mirror of https://gitee.com/openkylin/linux.git
44 lines
1.2 KiB
ArmAsm
44 lines
1.2 KiB
ArmAsm
|
/* __ucmpdi2.S: 64-bit unsigned compare
|
||
|
|
*
|
||
|
|
* Copyright (C) 2008 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 License
|
||
|
|
* as published by the Free Software Foundation; either version
|
||
|
|
* 2 of the License, or (at your option) any later version.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
.text
|
||
|
|
.p2align 4
|
||
|
|
|
||
|
|
###############################################################################
|
||
|
|
#
|
||
|
|
# int __ucmpdi2(unsigned long long a [D0:D1],
|
||
|
|
# unsigned long long b [(SP,12),(SP,16)])
|
||
|
|
#
|
||
|
|
# - returns 0, 1, or 2 as a <, =, > b respectively.
|
||
|
|
#
|
||
|
|
###############################################################################
|
||
|
|
.globl __ucmpdi2
|
||
|
|
.type __ucmpdi2,@function
|
||
|
|
__ucmpdi2:
|
||
|
|
mov (12,sp),a0 # b.lsw
|
||
|
|
mov (16,sp),a1 # b.msw
|
||
|
|
|
||
|
|
sub a0,d0
|
||
|
|
subc a1,d1 # may clear Z, never sets it
|
||
|
|
bne __ucmpdi2_differ # a.msw != b.msw
|
||
|
|
mov +1,d0
|
||
|
|
rets
|
||
|
|
|
||
|
|
__ucmpdi2_differ:
|
||
|
|
# C flag is set if LE, clear if GE
|
||
|
|
subc d0,d0 # -1 if LE, 0 if GE
|
||
|
|
add +1,d0 # 0 if LE, 1 if GE
|
||
|
|
add d0,d0 # 0 if LE, 2 if GE
|
||
|
|
rets
|
||
|
|
|
||
|
|
.size __ucmpdi2, .-__ucmpdi2
|