mulhigh.c

来自「不错的东西 请查看 WINCE OS」· C语言 代码 · 共 26 行

//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
//
// This source code is licensed under Microsoft Shared Source License
// Version 1.0 for Windows CE.
// For a copy of the license visit http://go.microsoft.com/fwlink/?LinkId=3223.
//
#include <corecrt.h>
#include <limits.h>
#include <cmnintrin.h>

#pragma warning(disable:4163)
#pragma function (_MulHigh)

//
// _MulHigh
//
long _MulHigh( long x, long y )
{
	__int64 x64 = x;
    __int64 y64 = y;

    return (long)((x64 * y64) >> (sizeof(long) * CHAR_BIT));
}