Mercurial > hg > CbC > CbC_gcc
comparison gcc/config/mips/vr4120-div.S @ 0:a06113de4d67
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| author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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| date | Fri, 17 Jul 2009 14:47:48 +0900 |
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| -1:000000000000 | 0:a06113de4d67 |
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| 1 /* Support file for -mfix-vr4120. | |
| 2 Copyright (C) 2002, 2004, 2007 Free Software Foundation, Inc. | |
| 3 | |
| 4 This file is part of GCC. | |
| 5 | |
| 6 GCC is free software; you can redistribute it and/or modify | |
| 7 it under the terms of the GNU General Public License as published by | |
| 8 the Free Software Foundation; either version 3, or (at your option) | |
| 9 any later version. | |
| 10 | |
| 11 GCC is distributed in the hope that it will be useful, | |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 GNU General Public License for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with GCC; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 /* This file contains functions which implement divsi3 and modsi3 for | |
| 21 -mfix-vr4120. div and ddiv do not give the correct result when one | |
| 22 of the operands is negative. */ | |
| 23 | |
| 24 .set nomips16 | |
| 25 | |
| 26 #define DIV \ | |
| 27 xor $3,$4,$5 /* t = x ^ y */ ; \ | |
| 28 li $2,0x80000000; \ | |
| 29 .set noreorder; \ | |
| 30 bgez $4,1f /* x >= 0 */; \ | |
| 31 and $3,$3,$2 /* t = (x ^ y) & 0x80000000 in delay slot */ ;\ | |
| 32 .set reorder; \ | |
| 33 subu $4,$0,$4 /* x = -x */ ; \ | |
| 34 1:; \ | |
| 35 .set noreorder; \ | |
| 36 bgez $5,2f /* y >= 0 */ ; \ | |
| 37 nop; \ | |
| 38 subu $5,$0,$5 /* y = -y */ ; \ | |
| 39 .set reorder; \ | |
| 40 2:; \ | |
| 41 divu $0,$4,$5; /* we use divu because of INT_MIN */ \ | |
| 42 .set noreorder; \ | |
| 43 bne $5,$0,3f; \ | |
| 44 nop; \ | |
| 45 break 7 /* division on zero y */ ; \ | |
| 46 3:; \ | |
| 47 .set reorder; \ | |
| 48 mflo $2 /* r = x / y */ ; \ | |
| 49 .set noreorder; \ | |
| 50 beq $3,$0,4f /* t == 0 */ ; \ | |
| 51 nop; \ | |
| 52 subu $2,$0,$2 /* r = -r */ ; \ | |
| 53 .set reorder; \ | |
| 54 4: | |
| 55 | |
| 56 .globl __vr4120_divsi3 | |
| 57 .ent __vr4120_divsi3 | |
| 58 __vr4120_divsi3: | |
| 59 DIV | |
| 60 j $31 | |
| 61 .end __vr4120_divsi3 | |
| 62 | |
| 63 .globl __vr4120_modsi3 | |
| 64 .ent __vr4120_modsi3 | |
| 65 __vr4120_modsi3: | |
| 66 move $6,$4 # x1 = x | |
| 67 move $7,$5 # y1 = y | |
| 68 DIV | |
| 69 mult $2,$7 # r = r * y1 | |
| 70 mflo $2 | |
| 71 .set noreorder | |
| 72 j $31 | |
| 73 subu $2,$6,$2 # r = x1 - r in delay slot | |
| 74 .end __vr4120_modsi3 |