• Christophe Gisquet's avatar
    rv40: x86 SIMD for biweight · e5c9de2a
    Christophe Gisquet authored
    
    
    Provide MMX, SSE2 and SSSE3 versions, with a fast-path when the weights are
    multiples of 512 (which is often the case when the values round up nicely).
    
    *_TIMER report for the 16x16 and 8x8 cases:
    C:
    9015 decicycles in 16, 524257 runs, 31 skips
    2656 decicycles in 8, 524271 runs, 17 skips
    MMX:
    4156 decicycles in 16, 262090 runs, 54 skips
    1206 decicycles in 8, 262131 runs, 13 skips
    MMX on fast-path:
    2760 decicycles in 16, 524222 runs, 66 skips
    995 decicycles in 8, 524252 runs, 36 skips
    SSE2:
    2163 decicycles in 16, 262131 runs, 13 skips
    832 decicycles in 8, 262137 runs, 7 skips
    SSE2 with fast path:
    1783 decicycles in 16, 524276 runs, 12 skips
    711 decicycles in 8, 524283 runs, 5 skips
    SSSE3:
    2117 decicycles in 16, 262136 runs, 8 skips
    814 decicycles in 8, 262143 runs, 1 skips
    SSSE3 with fast path:
    1315 decicycles in 16, 524285 runs, 3 skips
    578 decicycles in 8, 524286 runs, 2 skips
    
    This means around a 4% speedup for some sequences.
    Signed-off-by: default avatarDiego Biurrun <diego@biurrun.de>
    e5c9de2a
Makefile 4.11 KB