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b1ff428c | 1 | #------------------------------------------------------------------------------\r |
2 | #\r | |
3 | # Copyright (c) 2006 - 2008, Intel Corporation\r | |
4 | # All rights reserved. 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 | # RShiftU64.S\r | |
15 | #\r | |
16 | # Abstract:\r | |
17 | #\r | |
18 | # 64-bit logical right shift function for IA-32\r | |
19 | #\r | |
20 | #------------------------------------------------------------------------------\r | |
21 | \r | |
22 | .686:\r | |
23 | .code:\r | |
24 | \r | |
132f41f0 | 25 | ASM_GLOBAL ASM_PFX(InternalMathRShiftU64)\r |
b1ff428c | 26 | \r |
27 | #------------------------------------------------------------------------------\r | |
28 | # UINT64\r | |
29 | # EFIAPI\r | |
30 | # InternalMathRShiftU64 (\r | |
31 | # IN UINT64 Operand,\r | |
32 | # IN UINTN Count\r | |
33 | # );\r | |
34 | #------------------------------------------------------------------------------\r | |
35 | ASM_PFX(InternalMathRShiftU64):\r | |
36 | movb 12(%esp), %cl # cl <- Count\r | |
37 | xorl %edx, %edx\r | |
38 | movl 8(%esp), %eax\r | |
39 | testb $32, %cl # Count >= 32?\r | |
40 | cmovz %eax, %edx\r | |
41 | cmovz 0x4(%esp), %eax\r | |
42 | shrdl %cl, %edx, %eax\r | |
43 | shr %cl, %edx\r | |
44 | ret\r |