• Yunqing Wang's avatar
    Add SSE2 subtract functions · 4db20765
    Yunqing Wang authored
    Instead of doing 8-bit data unpack and 16-bit subtraction, use
    psubb to do 16 8-bit subtractions and pcmpgtb to preserve the
    sign information. This does not bring noticable gain since
    these functions are not called frequently.
    
    Change-Id: I90a0dfaa3db9d422e4ada324076596ffb178548e
    4db20765