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| /** @file
| 64-bit Math Worker Function.
| The 32-bit versions of C compiler generate calls to library routines
| to handle 64-bit math. These functions use non-standard calling conventions.
|
| Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
| SPDX-License-Identifier: BSD-2-Clause-Patent
|
| **/
|
|
| /*
| * Shifts a 64-bit signed value left by a particular number of bits.
| */
| __declspec(naked) void __cdecl _allshl (void)
| {
| _asm {
| ;
| ; Handle shifting of 64 or more bits (return 0)
| ;
| cmp cl, 64
| jae short ReturnZero
|
| ;
| ; Handle shifting of between 0 and 31 bits
| ;
| cmp cl, 32
| jae short More32
| shld edx, eax, cl
| shl eax, cl
| ret
|
| ;
| ; Handle shifting of between 32 and 63 bits
| ;
| More32:
| mov edx, eax
| xor eax, eax
| and cl, 31
| shl edx, cl
| ret
|
| ReturnZero:
| xor eax,eax
| xor edx,edx
| ret
| }
| }
|
|
