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e1f414b6 | 1 | /** @file\r |
2 | 64-bit left shift function for IA-32.\r | |
3 | \r | |
4 | Copyright (c) 2006 - 2007, Intel Corporation<BR>\r | |
5 | All rights reserved. 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 | |
1efcc4ae | 15 | \r |
f734a10a | 16 | \r |
e1f414b6 | 17 | \r |
42eedea9 | 18 | /**\r |
19 | Shifts a 64-bit integer left between 0 and 63 bits. The low bits\r | |
20 | are filled with zeros. The shifted value is returned.\r | |
21 | \r | |
22 | This function shifts the 64-bit value Operand to the left by Count bits. The\r | |
23 | low Count bits are set to zero. The shifted value is returned.\r | |
24 | \r | |
25 | @param Operand The 64-bit operand to shift left.\r | |
26 | @param Count The number of bits to shift left.\r | |
27 | \r | |
28 | @return Operand << Count\r | |
29 | \r | |
30 | **/\r | |
e1f414b6 | 31 | UINT64\r |
32 | EFIAPI\r | |
33 | InternalMathLShiftU64 (\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 | xor eax, eax\r | |
41 | mov edx, dword ptr [Operand + 0]\r | |
42 | test cl, 32 // Count >= 32?\r | |
43 | cmovz eax, edx\r | |
44 | cmovz edx, dword ptr [Operand + 4]\r | |
45 | shld edx, eax, cl\r | |
46 | shl eax, cl\r | |
47 | }\r | |
48 | }\r | |
49 | \r |