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06dc4de1 A |
1 | #------------------------------------------------------------------------------ |
2 | # | |
d6ebcab7 | 3 | # Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR> |
06dc4de1 | 4 | # |
d6ebcab7 | 5 | # This program and the accompanying materials |
06dc4de1 A |
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 | ||
2ac288f9 | 15 | .text |
16 | .align 2 | |
17 | GCC_ASM_EXPORT(__clzsi2) | |
4e471bfd | 18 | |
19 | ASM_PFX(__clzsi2): | |
2ac288f9 | 20 | @ frame_needed = 1, uses_anonymous_args = 0 |
21 | stmfd sp!, {r7, lr} | |
22 | add r7, sp, #0 | |
23 | movs r3, r0, lsr #16 | |
24 | movne r3, #16 | |
25 | moveq r3, #0 | |
26 | movne r9, #0 | |
27 | moveq r9, #16 | |
28 | mov r3, r0, lsr r3 | |
29 | tst r3, #65280 | |
30 | movne r0, #8 | |
31 | moveq r0, #0 | |
32 | movne lr, #0 | |
33 | moveq lr, #8 | |
34 | mov r3, r3, lsr r0 | |
35 | tst r3, #240 | |
36 | movne r0, #4 | |
37 | moveq r0, #0 | |
38 | movne ip, #0 | |
39 | moveq ip, #4 | |
40 | mov r3, r3, lsr r0 | |
41 | tst r3, #12 | |
42 | movne r0, #2 | |
43 | moveq r0, #0 | |
44 | movne r1, #0 | |
45 | moveq r1, #2 | |
46 | mov r2, r3, lsr r0 | |
47 | add r3, lr, r9 | |
48 | add r0, r3, ip | |
49 | add r1, r0, r1 | |
50 | mov r0, r2, lsr #1 | |
51 | eor r0, r0, #1 | |
52 | ands r0, r0, #1 | |
53 | mvnne r0, #0 | |
54 | rsb r3, r2, #2 | |
55 | and r0, r0, r3 | |
56 | add r0, r1, r0 | |
57 | ldmfd sp!, {r7, pc} |