANTISSA_BITS + 1) | |
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33 #define SIGNBIT 0x80000000 |
111 | 34 #define SIGN(fp) ((fp.l.upper) & SIGNBIT) |
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35 #define MANTD_LL(fp) ((fp.ll & (HIDDEND_LL-1)) | HIDDEND_LL) |
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36 #define FRACD_LL(fp) (fp.ll & (HIDDEND_LL-1)) |
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37 #define HIDDEND_LL ((UDItype_x)1 << 52) |
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38 |
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39 typedef int DItype_x __attribute__ ((mode (DI))); |
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40 typedef unsigned int UDItype_x __attribute__ ((mode (DI))); |
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41 typedef int SItype_x __attribute__ ((mode (SI))); |
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42 typedef unsigned int USItype_x __attribute__ ((mode (SI))); |
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43 |
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44 union double_long { |
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45 double d; |
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46 struct { |
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47 SItype_x upper; |
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48 USItype_x lower; |
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49 } l; |
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50 UDItype_x ll; |
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51 }; |
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52 |
111 | 53 static __inline__ void |
54 fexceptdiv (float d, float e) | |
55 { | |
56 __asm__ __volatile__ ("debr %0,%1" : : "f" (d), "f" (e) ); | |
57 } | |
58 | |
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59 UDItype_x __fixunsdfdi (double a1); |
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60 |
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61 /* convert double to unsigned int */ |
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62 UDItype_x |
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63 __fixunsdfdi (double a1) |
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64 { |
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65 register union double_long dl1; |
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66 register int exp; |
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67 register UDItype_x l; |
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68 |
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69 dl1.d = a1; |
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70 |
111 | 71 /* +/- 0, denormalized */ |
72 if (!EXPD (dl1)) | |
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73 return 0; |
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74 |
111 | 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; | |
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86 |
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87 /* number < 1 */ |
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88 |
111 | 89 if (exp < -PRECISION) |
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90 return 0; |
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91 |
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92 /* NaN */ |
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93 |
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94 if ((EXPD(dl1) == 0x7ff) && (FRACD_LL(dl1) != 0)) /* NaN */ |
111 | 95 { |
96 /* C99 Annex F.4 requires an "invalid" exception to be thrown. */ | |
97 fexceptdiv (0.0, 0.0); | |
98 return 0x0ULL; | |
99 } | |
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100 |
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101 /* Number big number & + inf */ |
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102 |
111 | 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 } | |
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109 |
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110 l = MANTD_LL(dl1); |
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111 |
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112 /* shift down until exp < 12 or l = 0 */ |
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113 if (exp > 0) |
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114 l <<= exp; |
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115 else |
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116 l >>= -exp; |
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117 |
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118 return l; |
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119 } |
111 | 120 #endif /* !__s390x__ */ |