mirror of https://github.com/acidanthera/audk.git
34 lines
984 B
C
34 lines
984 B
C
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/** @file
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64-bit left shift function for IA-32.
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Copyright (c) 2006 - 2007, Intel Corporation<BR>
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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UINT64
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EFIAPI
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InternalMathLShiftU64 (
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IN UINT64 Operand,
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IN UINTN Count
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)
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{
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_asm {
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mov cl, byte ptr [Count]
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xor eax, eax
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mov edx, dword ptr [Operand + 0]
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test cl, 32 // Count >= 32?
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cmovz eax, edx
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cmovz edx, dword ptr [Operand + 4]
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shld edx, eax, cl
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shl eax, cl
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}
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}
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