1/* Support file for -mfix-vr4120. 2 Copyright (C) 2002-2020 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/* An executable stack is *not* required for these functions. */ 26#include "gnustack.h" 27 28/* This file contains functions which implement divsi3 and modsi3 for 29 -mfix-vr4120. div and ddiv do not give the correct result when one 30 of the operands is negative. */ 31 32 .set nomips16 33 34#define DIV \ 35 xor $3,$4,$5 /* t = x ^ y */ ; \ 36 li $2,0x80000000; \ 37 .set noreorder; \ 38 bgez $4,1f /* x >= 0 */; \ 39 and $3,$3,$2 /* t = (x ^ y) & 0x80000000 in delay slot */ ;\ 40 .set reorder; \ 41 subu $4,$0,$4 /* x = -x */ ; \ 421:; \ 43 .set noreorder; \ 44 bgez $5,2f /* y >= 0 */ ; \ 45 nop; \ 46 subu $5,$0,$5 /* y = -y */ ; \ 47 .set reorder; \ 482:; \ 49 divu $0,$4,$5; /* we use divu because of INT_MIN */ \ 50 .set noreorder; \ 51 bne $5,$0,3f; \ 52 nop; \ 53 break 7 /* division on zero y */ ; \ 543:; \ 55 .set reorder; \ 56 mflo $2 /* r = x / y */ ; \ 57 .set noreorder; \ 58 beq $3,$0,4f /* t == 0 */ ; \ 59 nop; \ 60 subu $2,$0,$2 /* r = -r */ ; \ 61 .set reorder; \ 624: 63 64 .globl __vr4120_divsi3 65 .ent __vr4120_divsi3 66__vr4120_divsi3: 67 DIV 68 j $31 69 .end __vr4120_divsi3 70 71 .globl __vr4120_modsi3 72 .ent __vr4120_modsi3 73__vr4120_modsi3: 74 move $6,$4 # x1 = x 75 move $7,$5 # y1 = y 76 DIV 77 mult $2,$7 # r = r * y1 78 mflo $2 79 .set noreorder 80 j $31 81 subu $2,$6,$2 # r = x1 - r in delay slot 82 .end __vr4120_modsi3 83