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David Howellsfc263612008-07-04 09:59:47 -07001/* __ucmpdi2.S: 64-bit unsigned compare
2 *
3 * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12
13 .text
14 .p2align 4
15
16###############################################################################
17#
18# int __ucmpdi2(unsigned long long a [D0:D1],
19# unsigned long long b [(SP,12),(SP,16)])
20#
21# - returns 0, 1, or 2 as a <, =, > b respectively.
22#
23###############################################################################
24 .globl __ucmpdi2
25 .type __ucmpdi2,@function
26__ucmpdi2:
27 mov (12,sp),a0 # b.lsw
28 mov (16,sp),a1 # b.msw
29
30 sub a0,d0
31 subc a1,d1 # may clear Z, never sets it
32 bne __ucmpdi2_differ # a.msw != b.msw
33 mov +1,d0
34 rets
35
36__ucmpdi2_differ:
37 # C flag is set if LE, clear if GE
38 subc d0,d0 # -1 if LE, 0 if GE
39 add +1,d0 # 0 if LE, 1 if GE
40 add d0,d0 # 0 if LE, 2 if GE
41 rets
42
43 .size __ucmpdi2, .-__ucmpdi2