Loop Rewind - Multiple Loops - 2020.1 English

Description

This message is to inform the user that the code is violating loop rewind optimization rules

Explanation

Loop rewind optimization requires the function to have at most a single loop. The below code shows the violation:

decoderInput_whileloop:while(1)
        {
    #pragma HLS PIPELINE II=1 rewind
            if(!inputStream.empty())
            {
                ...
            else
            {
                ...
                break;
            }
        }
        for(auto i=0;i<50;i++)
        {
            tempData.even = i*2;
            tempData.odd = i*2+1;
            pairedData.write(tempData);
        }

Solution

Loop Rewind optimization will only apply when there is a single loop inside teh function. Move the loops into each separate function to perform loop rewind optimization.