1/* Support file for -mfix-vr4120. 2 Copyright (C) 2002-2015 Free Software Foundation, Inc. 3 4This file is part of GCC. 5 6GCC is free software; you can redistribute it and/or modify it under 7the terms of the GNU General Public License as published by the Free 8Software Foundation; either version 3, or (at your option) any later 9version. 10 11GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12WARRANTY; without even the implied warranty of MERCHANTABILITY or 13FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14for more details. 15 16Under Section 7 of GPL version 3, you are granted additional 17permissions described in the GCC Runtime Library Exception, version 183.1, as published by the Free Software Foundation. 19 20You should have received a copy of the GNU General Public License and 21a copy of the GCC Runtime Library Exception along with this program; 22see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23<http://www.gnu.org/licenses/>. */ 24 25/* This file contains functions which implement divsi3 and modsi3 for 26 -mfix-vr4120. div and ddiv do not give the correct result when one 27 of the operands is negative. */ 28 29 .set nomips16 30 31#define DIV \ 32 xor $3,$4,$5 /* t = x ^ y */ ; \ 33 li $2,0x80000000; \ 34 .set noreorder; \ 35 bgez $4,1f /* x >= 0 */; \ 36 and $3,$3,$2 /* t = (x ^ y) & 0x80000000 in delay slot */ ;\ 37 .set reorder; \ 38 subu $4,$0,$4 /* x = -x */ ; \ 391:; \ 40 .set noreorder; \ 41 bgez $5,2f /* y >= 0 */ ; \ 42 nop; \ 43 subu $5,$0,$5 /* y = -y */ ; \ 44 .set reorder; \ 452:; \ 46 divu $0,$4,$5; /* we use divu because of INT_MIN */ \ 47 .set noreorder; \ 48 bne $5,$0,3f; \ 49 nop; \ 50 break 7 /* division on zero y */ ; \ 513:; \ 52 .set reorder; \ 53 mflo $2 /* r = x / y */ ; \ 54 .set noreorder; \ 55 beq $3,$0,4f /* t == 0 */ ; \ 56 nop; \ 57 subu $2,$0,$2 /* r = -r */ ; \ 58 .set reorder; \ 594: 60 61 .globl __vr4120_divsi3 62 .ent __vr4120_divsi3 63__vr4120_divsi3: 64 DIV 65 j $31 66 .end __vr4120_divsi3 67 68 .globl __vr4120_modsi3 69 .ent __vr4120_modsi3 70__vr4120_modsi3: 71 move $6,$4 # x1 = x 72 move $7,$5 # y1 = y 73 DIV 74 mult $2,$7 # r = r * y1 75 mflo $2 76 .set noreorder 77 j $31 78 subu $2,$6,$2 # r = x1 - r in delay slot 79 .end __vr4120_modsi3 80