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/*
* Binary Search with multiple tasklets
*
*/
#include <stdint.h>
#include <stdio.h>
#include <defs.h>
#include <mram.h>
#include <alloc.h>
#include <mram.h>
#include <barrier.h>
#include <perfcounter.h>
#include "common.h"
#define WORD_MASK 0xfffffff8
__host dpu_arguments_t DPU_INPUT_ARGUMENTS;
__host dpu_results_t DPU_RESULTS[NR_TASKLETS];
// Search
static DTYPE search(DTYPE *bufferA, DTYPE searching_for, size_t search_size) {
DTYPE found = -2;
if(bufferA[0] <= searching_for)
{
found = -1;
for (uint32_t i = 0; i < search_size / sizeof(DTYPE); i++){
if(bufferA[i] == searching_for)
{
found = i;
break;
}
}
}
return found;
}
BARRIER_INIT(my_barrier, NR_TASKLETS);
extern int main_kernel1(void);
int(*kernels[nr_kernels])(void) = {main_kernel1};
int main(void){
// Kernel
return kernels[DPU_INPUT_ARGUMENTS.kernel]();
}
// main_kernel1
int main_kernel1() {
unsigned int tasklet_id = me();
#if PRINT
printf("tasklet_id = %u\n", tasklet_id);
#endif
if(tasklet_id == 0){
mem_reset(); // Reset the heap
}
// Barrier
barrier_wait(&my_barrier);
DTYPE searching_for, found;
uint64_t input_size = DPU_INPUT_ARGUMENTS.input_size;
// Address of the current processing block in MRAM
uint32_t start_mram_block_addr_A = (uint32_t) DPU_MRAM_HEAP_POINTER;
uint32_t start_mram_block_addr_aux = start_mram_block_addr_A;
uint32_t end_mram_block_addr_A = start_mram_block_addr_A + sizeof(DTYPE) * input_size;
uint32_t current_mram_block_addr_query = end_mram_block_addr_A + tasklet_id * (DPU_INPUT_ARGUMENTS.slice_per_dpu / NR_TASKLETS) * sizeof(DTYPE);
// Initialize a local cache to store the MRAM block
DTYPE *cache_A = (DTYPE *) mem_alloc(BLOCK_SIZE);
DTYPE *cache_aux_A = (DTYPE *) mem_alloc(BLOCK_SIZE);
DTYPE *cache_aux_B = (DTYPE *) mem_alloc(BLOCK_SIZE);
dpu_results_t *result = &DPU_RESULTS[tasklet_id];
for(uint64_t targets = 0; targets < (DPU_INPUT_ARGUMENTS.slice_per_dpu / NR_TASKLETS); targets++)
{
found = -1;
mram_read((__mram_ptr void const *) current_mram_block_addr_query, &searching_for, 8);
current_mram_block_addr_query += 8;
bool end = false;
// Initialize input vector boundaries
start_mram_block_addr_A = (uint32_t) DPU_MRAM_HEAP_POINTER;
start_mram_block_addr_aux = start_mram_block_addr_A;
end_mram_block_addr_A = start_mram_block_addr_A + sizeof(DTYPE) * input_size;
uint32_t current_mram_block_addr_A = start_mram_block_addr_A;
// Bring first and last values to WRAM
mram_read((__mram_ptr void const *) current_mram_block_addr_A, cache_aux_A, BLOCK_SIZE);
mram_read((__mram_ptr void const *) (end_mram_block_addr_A - BLOCK_SIZE * sizeof(DTYPE)), cache_aux_B, BLOCK_SIZE);
while(1)
{
// Locate the address of the mid mram block
current_mram_block_addr_A = (start_mram_block_addr_A + end_mram_block_addr_A) / 2;
current_mram_block_addr_A &= WORD_MASK;
// Boundary check
if(current_mram_block_addr_A < (start_mram_block_addr_A + BLOCK_SIZE))
{
//end = true;
// find (start_mram_block_addr_A, start_mram_block_addr_A + BLOCK_SIZE)
mram_read((__mram_ptr void const *) start_mram_block_addr_A, cache_A, BLOCK_SIZE);
found = search(cache_A, searching_for, BLOCK_SIZE);
if(found > -1)
{
result->found = found + (start_mram_block_addr_A - start_mram_block_addr_aux) / sizeof(DTYPE);
printf("Tasklet %d has found %lld\n", me(), result->found + 1);
}
// find (start_mram_block_addr_A + BLOCK_SIZE, end_mram_block_addr_A)
else
{
size_t remain_bytes_to_search = end_mram_block_addr_A - (start_mram_block_addr_A + BLOCK_SIZE);
mram_read((__mram_ptr void const *) start_mram_block_addr_A + BLOCK_SIZE, cache_A, remain_bytes_to_search);
found = search(cache_A, searching_for, remain_bytes_to_search);
if(found > -1)
{
result->found = found + (start_mram_block_addr_A + BLOCK_SIZE - start_mram_block_addr_aux) / sizeof(DTYPE);
printf("Tasklet %d has found %lld\n", me(), result->found + 1);
}
else
{
printf("%lld NOT found\n", searching_for);
}
}
break;
}
// Load cache with current MRAM block
mram_read((__mram_ptr void const *) current_mram_block_addr_A, cache_A, BLOCK_SIZE);
// Search inside block
found = search(cache_A, searching_for, BLOCK_SIZE);
// If found > -1, we found the searching_for query
if(found > -1)
{
result->found = found + (current_mram_block_addr_A - start_mram_block_addr_aux) / sizeof(DTYPE);
printf("Tasklet %d has found %lld\n", me(), result->found + 1);
break;
}
// If found == -2, we need to discard right part of the input vector
if(found == -2)
{
end_mram_block_addr_A = current_mram_block_addr_A;
}
// If found == -1, we need to discard left part of the input vector
else if (found == -1)
{
start_mram_block_addr_A = current_mram_block_addr_A;
}
}
}
return 0;
}
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