3.6.3.21 SHLS-40

Message

Warning: (SHLS-40) Argument '{argument|argument_index}' in '{function}' is not read or written, or has been assigned but never been used. This is not allowed in the dataflow subfunction. Please restructure your code to fix this.

/*****************************************************************
 *  This example is expected to result in
 *  - Code  : SHLS-40
 *  - Type  : Warning
 *  - Cause : Unused argument 'out2' in dataflow subfunction subf()
 *****************************************************************/    
#define NELEM 10

void subf(int in[NELEM], int out1[NELEM], int out2[NELEM]) {
#pragma HLS loop pipeline
    for (int i = 0; i < NELEM; i++) {
        out1[i] = in[i] + 1;
    }
}

void DUT(int in[NELEM], int out[NELEM]) {
#pragma HLS function top dataflow
     int tmp[NELEM];
     subf(in, tmp, out);
}

Related to: Data Flow Parallelism