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06dc4de1 A |
1 | #------------------------------------------------------------------------------ |
2 | # | |
3 | # Copyright (c) 2008-2010 Apple Inc. All rights reserved. | |
4 | # | |
5 | # All rights reserved. This program and the accompanying materials | |
6 | # are licensed and made available under the terms and conditions of the BSD License | |
7 | # which accompanies this distribution. The full text of the license may be found at | |
8 | # http://opensource.org/licenses/bsd-license.php | |
9 | # | |
10 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
11 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
12 | # | |
13 | #------------------------------------------------------------------------------ | |
14 | ||
15 | .text | |
16 | .align 2 | |
17 | .globl ___ctzsi2 | |
18 | ___ctzsi2: | |
19 | @ args = 0, pretend = 0, frame = 0 | |
20 | @ frame_needed = 0, uses_anonymous_args = 0 | |
21 | @ link register save eliminated. | |
22 | uxth r3, r0 | |
23 | cmp r3, #0 | |
24 | moveq ip, #16 | |
25 | movne ip, #0 | |
26 | @ lr needed for prologue | |
27 | mov r0, r0, lsr ip | |
28 | tst r0, #255 | |
29 | movne r3, #0 | |
30 | moveq r3, #8 | |
31 | mov r0, r0, lsr r3 | |
32 | tst r0, #15 | |
33 | movne r1, #0 | |
34 | moveq r1, #4 | |
35 | add r3, r3, ip | |
36 | mov r0, r0, lsr r1 | |
37 | tst r0, #3 | |
38 | movne r2, #0 | |
39 | moveq r2, #2 | |
40 | add r3, r3, r1 | |
41 | mov r0, r0, lsr r2 | |
42 | and r0, r0, #3 | |
43 | add r2, r3, r2 | |
44 | eor r3, r0, #1 | |
45 | mov r0, r0, lsr #1 | |
46 | ands r3, r3, #1 | |
47 | mvnne r3, #0 | |
48 | rsb r0, r0, #2 | |
49 | and r0, r3, r0 | |
50 | add r0, r2, r0 | |
51 | bx lr |