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3402aac7 | 1 | #------------------------------------------------------------------------------\r |
1e57a462 | 2 | #\r |
3 | # Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r | |
4 | #\r | |
5 | # This program and the accompanying materials\r | |
6 | # are licensed and made available under the terms and conditions of the BSD License\r | |
7 | # which accompanies this distribution. The full text of the license may be found at\r | |
8 | # http://opensource.org/licenses/bsd-license.php\r | |
9 | #\r | |
10 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | #\r | |
13 | #------------------------------------------------------------------------------\r | |
14 | \r | |
903e3124 | 15 | #include <AsmMacroIoLib.h>\r |
3402aac7 | 16 | \r |
903e3124 | 17 | ASM_FUNC(__ctzsi2)\r |
1e57a462 | 18 | uxth r3, r0\r |
19 | cmp r3, #0\r | |
20 | moveq ip, #16\r | |
21 | movne ip, #0\r | |
22 | @ lr needed for prologue\r | |
23 | mov r0, r0, lsr ip\r | |
24 | tst r0, #255\r | |
25 | movne r3, #0\r | |
26 | moveq r3, #8\r | |
27 | mov r0, r0, lsr r3\r | |
28 | tst r0, #15\r | |
29 | movne r1, #0\r | |
30 | moveq r1, #4\r | |
31 | add r3, r3, ip\r | |
32 | mov r0, r0, lsr r1\r | |
33 | tst r0, #3\r | |
34 | movne r2, #0\r | |
35 | moveq r2, #2\r | |
36 | add r3, r3, r1\r | |
37 | mov r0, r0, lsr r2\r | |
38 | and r0, r0, #3\r | |
39 | add r2, r3, r2\r | |
40 | eor r3, r0, #1\r | |
41 | mov r0, r0, lsr #1\r | |
42 | ands r3, r3, #1\r | |
43 | mvnne r3, #0\r | |
44 | rsb r0, r0, #2\r | |
45 | and r0, r3, r0\r | |
46 | add r0, r2, r0\r | |
47 | bx lr\r |