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| /** @file
| 64-bit right rotation for Ia32
|
| Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
| SPDX-License-Identifier: BSD-2-Clause-Patent
|
| **/
|
|
|
|
| /**
| Rotates a 64-bit integer right between 0 and 63 bits, filling
| the high bits with the high low bits that were rotated.
|
| This function rotates the 64-bit value Operand to the right by Count bits.
| The high Count bits are fill with the low Count bits of Operand. The rotated
| value is returned.
|
| @param Operand The 64-bit operand to rotate right.
| @param Count The number of bits to rotate right.
|
| @return Operand >>> Count
|
| **/
| UINT64
| EFIAPI
| InternalMathRRotU64 (
| IN UINT64 Operand,
| IN UINTN Count
| )
| {
| _asm {
| mov cl, byte ptr [Count]
| mov eax, dword ptr [Operand + 0]
| mov edx, dword ptr [Operand + 4]
| shrd ebx, eax, cl
| shrd eax, edx, cl
| rol ebx, cl
| shrd edx, ebx, cl
| test cl, 32 // Count >= 32?
| jz L0
| mov ecx, eax
| mov eax, edx
| mov edx, ecx
| L0:
| }
| }
|
|
|
