• Martin Storsjö's avatar
    aarch64: vp9itxfm16: Do a simpler half/quarter idct16/idct32 when possible · 61b8a9ea
    Martin Storsjö authored
    This work is sponsored by, and copyright, Google.
    
    This avoids loading and calculating coefficients that we know will
    be zero, and avoids filling the temp buffer with zeros in places
    where we know the second pass won't read.
    
    This gives a pretty substantial speedup for the smaller subpartitions.
    
    The code size increases from 21512 bytes to 31400 bytes.
    
    The idct16/32_end macros are moved above the individual functions; the
    instructions themselves are unchanged, but since new functions are added
    at the same place where the code is moved from, the diff looks rather
    messy.
    
    Before:
    vp9_inv_dct_dct_16x16_sub1_add_10_neon:     284.6
    vp9_inv_dct_dct_16x16_sub2_add_10_neon:    1902.7
    vp9_inv_dct_dct_16x16_sub4_add_10_neon:    1903.0
    vp9_inv_dct_dct_16x16_sub8_add_10_neon:    2201.1
    vp9_inv_dct_dct_16x16_sub12_add_10_neon:   2510.0
    vp9_inv_dct_dct_16x16_sub16_add_10_neon:   2821.3
    vp9_inv_dct_dct_32x32_sub1_add_10_neon:    1011.6
    vp9_inv_dct_dct_32x32_sub2_add_10_neon:    9716.5
    vp9_inv_dct_dct_32x32_sub4_add_10_neon:    9704.9
    vp9_inv_dct_dct_32x32_sub8_add_10_neon:   10641.7
    vp9_inv_dct_dct_32x32_sub12_add_10_neon:  11555.7
    vp9_inv_dct_dct_32x32_sub16_add_10_neon:  12499.8
    vp9_inv_dct_dct_32x32_sub20_add_10_neon:  13403.7
    vp9_inv_dct_dct_32x32_sub24_add_10_neon:  14335.8
    vp9_inv_dct_dct_32x32_sub28_add_10_neon:  15253.6
    vp9_inv_dct_dct_32x32_sub32_add_10_neon:  16179.5
    
    After:
    vp9_inv_dct_dct_16x16_sub1_add_10_neon:     282.8
    vp9_inv_dct_dct_16x16_sub2_add_10_neon:    1142.4
    vp9_inv_dct_dct_16x16_sub4_add_10_neon:    1139.0
    vp9_inv_dct_dct_16x16_sub8_add_10_neon:    1772.9
    vp9_inv_dct_dct_16x16_sub12_add_10_neon:   2515.2
    vp9_inv_dct_dct_16x16_sub16_add_10_neon:   2823.5
    vp9_inv_dct_dct_32x32_sub1_add_10_neon:    1012.7
    vp9_inv_dct_dct_32x32_sub2_add_10_neon:    6944.4
    vp9_inv_dct_dct_32x32_sub4_add_10_neon:    6944.2
    vp9_inv_dct_dct_32x32_sub8_add_10_neon:    7609.8
    vp9_inv_dct_dct_32x32_sub12_add_10_neon:   9953.4
    vp9_inv_dct_dct_32x32_sub16_add_10_neon:  10770.1
    vp9_inv_dct_dct_32x32_sub20_add_10_neon:  13418.8
    vp9_inv_dct_dct_32x32_sub24_add_10_neon:  14330.7
    vp9_inv_dct_dct_32x32_sub28_add_10_neon:  15257.1
    vp9_inv_dct_dct_32x32_sub32_add_10_neon:  16190.6
    Signed-off-by: 's avatarMartin Storsjö <martin@martin.st>
    61b8a9ea
vp9itxfm_16bpp_neon.S 79.6 KB