1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
###################################-*-asm*-
#
# Copyright (C) 2009-2016 Free Software Foundation, Inc.
#
# Contributed by Michael Eager <eager@eagercon.com>.
#
# This file 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/>.
#
# mulsi3.S
#
# Multiply operation for 32 bit integers.
# Input : Operand1 in Reg r5
# Operand2 in Reg r6
# Output: Result [op1 * op2] in Reg r3
#
#######################################
.globl __mulsi3
.ent __mulsi3
.type __mulsi3,@function
__mulsi3:
.frame r1,0,r15
add r3,r0,r0
BEQI r5,$L_Result_Is_Zero # Multiply by Zero
BEQI r6,$L_Result_Is_Zero # Multiply by Zero
BGEId r5,$L_R5_Pos
XOR r4,r5,r6 # Get the sign of the result
RSUBI r5,r5,0 # Make r5 positive
$L_R5_Pos:
BGEI r6,$L_R6_Pos
RSUBI r6,r6,0 # Make r6 positive
$L_R6_Pos:
bri $L1
$L2:
add r5,r5,r5
$L1:
srl r6,r6
addc r7,r0,r0
beqi r7,$L2
bneid r6,$L2
add r3,r3,r5
blti r4,$L_NegateResult
rtsd r15,8
nop
$L_NegateResult:
rtsd r15,8
rsub r3,r3,r0
$L_Result_Is_Zero:
rtsd r15,8
addi r3,r0,0
.end __mulsi3
.size __mulsi3, . - __mulsi3
|
