Mercurial > hg > CbC > CbC_gcc
annotate libgcc/config/lm32/_modsi3.c @ 55:77e2b8dfacca gcc-4.4.5
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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 |
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55
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1 /* _modsi3 for Lattice Mico32. |
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2 Contributed by Jon Beniston <jon@beniston.com> |
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3 |
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4 Copyright (C) 2009 Free Software Foundation, Inc. |
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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 modulus. */ |
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28 |
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29 SItype |
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30 __modsi3 (SItype a, SItype b) |
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31 { |
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32 int neg = 0; |
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33 SItype res; |
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34 int cfg; |
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35 |
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36 if (b == 0) |
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37 { |
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38 /* Raise divide by zero exception. */ |
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39 int eba, sr; |
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40 /* Save interrupt enable. */ |
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41 __asm__ __volatile__ ("rcsr %0, IE":"=r" (sr)); |
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42 sr = (sr & 1) << 1; |
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43 __asm__ __volatile__ ("wcsr IE, %0"::"r" (sr)); |
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44 /* Branch to exception handler. */ |
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45 __asm__ __volatile__ ("rcsr %0, EBA":"=r" (eba)); |
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46 eba += 32 * 5; |
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47 __asm__ __volatile__ ("mv ea, ra"); |
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48 __asm__ __volatile__ ("b %0"::"r" (eba)); |
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49 __builtin_unreachable (); |
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50 } |
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51 |
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52 if (a < 0) |
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53 { |
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54 a = -a; |
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55 neg = 1; |
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56 } |
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57 |
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58 if (b < 0) |
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59 b = -b; |
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60 |
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61 __asm__ ("rcsr %0, CFG":"=r" (cfg)); |
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62 if (cfg & 2) |
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63 __asm__ ("modu %0, %1, %2": "=r" (res):"r" (a), "r" (b)); |
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64 else |
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65 res = __udivmodsi4 (a, b, 1); |
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66 |
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67 if (neg) |
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68 res = -res; |
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69 |
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70 return res; |
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71 } |