| /* Support file for -mfix-vr4120. |
| Copyright (C) 2002-2023 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under |
| the terms of the GNU General Public License as published by the Free |
| Software Foundation; either version 3, or (at your option) any later |
| version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| for more details. |
| |
| Under Section 7 of GPL version 3, you are granted additional |
| permissions described in the GCC Runtime Library Exception, version |
| 3.1, as published by the Free Software Foundation. |
| |
| You should have received a copy of the GNU General Public License and |
| a copy of the GCC Runtime Library Exception along with this program; |
| see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* An executable stack is *not* required for these functions. */ |
| #include "gnustack.h" |
| |
| /* This file contains functions which implement divsi3 and modsi3 for |
| -mfix-vr4120. div and ddiv do not give the correct result when one |
| of the operands is negative. */ |
| |
| .set nomips16 |
| |
| #define DIV \ |
| xor $3,$4,$5 /* t = x ^ y */ ; \ |
| li $2,0x80000000; \ |
| .set noreorder; \ |
| bgez $4,1f /* x >= 0 */; \ |
| and $3,$3,$2 /* t = (x ^ y) & 0x80000000 in delay slot */ ;\ |
| .set reorder; \ |
| subu $4,$0,$4 /* x = -x */ ; \ |
| 1:; \ |
| .set noreorder; \ |
| bgez $5,2f /* y >= 0 */ ; \ |
| nop; \ |
| subu $5,$0,$5 /* y = -y */ ; \ |
| .set reorder; \ |
| 2:; \ |
| divu $0,$4,$5; /* we use divu because of INT_MIN */ \ |
| .set noreorder; \ |
| bne $5,$0,3f; \ |
| nop; \ |
| break 7 /* division on zero y */ ; \ |
| 3:; \ |
| .set reorder; \ |
| mflo $2 /* r = x / y */ ; \ |
| .set noreorder; \ |
| beq $3,$0,4f /* t == 0 */ ; \ |
| nop; \ |
| subu $2,$0,$2 /* r = -r */ ; \ |
| .set reorder; \ |
| 4: |
| |
| .globl __vr4120_divsi3 |
| .ent __vr4120_divsi3 |
| __vr4120_divsi3: |
| DIV |
| j $31 |
| .end __vr4120_divsi3 |
| |
| .globl __vr4120_modsi3 |
| .ent __vr4120_modsi3 |
| __vr4120_modsi3: |
| move $6,$4 # x1 = x |
| move $7,$5 # y1 = y |
| DIV |
| mult $2,$7 # r = r * y1 |
| mflo $2 |
| .set noreorder |
| j $31 |
| subu $2,$6,$2 # r = x1 - r in delay slot |
| .end __vr4120_modsi3 |
