1 /** @file 2 64-bit Math Worker Function. 3 The 32-bit versions of C compiler generate calls to library routines 4 to handle 64-bit math. These functions use non-standard calling conventions. 5 6 Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR> 7 This program and the accompanying materials are licensed and made available 8 under the terms and conditions of the BSD License which accompanies this 9 distribution. The full text of the license may be found at 10 http://opensource.org/licenses/bsd-license.php. 11 12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 14 15 **/ 16 17 18 /* 19 * Shifts a 64-bit signed value left by a particular number of bits. 20 */ 21 __declspec(naked) void __cdecl _allshl (void) 22 { 23 _asm { 24 ; 25 ; Handle shifting of 64 or more bits (return 0) 26 ; 27 cmp cl, 64 28 jae short ReturnZero 29 30 ; 31 ; Handle shifting of between 0 and 31 bits 32 ; 33 cmp cl, 32 34 jae short More32 35 shld edx, eax, cl 36 shl eax, cl 37 ret 38 39 ; 40 ; Handle shifting of between 32 and 63 bits 41 ; 42 More32: 43 mov edx, eax 44 xor eax, eax 45 and cl, 31 46 shl edx, cl 47 ret 48 49 ReturnZero: 50 xor eax,eax 51 xor edx,edx 52 ret 53 } 54 } 55
