armippp_power_s64.c

来自「The OpenMAX DL (Development Layer) APIs 」· C语言 代码 · 共 48 行

/**
 *
 * 
 * File Name:  armIPPP_Power_S64.c
 * OpenMAX DL: v1.0.2
 * Revision:   10586
 * Date:       Wednesday, March 5, 2008
 * 
 * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
 * 
 * 
 *
 * Description  : Computes one term to the power of the other.
 *
 */

#include "omxtypes.h"
#include "armIP.h"

/**
 * Function: armIPPP_Power_S64
 *
 * Description:
 * Computes "base" to the power of "power". This function uses the C library
 * apart from the case of 0 to the power 0 which we must ensure is returned as 1
 *
 * Return Value:
 * OMX_S64 -- The result of "base" raised to "power"
 */
 
OMX_S64 armIPPP_Power_S64(
        OMX_S32 base,
        OMX_S32 power
       )
{
    /* Although we must ensure that 0 to the power 0 is returned as 1,  it   */
    /* requires less code just to say anything that is to the power 0 is 1.  */
    if (power==0)
    {
        return 1;
    }
        
    return armRoundFloatToS64(pow(base, power));
}

/* End of file */