psad1 Operation Font Conventions
if (PR[qp]) {
check_target_register;

x[0] = GR[r2]{7:0}; y[0] = GR[r3]{7:0};
x[1] = GR[r2]{15:8}; y[1] = GR[r3]{15:8};
x[2] = GR[r2]{23:16}; y[2] = GR[r3]{23:16};
x[3] = GR[r2]{31:24}; y[3] = GR[r3]{31:24};
x[4] = GR[r2]{39:32}; y[4] = GR[r3]{39:32};
x[5] = GR[r2]{47:40}; y[5] = GR[r3]{47:40};
x[6] = GR[r2]{55:48}; y[6] = GR[r3]{55:48};
x[7] = GR[r2]{63:56}; y[7] = GR[r3]{63:56};

GR[r1] = 0;
for (i = 0; i < 8; i++) {
temp[i] = zero_ext(x[i], 8) - zero_ext(y[i], 8);
if (temp[i] < 0)
temp[i] = -temp[i];
GR[r1] += temp[i];
}

GR[r1].nat = GR[r2].nat || GR[r3].nat;
}