1/* Support file for -mfix-vr4120. 2 Copyright (C) 2002, 2004 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 2, 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 17along with GCC; see the file COPYING. If not, write to 18the Free Software Foundation, 51 Franklin Street, Fifth Floor, 19Boston, MA 02110-1301, USA. */ 20 21/* This file contains functions which implement divsi3 and modsi3 for 22 -mfix-vr4120. div and ddiv do not give the correct result when one 23 of the operands is negative. */ 24 25 .set nomips16 26 27#define DIV \ 28 xor $3,$4,$5 /* t = x ^ y */ ; \ 29 li $2,0x80000000; \ 30 .set noreorder; \ 31 bgez $4,1f /* x >= 0 */; \ 32 and $3,$3,$2 /* t = (x ^ y) & 0x80000000 in delay slot */ ;\ 33 .set reorder; \ 34 subu $4,$0,$4 /* x = -x */ ; \ 351:; \ 36 .set noreorder; \ 37 bgez $5,2f /* y >= 0 */ ; \ 38 nop; \ 39 subu $5,$0,$5 /* y = -y */ ; \ 40 .set reorder; \ 412:; \ 42 divu $0,$4,$5; /* we use divu because of INT_MIN */ \ 43 .set noreorder; \ 44 bne $5,$0,3f; \ 45 nop; \ 46 break 7 /* division on zero y */ ; \ 473:; \ 48 .set reorder; \ 49 mflo $2 /* r = x / y */ ; \ 50 .set noreorder; \ 51 beq $3,$0,4f /* t == 0 */ ; \ 52 nop; \ 53 subu $2,$0,$2 /* r = -r */ ; \ 54 .set reorder; \ 554: 56 57 .globl __vr4120_divsi3 58 .ent __vr4120_divsi3 59__vr4120_divsi3: 60 DIV 61 j $31 62 .end __vr4120_divsi3 63 64 .globl __vr4120_modsi3 65 .ent __vr4120_modsi3 66__vr4120_modsi3: 67 move $6,$4 # x1 = x 68 move $7,$5 # y1 = y 69 DIV 70 mult $2,$7 # r = r * y1 71 mflo $2 72 .set noreorder 73 j $31 74 subu $2,$6,$2 # r = x1 - r in delay slot 75 .end __vr4120_modsi3 76