xref: /src/sys/external/bsd/gnu-efi/dist/lib/ia64/math.c

/*	$NetBSD: math.c,v 1.1.1.1.6.2 2014/05/22 11:40:58 yamt Exp $	*/

/*++

Copyright (c) 1998  Intel Corporation

Module Name:

    math.c

Abstract:




Revision History

--*/

#include "lib.h"


//
// Declare runtime functions
//

#ifdef RUNTIME_CODE
#ifndef __GNUC__
#pragma RUNTIME_CODE(LShiftU64)
#pragma RUNTIME_CODE(RShiftU64)
#pragma RUNTIME_CODE(MultU64x32)
#pragma RUNTIME_CODE(DivU64x32)
#endif
#endif

//
//
//




UINT64
LShiftU64 (
    IN UINT64   Operand,
    IN UINTN    Count
    )
// Left shift 64bit by 32bit and get a 64bit result
{
    return Operand << Count;
}

UINT64
RShiftU64 (
    IN UINT64   Operand,
    IN UINTN    Count
    )
// Right shift 64bit by 32bit and get a 64bit result
{
    return Operand >> Count;
}


UINT64
MultU64x32 (
    IN UINT64   Multiplicand,
    IN UINTN    Multiplier
    )
// Multiple 64bit by 32bit and get a 64bit result
{
    return Multiplicand * Multiplier;
}

UINT64
DivU64x32 (
    IN UINT64   Dividend,
    IN UINTN    Divisor,
    OUT UINTN   *Remainder OPTIONAL
    )
// divide 64bit by 32bit and get a 64bit result
// N.B. only works for 31bit divisors!!
{
    ASSERT (Divisor != 0);

    if (Remainder) {
        *Remainder = Dividend % Divisor;
    }

    return Dividend / Divisor;
}