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//**************************************************************************
// Vector-vector add benchmark
//--------------------------------------------------------------------------
// Author : Andrew Waterman
// TA : Christopher Celio
// Student :
//
// This benchmark adds two vectors and writes the results to a
// third vector. The input data (and reference data) should be
// generated using the vvadd_gendata.pl perl script and dumped
// to a file named dataset.h
// to print out arrays, etc.
//#define DEBUG
//--------------------------------------------------------------------------
// Includes
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
//--------------------------------------------------------------------------
// Input/Reference Data
typedef float data_t;
#include "dataset.h"
//--------------------------------------------------------------------------
// Basic Utilities and Multi-thread Support
__thread unsigned long coreid;
unsigned long ncores;
#include "util.h"
#define stringify_1(s) #s
#define stringify(s) stringify_1(s)
#define stats(code) do { \
unsigned long _c = -rdcycle(), _i = -rdinstret(); \
code; \
_c += rdcycle(), _i += rdinstret(); \
if (coreid == 0) \
printf("%s: %ld cycles, %ld.%ld cycles/iter, %ld.%ld CPI\n", \
stringify(code), _c, _c/DATA_SIZE, 10*_c/DATA_SIZE%10, _c/_i, 10*_c/_i%10); \
} while(0)
//--------------------------------------------------------------------------
// Helper functions
void printArray( char name[], int n, data_t arr[] )
{
int i;
if (coreid != 0)
return;
printf( " %10s :", name );
for ( i = 0; i < n; i++ )
printf( " %4ld ", (long) arr[i] );
printf( "\n" );
}
void __attribute__((noinline)) verify(size_t n, const data_t* test, const data_t* correct)
{
if (coreid != 0)
return;
size_t i;
for (i = 0; i < n; i++)
{
if (test[i] != correct[i])
{
printf("FAILED test[%d]= %4ld, correct[%d]= %4ld\n",
i, (long) test[i], i, (long)correct[i]);
exit(-1);
}
}
return;
}
//--------------------------------------------------------------------------
// vvadd function
//perform in-place vvadd
void __attribute__((noinline)) vvadd(size_t n, data_t* __restrict__ x, const data_t* __restrict__ y)
{
size_t i;
// interleave accesses
for (i = coreid; i < n; i+=ncores)
{
x[i] = x[i] + y[i];
}
}
void __attribute__((noinline)) vvadd_opt(size_t n, data_t* __restrict__ x, const data_t* __restrict__ y)
{
// ***************************** //
// **** ADD YOUR CODE HERE ***** //
// ***************************** //
size_t i;
if (coreid == 0) {
for (i = 0; i < n/2; i++)
{
x[i] = x[i] + y[i];
}
} else if (coreid == 1) {
for (i = n/2; i < n; i++)
{
x[i] = x[i] + y[i];
}
}
}
//--------------------------------------------------------------------------
// Main
//
// all threads start executing thread_entry(). Use their "coreid" to
// differentiate between threads (each thread is running on a separate core).
void thread_entry(int cid, int nc)
{
coreid = cid;
ncores = nc;
// static allocates data in the binary, which is visible to both threads
static data_t results_data[DATA_SIZE];
// because we're going to perform an in-place vvadd (and we're going to run
// it a couple of times) let's copy the input data to a temporary results
// array
size_t i;
if (coreid == 0)
{
for (i = 0; i < DATA_SIZE; i++)
results_data[i] = input1_data[i];
}
// Execute the provided, terrible vvadd
barrier();
stats(vvadd(DATA_SIZE, results_data, input2_data); barrier());
// verify
verify(DATA_SIZE, results_data, verify_data);
// reset results from the first trial
if (coreid == 0)
{
for (i=0; i < DATA_SIZE; i++)
results_data[i] = input1_data[i];
}
barrier();
// Execute your faster vvadd
barrier();
stats(vvadd_opt(DATA_SIZE, results_data, input2_data); barrier());
#ifdef DEBUG
printArray("results: ", DATA_SIZE, results_data);
printArray("verify : ", DATA_SIZE, verify_data);
#endif
// verify
verify(DATA_SIZE, results_data, verify_data);
barrier();
exit(0);
}
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