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e1f414b6 | 1 | /** @file\r |
2 | 64-bit arithmetic right shift function for IA-32.\r | |
3 | \r | |
88a75d26 | 4 | Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>\r |
bb817c56 | 5 | This program and the accompanying materials\r |
e1f414b6 | 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 | |
35a17154 | 8 | http://opensource.org/licenses/bsd-license.php.\r |
e1f414b6 | 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 | |
1efcc4ae | 15 | \r |
f734a10a | 16 | \r |
e1f414b6 | 17 | \r |
42eedea9 | 18 | /**\r |
19 | Shifts a 64-bit integer right between 0 and 63 bits. The high bits\r | |
20 | are filled with original integer's bit 63. The shifted value is returned.\r | |
21 | \r | |
22 | This function shifts the 64-bit value Operand to the right by Count bits. The\r | |
23 | high Count bits are set to bit 63 of Operand. The shifted value is returned.\r | |
24 | \r | |
25 | @param Operand The 64-bit operand to shift right.\r | |
26 | @param Count The number of bits to shift right.\r | |
27 | \r | |
35a17154 | 28 | @return Operand arithmetically shifted right by Count.\r |
42eedea9 | 29 | \r |
30 | **/\r | |
e1f414b6 | 31 | UINT64\r |
32 | EFIAPI\r | |
33 | InternalMathARShiftU64 (\r | |
34 | IN UINT64 Operand,\r | |
35 | IN UINTN Count\r | |
36 | )\r | |
37 | {\r | |
38 | _asm {\r | |
39 | mov cl, byte ptr [Count]\r | |
40 | mov eax, dword ptr [Operand + 4]\r | |
41 | cdq\r | |
42 | test cl, 32\r | |
88a75d26 MK |
43 | jnz L0\r |
44 | mov edx, eax\r | |
45 | mov eax, dword ptr [Operand + 0]\r | |
46 | L0:\r | |
e1f414b6 | 47 | shrd eax, edx, cl\r |
48 | sar edx, cl\r | |
49 | }\r | |
50 | }\r | |
51 | \r |