Intel® Integrated Performance Primitives (Intel® IPP) Developer Guide and Reference

ID 790148
Date 10/31/2024
Public
Document Table of Contents

SwapBytes

Reverses the byte order of a vector.

Syntax

IppStatus ippsSwapBytes_16u(const Ipp16u* pSrc, Ipp16u* pDst, int len);

IppStatus ippsSwapBytes_24u(const Ipp8u* pSrc, Ipp8u* pDst, int len);

IppStatus ippsSwapBytes_32u(const Ipp32u* pSrc, Ipp32u* pDst, int len);

IppStatus ippsSwapBytes_64u(const Ipp64u* pSrc, Ipp64u* pDst, int len);

IppStatus ippsSwapBytes_16u_I(Ipp16u* pSrcDst, int len);

IppStatus ippsSwapBytes_24u_I(Ipp8u* pSrcDst, int len);

IppStatus ippsSwapBytes_32u_I(Ipp32u* pSrcDst, int len);

IppStatus ippsSwapBytes_64u_I(Ipp64u* pSrcDst, int len);

Include Files

ipps.h

Domain Dependencies

Headers: ippcore.h, ippvm.h

Libraries: ippcore.lib, ippvm.lib

Parameters

pSrc

Pointer to the source vector.

pDst

Pointer to the destination vector.

pSrcDst

Pointer to the source and destination vector for the in-place operation.

len

Number of elements in the vector.

Description

This function reverses the endian order (byte order) of the source vector pSrc (pSrcDst for the in-place operation) and stores the result in pDst (pSrcDst). When the low-order byte is stored in memory at the lowest address, and the high-order byte at the highest address, the little-endian order is implemented.When the high-order byte is stored in memory at the lowest address, and the low-order byte at the highest address, the big-endian order is implemented. The function ippsSwapBytes allows to switch from one order to the other in either direction.

Return Values

ippStsNoErr

Indicates no error.

ippStsNullPtrErr

Indicates an error when any of the specified pointers is NULL.

ippStsSizeErr

Indicates an error when len is less than or equal to zero.

Example

/*******************************************************************************
* Copyright 2015 Intel Corporation.
*
*
* This software and the related documents are Intel copyrighted materials, and your use of them is governed by
* the express license under which they were provided to you ('License'). Unless the License provides otherwise,
* you may not use, modify, copy, publish, distribute, disclose or transmit this software or the related
* documents without Intel's prior written permission.
* This software and the related documents are provided as is, with no express or implied warranties, other than
* those that are expressly stated in the License.
*******************************************************************************/

#include <stdio.h>
#include "ipp.h"

/* Next two defines are created to simplify code reading and understanding */
#define EXIT_MAIN exitLine:                                  /* Label for Exit */
#define check_sts(st) if((st) != ippStsNoErr) goto exitLine; /* Go to Exit if Intel(R) Integrated Performance Primitives (Intel(R) IPP) function returned status different from ippStsNoErr */

/* Results of ippMalloc() are not validated because Intel(R) IPP functions perform bad arguments check and will return an appropriate status  */

int main()
{
    Ipp16u vec[2] = { 0x1234, 0x5678 };
    IppStatus status;

    printf("Source vector %X %X\n", vec[0], vec[1]);
    check_sts(status = ippsSwapBytes_16u_I(vec, 2));
    printf("After swap \nResult vector %X %X\n", vec[0], vec[1]);

EXIT_MAIN
    printf("\nExit status %d (%s)\n", (int)status, ippGetStatusString(status));
    return (int)status;
}