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Altera_Forum's avatar
Altera_Forum
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8 years ago

how to share DSP correctly ?

16bit or 8bit multiply should only use 0.5 DSP. I have try to implement two char type MAC, and the result will be store into int type. The DSP usage should be 64x16/2=1024/2=512 and in repo...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

Thanks HRZ

Did you mean I have to change code like this ?

and do you know why report.html tells that my DSP usage is 512 when I use 64x16 unroll MAC ?

__kernel

__attribute__((task))

void mul(){# pragma unroll

for(int i=0 ; i<64 ; i++){

# pragma unroll

for(int j=0 ; j<8; j++){

partial_sum += (short) ((w_in[j] * d_in[j]) + (w_in[j+8] * d_in[j+8]));

}

}