Mercurial > hg > CbC > CbC_gcc

annotate libgcc/config/lm32/_modsi3.c @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents 77e2b8dfacca
children 84e7813d76e9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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
111
kono
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4 Copyright (C) 2009-2017 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 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 }