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div.asm
98 lines (93 loc) · 1.94 KB
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div.asm
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/* Copyright (c) 2012 Jörg Mische <bobbl@gmx.de>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
.global __aeabi_idiv
.global __aeabi_idivmod
.global __aeabi_uidiv
.global __aeabi_uidivmod
.text
__aeabi_idiv:
cmp r0, #0
bge .Lnum_pos
rsbs r0, r0, #0
cmp r1, #0
bge .Lneg_result
rsbs r1, r1, #0
b __aeabi_uidivmod
.Lnum_pos:
cmp r1, #0
bge __aeabi_uidivmod
rsbs r1, r1, #0
.Lneg_result:
push {lr}
bl __aeabi_uidivmod
rsbs r0, r0, #0
pop {pc}
__aeabi_idivmod:
cmp r0, #0
bge .Lnum_pos_bis
rsbs r0, r0, #0
cmp r1, #0
bge .Lneg_both
rsbs r1, r1, #0
push {lr}
bl __aeabi_uidivmod
rsbs r1, r1, #0
pop {pc}
.Lneg_both:
push {lr}
bl __aeabi_uidivmod
rsbs r0, r0, #0
rsbs r1, r1, #0
pop {pc}
.Lnum_pos_bis:
cmp r1, #0
bge __aeabi_uidivmod
rsbs r1, r1, #0
push {lr}
bl __aeabi_uidivmod
rsbs r0, r0, #0
pop {pc}
__aeabi_uidiv:
__aeabi_uidivmod:
cmp r1, #0
bne .Lno_div0
b __aeabi_idiv0
.Lno_div0:
movs r2, #1
movs r3, #0
cmp r0, r1
bls .Lsub_loop0
adds r1, #0
bmi .Lsub_loop0
.Ldenom_shift_loop:
lsls r2, #1
lsls r1, #1
bmi .Lsub_loop0
cmp r0, r1
bhi .Ldenom_shift_loop
.Lsub_loop0:
cmp r0, r1
bcc .Ldont_sub0
subs r0, r1
orrs r3, r2
.Ldont_sub0:
lsrs r1, #1
lsrs r2, #1
bne .Lsub_loop0
mov r1, r0
mov r0, r3
bx lr
__aeabi_idiv0:
bl __aeabi_idiv0