papi_br_cn.c

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/* This file attempts to test the conditional branch instructions   */
/* performance counter PAPI_BR_CN                   */
 
/* by Vince Weaver, <vincent.weaver@maine.edu>              */
 
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
 
#include "papi.h"
#include "papi_test.h"
 
#include "display_error.h"
#include "testcode.h"
 
 
int main(int argc, char **argv) {
 
    int num_runs=100,i;
    long long high=0,low=0,average=0,expected=1000000;
    double error;
 
    long long count,total=0;
    int quiet=0,retval,ins_result;
    int eventset=PAPI_NULL;
 
    quiet=tests_quiet(argc,argv);
 
    if (!quiet) {
        printf("\nTesting the PAPI_BR_CN event.\n");
    }
 
    /* Init the PAPI library */
    retval = PAPI_library_init( PAPI_VER_CURRENT );
    if ( retval != PAPI_VER_CURRENT ) {
        test_fail( __FILE__, __LINE__, "PAPI_library_init", retval );
    }
 
    retval=PAPI_create_eventset(&eventset);
    if (retval!=PAPI_OK) {
        test_fail( __FILE__, __LINE__, "PAPI_create_eventset", retval );
    }
 
    retval=PAPI_add_named_event(eventset,"PAPI_BR_CN");
    if (retval!=PAPI_OK) {
        test_skip( __FILE__, __LINE__, "adding PAPI_BR_CN", retval );
    }
 
    if (!quiet) {
        printf("Testing a loop with %lld conditional branches (%d times):\n",
            expected,num_runs);
    }
 
    for(i=0;i<num_runs;i++) {
        PAPI_reset(eventset);
        PAPI_start(eventset);
 
        ins_result=branches_testcode();
 
        retval=PAPI_stop(eventset,&count);
 
        if (ins_result==CODE_UNIMPLEMENTED) {
            fprintf(stderr,"\tCode unimplemented\n");
            test_skip( __FILE__, __LINE__, "unimplemented", 0);
        }
 
        if (retval!=PAPI_OK) {
            test_fail( __FILE__, __LINE__,
                "reading PAPI_TOT_INS", retval );
        }
 
        if (count>high) high=count;
        if ((low==0) || (count<low)) low=count;
        total+=count;
    }
 
    average=(total/num_runs);
 
    error=display_error(average,high,low,expected,quiet);
 
    if ((error > 1.0) || (error<-1.0)) {
        if (!quiet) printf("Instruction count off by more than 1%%\n");
        test_fail( __FILE__, __LINE__, "Error too high", 1 );
    }
 
    if (!quiet) printf("\n");
 
    test_pass( __FILE__ );
 
    PAPI_shutdown();
 
    return 0;
}