70 lines
1.9 KiB
ArmAsm
70 lines
1.9 KiB
ArmAsm
###################################-*-asm*-
|
|
#
|
|
# Copyright (C) 2009-2015 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
|