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1 | #------------------------------------------------------------------------------\r | |
2 | #\r | |
3 | # Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>\r | |
4 | # This program and the accompanying materials\r | |
5 | # are licensed and made available under the terms and conditions of the BSD License\r | |
6 | # which accompanies this distribution. The full text of the license may be found at\r | |
7 | # http://opensource.org/licenses/bsd-license.php.\r | |
8 | #\r | |
9 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
10 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
11 | #\r | |
12 | # Module Name:\r | |
13 | #\r | |
14 | # MathRShiftU64.S\r | |
15 | #\r | |
16 | # Abstract:\r | |
17 | #\r | |
18 | # 64-bit Math Worker Function.\r | |
19 | # Shifts a 64-bit unsigned value right by a certain number of bits.\r | |
20 | #\r | |
21 | #------------------------------------------------------------------------------\r | |
22 | \r | |
23 | \r | |
24 | .686:\r | |
25 | .code:\r | |
26 | \r | |
27 | ASM_GLOBAL ASM_PFX(__ashrdi3)\r | |
28 | \r | |
29 | #------------------------------------------------------------------------------\r | |
30 | #\r | |
31 | # void __cdecl __ashrdi3 (void)\r | |
32 | #\r | |
33 | #------------------------------------------------------------------------------\r | |
34 | ASM_PFX(__ashrdi3):\r | |
35 | #\r | |
36 | # Checking: Only handle 64bit shifting or more\r | |
37 | #\r | |
38 | cmpb $64, %cl\r | |
39 | jae _Exit\r | |
40 | \r | |
41 | #\r | |
42 | # Handle shifting between 0 and 31 bits\r | |
43 | #\r | |
44 | cmpb $32, %cl\r | |
45 | jae More32\r | |
46 | shrd %cl, %edx, %eax\r | |
47 | shr %cl, %edx\r | |
48 | ret\r | |
49 | \r | |
50 | #\r | |
51 | # Handle shifting of 32-63 bits\r | |
52 | #\r | |
53 | More32:\r | |
54 | movl %edx, %eax\r | |
55 | xor %edx, %edx\r | |
56 | and $31, %cl\r | |
57 | shr %cl, %eax\r | |
58 | ret\r | |
59 | \r | |
60 | #\r | |
61 | # Invalid number (less then 32bits), return 0\r | |
62 | #\r | |
63 | _Exit:\r | |
64 | xor %eax, %eax\r | |
65 | xor %edx, %edx\r | |
66 | ret\r |