vector_mac.c

#BANKX
int filter[]  = {0, 0, 0, 1, 0, 0, 0};
#BANKY
int samples[] = {1, 2, 3, 4, 5, 6, 7};

CORCONbits.IFMODE = CORCON_IFMODE_INTEGER;

#ASM
mov filter,w8    // W8 and W9 can address X memory
mov samples,w10  // W10 and W11 can address Y memory

clr A,[w8]+=2,w4,[w10]+=2,w5
  // Clear Acc A, and by the way...
  // Move to W4 the value where W8 was pointing to
  // Add two to W8
  // Move to W5 the value where W10 was pointing to
  // Add two to W10

repeat #6  // loop 7 (6+1) times this:
mac w4*w5,a,[w8]+=2,w4,[w10]+=2,w5
  // Multiply W4 and W5, add the result to Acc A and btw...
  // Move to W4 the value where W8 was pointing to
  // Add two to W8
  // Move to W5 the value where W10 was pointing to
  // Add two to W10
#ENDASM