1 /** @file 2 64-bit left rotation for Ia32 3 4 Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php. 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 **/ 14 15 16 17 18 /** 19 Rotates a 64-bit integer left between 0 and 63 bits, filling 20 the low bits with the high bits that were rotated. 21 22 This function rotates the 64-bit value Operand to the left by Count bits. The 23 low Count bits are fill with the high Count bits of Operand. The rotated 24 value is returned. 25 26 @param Operand The 64-bit operand to rotate left. 27 @param Count The number of bits to rotate left. 28 29 @return Operand <<< Count 30 31 **/ 32 UINT64 33 EFIAPI 34 InternalMathLRotU64 ( 35 IN UINT64 Operand, 36 IN UINTN Count 37 ) 38 { 39 _asm { 40 mov cl, byte ptr [Count] 41 mov edx, dword ptr [Operand + 4] 42 mov eax, dword ptr [Operand + 0] 43 shld ebx, edx, cl 44 shld edx, eax, cl 45 ror ebx, cl 46 shld eax, ebx, cl 47 test cl, 32 ; Count >= 32? 48 jz L0 49 mov ecx, eax 50 mov eax, edx 51 mov edx, ecx 52 L0: 53 } 54 } 55 56
