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annotate libgcc/config/s390/32/_fixunssfdi.c @ 55:77e2b8dfacca gcc-4.4.5

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update it from 4.4.3 to 4.5.0
author ryoma <e075725@ie.u-ryukyu.ac.jp>
date Fri, 12 Feb 2010 23:39:51 +0900
parents
children 04ced10e8804
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rev   line source
55
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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1 /* Definitions of target machine for GNU compiler, for IBM S/390
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2 Copyright (C) 1999, 2000, 2001, 2007, 2008 and 2009
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3 Free Software Foundation, Inc.
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4 Contributed by Hartmut Penner (hpenner@de.ibm.com) and
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5 Ulrich Weigand (uweigand@de.ibm.com).
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6
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7 This file is part of GCC.
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8
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9 GCC is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License as published by the Free
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11 Software Foundation; either version 3, or (at your option) any later
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12 version.
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13
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14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 Under Section 7 of GPL version 3, you are granted additional
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20 permissions described in the GCC Runtime Library Exception, version
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21 3.1, as published by the Free Software Foundation.
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22
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23 You should have received a copy of the GNU General Public License and
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24 a copy of the GCC Runtime Library Exception along with this program;
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25 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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26 <http://www.gnu.org/licenses/>. */
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27
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28 #define EXP(fp) (((fp.l) >> 23) & 0xFF)
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29 #define EXCESS 126
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30 #define SIGNBIT 0x80000000
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31 #define SIGN(fp) ((fp.l) & SIGNBIT)
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32 #define HIDDEN (1 << 23)
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33 #define MANT(fp) (((fp.l) & 0x7FFFFF) | HIDDEN)
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34 #define FRAC(fp) ((fp.l) & 0x7FFFFF)
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35
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36 typedef int DItype_x __attribute__ ((mode (DI)));
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37 typedef unsigned int UDItype_x __attribute__ ((mode (DI)));
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38 typedef int SItype_x __attribute__ ((mode (SI)));
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39 typedef unsigned int USItype_x __attribute__ ((mode (SI)));
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40
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41 union float_long
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42 {
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43 float f;
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44 USItype_x l;
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45 };
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46
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47 UDItype_x __fixunssfdi (float a1);
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48
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49 /* convert float to unsigned int */
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50 UDItype_x
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51 __fixunssfdi (float a1)
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52 {
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53 register union float_long fl1;
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54 register int exp;
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55 register UDItype_x l;
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56
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57 fl1.f = a1;
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58
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59 /* +/- 0, denormalized, negative */
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60
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61 if (!EXP (fl1) || SIGN(fl1))
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62 return 0;
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63
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64 exp = EXP (fl1) - EXCESS - 24;
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65
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66 /* number < 1 */
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67
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68 if (exp < -24)
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69 return 0;
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70
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71 /* NaN */
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72
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73 if ((EXP(fl1) == 0xff) && (FRAC(fl1) != 0)) /* NaN */
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74 return 0x0ULL;
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75
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76 /* Number big number & + inf */
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77
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78 if (exp >= 41) {
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79 return 0xFFFFFFFFFFFFFFFFULL;
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80 }
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81
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82 l = MANT(fl1);
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83
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84 if (exp > 0)
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85 l <<= exp;
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86 else
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87 l >>= -exp;
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88
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89 return l;
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90 }