1/* Support file for -mfix-vr4120. 2 Copyright (C) 2002, 2004, 2007 Free Software Foundation, Inc. 3 4This file is part of GCC. 5 6GCC is free software; you can redistribute it and/or modify 7it under the terms of the GNU General Public License as published by 8the Free Software Foundation; either version 3, or (at your option) 9any later version. 10 11GCC is distributed in the hope that it will be useful, 12but WITHOUT ANY WARRANTY; without even the implied warranty of 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14GNU General Public License for more details. 15 16You 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 */ ; \ 341:; \ 35 .set noreorder; \ 36 bgez $5,2f /* y >= 0 */ ; \ 37 nop; \ 38 subu $5,$0,$5 /* y = -y */ ; \ 39 .set reorder; \ 402:; \ 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 */ ; \ 463:; \ 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; \ 544: 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 75