Mercurial > hg > CbC > CbC_gcc
annotate libgcc/config/s390/32/_fixdfdi.c @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
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date | Fri, 12 Feb 2010 23:39:51 +0900 |
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children | 04ced10e8804 |
rev | line source |
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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, 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 EXPD(fp) (((fp.l.upper) >> 20) & 0x7FF) |
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29 #define EXCESSD 1022 |
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30 #define SIGNBIT 0x80000000 |
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31 #define SIGND(fp) ((fp.l.upper) & SIGNBIT) |
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32 #define MANTD_LL(fp) ((fp.ll & (HIDDEND_LL-1)) | HIDDEND_LL) |
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33 #define FRACD_LL(fp) (fp.ll & (HIDDEND_LL-1)) |
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34 #define HIDDEND_LL ((UDItype_x)1 << 52) |
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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 double_long { |
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42 double d; |
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43 struct { |
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44 SItype_x upper; |
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45 USItype_x lower; |
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46 } l; |
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47 UDItype_x ll; |
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48 }; |
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49 |
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50 DItype_x __fixdfdi (double a1); |
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51 |
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52 /* convert double to int */ |
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53 DItype_x |
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54 __fixdfdi (double a1) |
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55 { |
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56 register union double_long dl1; |
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57 register int exp; |
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58 register DItype_x l; |
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59 |
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60 dl1.d = a1; |
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61 |
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62 /* +/- 0, denormalized */ |
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63 |
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64 if (!EXPD (dl1)) |
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65 return 0; |
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66 |
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67 exp = EXPD (dl1) - EXCESSD - 53; |
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68 |
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69 /* number < 1 */ |
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70 |
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71 if (exp < -53) |
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72 return 0; |
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73 |
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74 /* NaN */ |
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75 |
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76 if ((EXPD(dl1) == 0x7ff) && (FRACD_LL(dl1) != 0)) /* NaN */ |
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77 return 0x8000000000000000ULL; |
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78 |
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79 /* Number big number & +/- inf */ |
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80 |
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81 if (exp >= 11) { |
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82 l = (long long)1<<63; |
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83 if (!SIGND(dl1)) |
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84 l--; |
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85 return l; |
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86 } |
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87 |
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88 l = MANTD_LL(dl1); |
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89 |
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90 /* shift down until exp < 12 or l = 0 */ |
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91 if (exp > 0) |
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92 l <<= exp; |
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93 else |
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94 l >>= -exp; |
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95 |
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96 return (SIGND (dl1) ? -l : l); |
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97 } |