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| /** @file
| 64-bit left shift function for IA-32.
|
| Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
| SPDX-License-Identifier: BSD-2-Clause-Patent
|
| **/
|
|
|
|
| /**
| Shifts a 64-bit integer left between 0 and 63 bits. The low bits
| are filled with zeros. The shifted value is returned.
|
| This function shifts the 64-bit value Operand to the left by Count bits. The
| low Count bits are set to zero. The shifted value is returned.
|
| @param Operand The 64-bit operand to shift left.
| @param Count The number of bits to shift left.
|
| @return Operand << Count
|
| **/
| UINT64
| EFIAPI
| InternalMathLShiftU64 (
| IN UINT64 Operand,
| IN UINTN Count
| )
| {
| _asm {
| mov cl, byte ptr [Count]
| xor eax, eax
| mov edx, dword ptr [Operand + 0]
| test cl, 32 // Count >= 32?
| jnz L0
| mov eax, edx
| mov edx, dword ptr [Operand + 4]
| L0:
| shld edx, eax, cl
| shl eax, cl
| }
| }
|
|
|
