Mercurial > hg > CbC > CbC_gcc
annotate libgcc/config/lm32/_divsi3.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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rev | line source |
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1 /* _divsi3 for Lattice Mico32. |
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2 Contributed by Jon Beniston <jon@beniston.com> |
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3 |
145 | 4 Copyright (C) 2009-2020 Free Software Foundation, Inc. |
55
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5 |
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6 This file is free software; you can redistribute it and/or modify it |
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7 under the terms of the GNU General Public License as published by the |
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8 Free Software Foundation; either version 3, or (at your option) any |
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9 later version. |
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10 |
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11 This file is distributed in the hope that it will be useful, but |
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12 WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 General Public License for more details. |
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15 |
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16 Under Section 7 of GPL version 3, you are granted additional |
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17 permissions described in the GCC Runtime Library Exception, version |
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18 3.1, as published by the Free Software Foundation. |
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19 |
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20 You should have received a copy of the GNU General Public License and |
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21 a copy of the GCC Runtime Library Exception along with this program; |
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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23 <http://www.gnu.org/licenses/>. */ |
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24 |
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25 #include "libgcc_lm32.h" |
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26 |
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27 /* Signed integer division. */ |
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28 |
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29 static const UQItype __divsi3_table[] = { |
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30 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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31 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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32 0, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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33 0, 3, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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34 0, 4, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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35 0, 5, 2, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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36 0, 6, 3, 2, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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37 0, 7, 3, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, |
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38 0, 8, 4, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, |
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39 0, 9, 4, 3, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, |
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40 0, 10, 5, 3, 2, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, |
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41 0, 11, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, |
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42 0, 12, 6, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 0, 0, 0, |
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43 0, 13, 6, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 0, 0, |
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44 0, 14, 7, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 0, |
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45 0, 15, 7, 5, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, |
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46 }; |
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47 |
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48 SItype |
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49 __divsi3 (SItype a, SItype b) |
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50 { |
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51 int neg = 0; |
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52 SItype res; |
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53 int cfg; |
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54 |
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55 if (b == 0) |
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56 { |
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57 /* Raise divide by zero exception. */ |
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58 int eba, sr; |
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59 /* Save interrupt enable. */ |
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60 __asm__ __volatile__ ("rcsr %0, IE":"=r" (sr)); |
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61 sr = (sr & 1) << 1; |
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62 __asm__ __volatile__ ("wcsr IE, %0"::"r" (sr)); |
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63 /* Branch to exception handler. */ |
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64 __asm__ __volatile__ ("rcsr %0, EBA":"=r" (eba)); |
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65 eba += 32 * 5; |
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66 __asm__ __volatile__ ("mv ea, ra"); |
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67 __asm__ __volatile__ ("b %0"::"r" (eba)); |
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68 __builtin_unreachable (); |
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69 } |
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70 |
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71 if (((USItype) (a | b)) < 16) |
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72 res = __divsi3_table[(a << 4) + b]; |
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73 else |
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74 { |
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75 |
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76 if (a < 0) |
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77 { |
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78 a = -a; |
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79 neg = !neg; |
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80 } |
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81 |
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82 if (b < 0) |
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83 { |
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84 b = -b; |
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85 neg = !neg; |
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86 } |
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87 |
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88 __asm__ ("rcsr %0, CFG":"=r" (cfg)); |
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89 if (cfg & 2) |
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90 __asm__ ("divu %0, %1, %2": "=r" (res):"r" (a), "r" (b)); |
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91 else |
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92 res = __udivmodsi4 (a, b, 0); |
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93 |
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94 if (neg) |
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95 res = -res; |
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96 } |
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97 |
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98 return res; |
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99 } |