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97f98500 HT |
1 | /** @file\r |
2 | 64-bit Math Worker Function.\r | |
3 | The 32-bit versions of C compiler generate calls to library routines\r | |
4 | to handle 64-bit math. These functions use non-standard calling conventions.\r | |
5 | \r | |
2ac68e8b | 6 | Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>\r |
2009f6b4 | 7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
97f98500 HT |
8 | \r |
9 | **/\r | |
10 | \r | |
97f98500 HT |
11 | /*\r |
12 | * Shifts a 64-bit signed value left by a particular number of bits.\r | |
13 | */\r | |
7c342378 MK |
14 | __declspec(naked) void __cdecl\r |
15 | _allshl (\r | |
16 | void\r | |
17 | )\r | |
97f98500 HT |
18 | {\r |
19 | _asm {\r | |
20 | ;\r | |
21 | ; Handle shifting of 64 or more bits (return 0)\r | |
22 | ;\r | |
7c342378 | 23 | \r |
97f98500 HT |
24 | cmp cl, 64\r |
25 | jae short ReturnZero\r | |
26 | \r | |
27 | ;\r | |
28 | ; Handle shifting of between 0 and 31 bits\r | |
29 | ;\r | |
2ac68e8b | 30 | cmp cl, 32\r |
97f98500 HT |
31 | jae short More32\r |
32 | shld edx, eax, cl\r | |
33 | shl eax, cl\r | |
34 | ret\r | |
35 | \r | |
36 | ;\r | |
37 | ; Handle shifting of between 32 and 63 bits\r | |
38 | ;\r | |
39 | More32:\r | |
40 | mov edx, eax\r | |
41 | xor eax, eax\r | |
42 | and cl, 31\r | |
43 | shl edx, cl\r | |
44 | ret\r | |
45 | \r | |
46 | ReturnZero:\r | |
47 | xor eax,eax\r | |
48 | xor edx,edx\r | |
49 | ret\r | |
50 | }\r | |
51 | }\r |