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1 /* Support file for -mfix-vr4120.
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2 Copyright (C) 2002, 2004, 2007 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 GCC is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 /* This file contains functions which implement divsi3 and modsi3 for
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21 -mfix-vr4120. div and ddiv do not give the correct result when one
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22 of the operands is negative. */
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23
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24 .set nomips16
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25
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26 #define DIV \
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27 xor $3,$4,$5 /* t = x ^ y */ ; \
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28 li $2,0x80000000; \
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29 .set noreorder; \
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30 bgez $4,1f /* x >= 0 */; \
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31 and $3,$3,$2 /* t = (x ^ y) & 0x80000000 in delay slot */ ;\
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32 .set reorder; \
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33 subu $4,$0,$4 /* x = -x */ ; \
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34 1:; \
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35 .set noreorder; \
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36 bgez $5,2f /* y >= 0 */ ; \
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37 nop; \
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38 subu $5,$0,$5 /* y = -y */ ; \
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39 .set reorder; \
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40 2:; \
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41 divu $0,$4,$5; /* we use divu because of INT_MIN */ \
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42 .set noreorder; \
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43 bne $5,$0,3f; \
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44 nop; \
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45 break 7 /* division on zero y */ ; \
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46 3:; \
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47 .set reorder; \
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48 mflo $2 /* r = x / y */ ; \
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49 .set noreorder; \
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50 beq $3,$0,4f /* t == 0 */ ; \
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51 nop; \
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52 subu $2,$0,$2 /* r = -r */ ; \
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53 .set reorder; \
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54 4:
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55
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56 .globl __vr4120_divsi3
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57 .ent __vr4120_divsi3
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58 __vr4120_divsi3:
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59 DIV
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60 j $31
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61 .end __vr4120_divsi3
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62
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63 .globl __vr4120_modsi3
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64 .ent __vr4120_modsi3
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65 __vr4120_modsi3:
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66 move $6,$4 # x1 = x
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67 move $7,$5 # y1 = y
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68 DIV
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69 mult $2,$7 # r = r * y1
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70 mflo $2
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71 .set noreorder
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72 j $31
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73 subu $2,$6,$2 # r = x1 - r in delay slot
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74 .end __vr4120_modsi3
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