/* This file performs the following test: start, read, stop and again functionality

   - It attempts to use the following three counters. It may use less depending on
     hardware counter resource limitations. These are counted in the default counting
     domain and default granularity, depending on the platform. Usually this is 
     the user domain (PAPI_DOM_USER) and thread context (PAPI_GRN_THR).
     + PAPI_FP_INS or PAPI_TOT_INS if PAPI_FP_INS doesn't exist
     + PAPI_TOT_CYC

     1
   - Start counters
   - Do flops
   - Stop counters

     2
   - Start counters
   - Do flops
   - Stop counters (should duplicate above)

     3
   - Reset counters (should be redundant if stop works properly)
   - Start counters
   - Do flops
   - Stop counters

     4
   - Start counters
   - Do flops/2
   - Read counters (flops/2;counters keep counting)

     5
   - Do flops/2
   - Read counters (2flops/2; counters keep counting)

     6
   - Do flops/2
   - Read counters (3*flops/2; counters keep counting)
   - Accum counters (2*(3*flops.2); counters clear and counting)

     7
   - Do flops/2
   - Read counters (flops/2; counters keep counting)

     8
   - Reset (counters set to zero; still counting)
   - Stop counters (flops/2; counters stopped)

     9
   - Reset (counters set to zero; still counting)
   - Do flops/2
   - Stop counters (flops/2; counters stopped)

     9
   - Reset (counters set to zero and stopped)
   - Read counters (should be zero)
*/

#include <stdio.h>

#include "papi.h"
#include "papi_test.h"

#include "do_loops.h"

int
main( int argc, char **argv )
{
	int retval, num_tests = 9, num_events, tmp, i;
	long long **values;
	int EventSet = PAPI_NULL;
	int PAPI_event, mask;
	char event_name[PAPI_MAX_STR_LEN], add_event_str[PAPI_MAX_STR_LEN];
	int quiet;

	/* Set TESTS_QUIET variable */
	quiet = tests_quiet( argc, argv );

	/* Init the PAPI library */
	retval = PAPI_library_init( PAPI_VER_CURRENT );
	if ( retval != PAPI_VER_CURRENT ) {
	   test_fail( __FILE__, __LINE__, "PAPI_library_init", retval );
	}

	/* add PAPI_TOT_CYC and one of the events in
	   PAPI_FP_INS, PAPI_FP_OPS or PAPI_TOT_INS,
	   depending on the availability of the event
	   on the platform */
	EventSet = add_two_events( &num_events, &PAPI_event, &mask );

	retval = PAPI_event_code_to_name( PAPI_event, event_name );
	if ( retval != PAPI_OK ) {
	   test_fail( __FILE__, __LINE__, "PAPI_event_code_to_name", retval );
	}
	sprintf( add_event_str, "PAPI_add_event[%s]", event_name );

	values = allocate_test_space( num_tests, num_events );

	/*===== Test 1: Start/Stop =======================*/

	retval = PAPI_start( EventSet );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_start", retval );
	}

	do_flops( NUM_FLOPS );

	retval = PAPI_stop( EventSet, values[0] );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_stop", retval );
	}

	/*===== Test 2 Start/Stop =======================*/

	retval = PAPI_start( EventSet );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_start", retval );
	}

	do_flops( NUM_FLOPS );

	retval = PAPI_stop( EventSet, values[1] );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_stop", retval );
	}

	/*===== Test 3: Reset/Start/Stop =======================*/

	retval = PAPI_reset( EventSet );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_reset", retval );
	}

	retval = PAPI_start( EventSet );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_start", retval );
	}

	do_flops( NUM_FLOPS );

	retval = PAPI_stop( EventSet, values[2] );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_stop", retval );
	}

	/*===== Test 4: Start/Read =======================*/

	retval = PAPI_start( EventSet );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_start", retval );
	}

	do_flops( NUM_FLOPS / 2 );

	retval = PAPI_read( EventSet, values[3] );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_read", retval );
	}

	/*===== Test 5: Read =======================*/

	do_flops( NUM_FLOPS / 2 );

	retval = PAPI_read( EventSet, values[4] );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_read", retval );
	}

	/*===== Test 6: Read/Accum =======================*/

	do_flops( NUM_FLOPS / 2 );

	retval = PAPI_read( EventSet, values[5] );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_read", retval );
	}

	retval = PAPI_accum( EventSet, values[5] );

	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_accum", retval );
	}

	/*===== Test 7: Read =======================*/

	do_flops( NUM_FLOPS / 2 );

	retval = PAPI_read( EventSet, values[6] );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_read", retval );
	}

	/*===== Test 8 Reset/Stop =======================*/
	retval = PAPI_reset( EventSet );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_reset", retval );
	}

	do_flops( NUM_FLOPS / 2 );

	retval = PAPI_stop( EventSet, values[7] );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_stop", retval );
	}

	/*===== Test 9: Reset/Read =======================*/
	retval = PAPI_reset( EventSet );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_reset", retval );
	}

	retval = PAPI_read( EventSet, values[8] );
	if ( retval != PAPI_OK ) {
		test_fail( __FILE__, __LINE__, "PAPI_read", retval );
	}

	remove_test_events( &EventSet, mask );

	if (!quiet) {
		printf( "Test case: Start/Stop/Read/Accum/Reset.\n" );
		printf( "----------------------------------------------------------------\n" );
		tmp = PAPI_get_opt( PAPI_DEFDOM, NULL );
		printf( "Default domain is: %d (%s)\n", tmp,
			stringify_all_domains( tmp ) );
		tmp = PAPI_get_opt( PAPI_DEFGRN, NULL );
		printf( "Default granularity is: %d (%s)\n", tmp,
			stringify_granularity( tmp ) );
		printf( "Using %d iterations of c += a*b\n", NUM_FLOPS );
		printf( "-------------------------------------------------------------------------\n" );

		sprintf( add_event_str, "%s:", event_name );
		printf( "                           PAPI_TOT_CYC    %s\n", event_name );
		printf( "1. start,ops,stop          %10lld      %10lld\n", values[0][0],
			values[0][1] );
		printf( "2. start,ops,stop          %10lld      %10lld\n", values[1][0],
			values[1][1] );
		printf( "3. reset,start,ops,stop    %10lld      %10lld\n", values[2][0],
			values[2][1] );
		printf( "4. start,ops/2,read        %10lld      %10lld\n", values[3][0],
			values[3][1] );
		printf( "5. ops/2,read              %10lld      %10lld\n", values[4][0],
			values[4][1] );
		printf( "6. ops/2,accum             %10lld      %10lld\n", values[5][0],
			values[5][1] );
		printf( "7. ops/2,read              %10lld      %10lld\n", values[6][0],
			values[6][1] );
		printf( "8. reset,ops/2,stop        %10lld      %10lld\n", values[7][0],
			values[7][1] );
		printf( "9. reset,read              %10lld      %10lld\n", values[8][0],
			values[8][1] );
		printf( "-------------------------------------------------------------------------\n" );
		printf( "Verification:\n" );
		printf( "Row 1 approximately equals rows 2 and 3 \n" );
		printf( "Row 4 approximately equals 1/2 of row 3\n" );
		printf( "Row 5 approximately equals twice row 4\n" );
		printf( "Row 6 approximately equals 6 times row 4\n" );
		printf( "Rows 7 and 8 approximately equal row 4\n" );
		printf( "Row 9 equals 0\n" );
		printf( "%% difference between %s 1 & 2: %.2f\n", "PAPI_TOT_CYC",
			100.0 * ( float ) values[0][0] / ( float ) values[1][0] );
		printf( "%% difference between %s 1 & 2: %.2f\n", add_event_str,
			100.0 * ( float ) values[0][1] / ( float ) values[1][1] );
	}

	for ( i = 0; i <= 1; i++ ) {
		if ( !approx_equals
			 ( ( double ) values[0][i], ( double ) values[1][i] ) )
			test_fail( __FILE__, __LINE__,
					   ( ( i == 0 ) ? "PAPI_TOT_CYC" : add_event_str ), 1 );
		if ( !approx_equals
			 ( ( double ) values[1][i], ( double ) values[2][i] ) )
			test_fail( __FILE__, __LINE__,
					   ( ( i == 0 ) ? "PAPI_TOT_CYC" : add_event_str ), 1 );
		if ( !approx_equals
			 ( ( double ) values[2][i], ( double ) values[3][i] * 2.0 ) )
			test_fail( __FILE__, __LINE__,
					   ( ( i == 0 ) ? "PAPI_TOT_CYC" : add_event_str ), 1 );
		if ( !approx_equals
			 ( ( double ) values[2][i], ( double ) values[4][i] ) )
			test_fail( __FILE__, __LINE__,
					   ( ( i == 0 ) ? "PAPI_TOT_CYC" : add_event_str ), 1 );
		if ( !approx_equals
			 ( ( double ) values[5][i], ( double ) values[3][i] * 6.0 ) )
			test_fail( __FILE__, __LINE__,
					   ( ( i == 0 ) ? "PAPI_TOT_CYC" : add_event_str ), 1 );
		if ( !approx_equals
			 ( ( double ) values[6][i], ( double ) values[3][i] ) )
			test_fail( __FILE__, __LINE__,
					   ( ( i == 0 ) ? "PAPI_TOT_CYC" : add_event_str ), 1 );
		if ( !approx_equals
			 ( ( double ) values[7][i], ( double ) values[3][i] ) )
			test_fail( __FILE__, __LINE__,
					   ( ( i == 0 ) ? "PAPI_TOT_CYC" : add_event_str ), 1 );
		if ( values[8][i] != 0LL )
			test_fail( __FILE__, __LINE__,
					   ( ( i == 0 ) ? "PAPI_TOT_CYC" : add_event_str ), 1 );
	}

	test_pass( __FILE__ );

	return 0;
}
