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46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
/** @file
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Calculate the product of a 64-bit integer and another 64-bit integer
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Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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/**
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Multiplies a 64-bit unsigned integer by a 64-bit unsigned integer
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and generates a 64-bit unsigned result.
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This function multiplies the 64-bit unsigned value Multiplicand by the 64-bit
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unsigned value Multiplier and generates a 64-bit unsigned result. This 64-
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bit unsigned result is returned.
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@param Multiplicand A 64-bit unsigned value.
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@param Multiplier A 64-bit unsigned value.
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@return Multiplicand * Multiplier
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**/
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UINT64
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EFIAPI
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InternalMathMultU64x64 (
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IN UINT64 Multiplicand,
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IN UINT64 Multiplier
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)
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{
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_asm {
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mov ebx, dword ptr [Multiplicand + 0]
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mov edx, dword ptr [Multiplier + 0]
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mov ecx, ebx
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mov eax, edx
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imul ebx, dword ptr [Multiplier + 4]
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imul edx, dword ptr [Multiplicand + 4]
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add ebx, edx
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mul ecx
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add edx, ebx
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}
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}
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