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| Current File : //compat/linux/proc/68247/root/usr/src/contrib/gcc/config/mips/vr4120-div.S |
/* Support file for -mfix-vr4120. Copyright (C) 2002, 2004 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 2, 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. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING. If not, write to the Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ /* 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