80 lines
2.2 KiB
ArmAsm
80 lines
2.2 KiB
ArmAsm
/* Support file for -mfix-vr4120.
|
|
Copyright (C) 2002-2016 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/>. */
|
|
|
|
/* 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
|