Description
Warning: [HLS 214-349] Cannot apply performance
pragma target_ti=5 cycles for loop 'VITIS_LOOP_11_1' in function 'top'. The target
requires a pipeline II less than the minimal achievable II of 6 determined by the
number of conflicting accesses on local memory 'b_buf' (6 per iteration)
(test.cpp:12:9).
Explanation
There are too many accesses to the specified local memory and this prevents an II=1 from being achieved. Consider reducing the number of accesses to the memory in one cycle or increasing the number of memory ports or consider partitioning the array to allow more parallel access.
//////////// ORIGINAL ////////////
void top(int a[1000],
int b[10000]) {
int j;
int b_buf[10000];
#pragma hls bind_storage variable=b_buf type=RAM_1P impl=bram
int a_buf[1000];
memcpy(b_buf, b, sizeof(b_buf));
for (j = 0; j < 100; j++) {
#pragma HLS performance target_ti=5
a_buf[j] = b_buf[j] + b_buf[2 *j] + b_buf[3 *j] + b_buf[4 *j] + b_buf[5 *j] + b_buf[6 *j];
}
memcpy(a, a_buf, sizeof(a_buf));
}