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42 lines
1.0 KiB
C
42 lines
1.0 KiB
C
/** @file
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Calculate the product of a 64-bit integer and a 32-bit integer
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Copyright (c) 2006 - 2008, 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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Multiples a 64-bit unsigned integer by a 32-bit unsigned integer
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and generates a 64-bit unsigned result.
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This function multiples the 64-bit unsigned value Multiplicand by the 32-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 32-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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InternalMathMultU64x32 (
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IN UINT64 Multiplicand,
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IN UINT32 Multiplier
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)
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{
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_asm {
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mov ecx, Multiplier
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mov eax, ecx
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imul ecx, dword ptr [Multiplicand + 4] // overflow not detectable
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mul dword ptr [Multiplicand + 0]
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add edx, ecx
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}
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}
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