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

ID 790148
Date 3/22/2024
Public

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Document Table of Contents

GetL2CacheSize

Retrieves L2 cache size, in bytes.

Syntax

IppStatus ippGetL2CacheSize(int* pSize);

Include Files

ippcore.h

Parameters

pSize

Pointer to an integer number to store the cache size.

Description

The ippGetL2CacheSize function retrieves L2 cache size for the CPU on which it is executed. This function is based on function #4 of the CPUID instruction, and therefore works only for the CPUs that support this function. For old and non-Intel CPUs that do not support this CPUID extension, the function returns the ippStsCpuNotSupportedErr status. It means that L2 cache size cannot be obtained with the ippGetL2CacheSize function and you should use other methods based on a particular CPU specification.

Product and Performance Information

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.

Notice revision #20201201

Return Values

ippStsNoErr

Indicates no error.

ippStsNullPtrErr

Indicates an error condition when the pSize pointer is NULL.

ippStsNotSupportedCpu

Indicates that the processor is not supported.

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"

static char* cacheType[] = {
    "Data Cache",
    "Instruction Cache",
    "Unified Cache"
};

int main(){
    IppCache* pCacheInfo;
    int i;
    IppStatus sts;

    sts = ippGetCacheParams( &pCacheInfo );
    if( sts != ippStsNoErr ){
        printf("Intel(R) Integrated Performance Primitives (Intel(R) IPP) function returned error %s\n", ippGetStatusString( sts ));
        return 0;
    }
    i = 0;
    do{
        printf("cache type  = %s\n", cacheType[pCacheInfo[i].type-1] );
        printf("cache level = %d\n", pCacheInfo[i].level );
        printf("cache size  = %d\n", pCacheInfo[i].size );
        printf("+--------------------------------------+\n" );
    } while( pCacheInfo[++i].type > 0 );

    sts = ippGetL2CacheSize( &i );
    printf("\nCache L2 size = %d\n", i );

    return 0;
}