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P_ONE_LOOP(8, {
pd = 0;
ps1 = ~ps1;
if (!ps1) pd = 8;
else {
if ((ps1 & 0xF0) == 0) { pd += 4; ps1 <<= 4; }
if ((ps1 & 0xC0) == 0) { pd += 2; ps1 <<= 2; }
if ((ps1 & 0x80) == 0) { pd += 1; }
}
})
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