53 строки
1.3 KiB
ArmAsm
53 строки
1.3 KiB
ArmAsm
|
/* MN10300 64-bit arithmetic right shift
|
||
|
|
*
|
||
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
||
|
|
* Written by David Howells (dhowells@redhat.com)
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU General Public Licence
|
||
|
|
* as published by the Free Software Foundation; either version
|
||
|
|
* 2 of the Licence, or (at your option) any later version.
|
||
|
|
*/
|
||
|
|
#include <asm/cache.h>
|
||
|
|
|
||
|
|
.text
|
||
|
|
.balign L1_CACHE_BYTES
|
||
|
|
|
||
|
|
###############################################################################
|
||
|
|
#
|
||
|
|
# unsigned long long __ashrdi3(unsigned long long value [D1:D0],
|
||
|
|
# unsigned by [(12,SP)])
|
||
|
|
#
|
||
|
|
###############################################################################
|
||
|
|
.globl __ashrdi3
|
||
|
|
.type __ashrdi3,@function
|
||
|
|
__ashrdi3:
|
||
|
|
mov (12,sp),a0
|
||
|
|
and +63,a0
|
||
|
|
beq __ashrdi3_zero
|
||
|
|
|
||
|
|
cmp +31,a0
|
||
|
|
bhi __ashrdi3_32plus
|
||
|
|
|
||
|
|
# the count is in the range 1-31
|
||
|
|
lsr a0,d0
|
||
|
|
|
||
|
|
mov +32,a1
|
||
|
|
sub a0,a1,a1 # a1 = 32 - count
|
||
|
|
asl a1,d1,a1 # get underflow from MSW -> LSW
|
||
|
|
|
||
|
|
or_asr a1,d0,a0,d1 # insert underflow into LSW and
|
||
|
|
# shift the MSW
|
||
|
|
rets
|
||
|
|
|
||
|
|
.balign L1_CACHE_BYTES
|
||
|
|
# the count is in the range 32-63
|
||
|
|
__ashrdi3_32plus:
|
||
|
|
asr a0,d1,d0
|
||
|
|
ext d0 # sign-extend result through MDR
|
||
|
|
mov mdr,d1
|
||
|
|
__ashrdi3_zero:
|
||
|
|
rets
|
||
|
|
|
||
|
|
.size __ashrdi3, .-__ashrdi3
|