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annotate libgcc/config/s390/32/_fixunssfdi.c @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents 77e2b8dfacca
children 84e7813d76e9
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55
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1 /* Definitions of target machine for GNU compiler, for IBM S/390
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2 Copyright (C) 1999-2017 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
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27 #ifndef __s390x__
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28
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29 #define EXPONENT_BIAS 127
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30 #define MANTISSA_BITS 23
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31 #define EXP(fp) (((fp.l) >> MANTISSA_BITS) & 0xFF)
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32 #define SIGNBIT 0x80000000
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33 #define SIGN(fp) ((fp.l) & SIGNBIT)
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34 #define HIDDEN (1 << MANTISSA_BITS)
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35 #define MANT(fp) (((fp.l) & 0x7FFFFF) | HIDDEN)
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36 #define FRAC(fp) ((fp.l) & 0x7FFFFF)
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37
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38 typedef int DItype_x __attribute__ ((mode (DI)));
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39 typedef unsigned int UDItype_x __attribute__ ((mode (DI)));
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40 typedef int SItype_x __attribute__ ((mode (SI)));
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41 typedef unsigned int USItype_x __attribute__ ((mode (SI)));
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42
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43 union float_long
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44 {
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45 float f;
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46 USItype_x l;
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47 };
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48
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49 static __inline__ void
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50 fexceptdiv (float d, float e)
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51 {
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52 __asm__ __volatile__ ("debr %0,%1" : : "f" (d), "f" (e) );
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53 }
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54
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55 UDItype_x __fixunssfdi (float a1);
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56
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57 /* convert float to unsigned int */
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58 UDItype_x
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59 __fixunssfdi (float a1)
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60 {
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61 register union float_long fl1;
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62 register int exp;
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63 register UDItype_x l;
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64
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65 fl1.f = a1;
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66
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67 /* +/- 0, denormalized */
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68 if (!EXP (fl1))
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69 return 0;
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70
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71 /* Negative. */
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72 if (SIGN (fl1))
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73 {
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74 /* Value is <= -1.0
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75 C99 Annex F.4 requires an "invalid" exception to be thrown. */
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76 if (EXP (fl1) >= EXPONENT_BIAS)
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77 fexceptdiv (0.0, 0.0);
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78 return 0;
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79 }
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80
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81 exp = EXP (fl1) - EXPONENT_BIAS - MANTISSA_BITS;
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82
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83 /* number < 1 */
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84 if (exp < -24)
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85 return 0;
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86
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87 /* NaN */
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88
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89 if ((EXP (fl1) == 0xff) && (FRAC (fl1) != 0)) /* NaN */
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90 {
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91 /* C99 Annex F.4 requires an "invalid" exception to be thrown. */
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92 fexceptdiv (0.0, 0.0);
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93 return 0x0ULL;
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94 }
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95
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96 /* Number big number & + inf */
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97
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98 if (exp >= 41)
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99 {
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100 /* C99 Annex F.4 requires an "invalid" exception to be thrown. */
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101 fexceptdiv (0.0, 0.0);
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102 return 0xFFFFFFFFFFFFFFFFULL;
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103 }
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104
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105 l = MANT (fl1);
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106
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107 if (exp > 0)
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108 l <<= exp;
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109 else
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110 l >>= -exp;
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111
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112 return l;
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113 }
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114 #endif /* !__s390x__ */