(3) Q1. Consider the code of the FIR filter given below. What is the limitation...
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(3) Q1. Consider the code of the FIR filter given below. What is the limitation in fully unrolling the Shift_Accum_Loop and how can we overcome this limitation? void fir( data_t *y, coef_t c[4], data_t x) { static data_t shift_reg[4]; acc_t acc; data_t data; int i; acc=0; Shift_Accum_Loop: for (i=3;i>=0;i--) { if (i==0) { shift_reg[0]=x; data = x; } else { shift_reg[i]=shift_reg[i-1]; data = shift_reg[i]; } acc+=data* c[i]; } *y=acc; } (3) Q1. Consider the code of the FIR filter given below. What is the limitation in fully unrolling the Shift_Accum_Loop and how can we overcome this limitation? void fir( data_t *y, coef_t c[4], data_t x) { static data_t shift_reg[4]; acc_t acc; data_t data; int i; acc=0; Shift_Accum_Loop: for (i=3;i>=0;i--) { if (i==0) { shift_reg[0]=x; data = x; } else { shift_reg[i]=shift_reg[i-1]; data = shift_reg[i]; } acc+=data* c[i]; } *y=acc; }
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