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author | Loren Merritt <lorenm@u.washington.edu> | 2008-02-21 07:54:46 +0000 |
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committer | Loren Merritt <lorenm@u.washington.edu> | 2008-02-21 07:54:46 +0000 |
commit | 469bd7b150f1016d5335b846801898792502a817 (patch) | |
tree | 3330d3a96fa3711dffa39f90c9fdc850497e6fff /libavcodec/dsputil.c | |
parent | 4a9ca0a279375e8dae774deef0c22b437935db20 (diff) | |
download | ffmpeg-streaming-469bd7b150f1016d5335b846801898792502a817.zip ffmpeg-streaming-469bd7b150f1016d5335b846801898792502a817.tar.gz |
pseudo-simd add_bytes and diff_bytes
2x faster than scalar in 32bit, 4x faster in 64bit (as opposed to 8x in mmx)
Originally committed as revision 12165 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/dsputil.c')
-rw-r--r-- | libavcodec/dsputil.c | 33 |
1 files changed, 20 insertions, 13 deletions
diff --git a/libavcodec/dsputil.c b/libavcodec/dsputil.c index c9b02a0..6c0be5d 100644 --- a/libavcodec/dsputil.c +++ b/libavcodec/dsputil.c @@ -50,6 +50,9 @@ void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w uint8_t ff_cropTbl[256 + 2 * MAX_NEG_CROP] = {0, }; uint32_t ff_squareTbl[512] = {0, }; +static const unsigned long pb_7f = 0x7f7f7f7f7f7f7f7fUL; +static const unsigned long pb_80 = 0x8080808080808080UL; + const uint8_t ff_zigzag_direct[64] = { 0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, @@ -3276,34 +3279,31 @@ static void clear_blocks_c(DCTELEM *blocks) } static void add_bytes_c(uint8_t *dst, uint8_t *src, int w){ - int i; - for(i=0; i+7<w; i+=8){ - dst[i+0] += src[i+0]; - dst[i+1] += src[i+1]; - dst[i+2] += src[i+2]; - dst[i+3] += src[i+3]; - dst[i+4] += src[i+4]; - dst[i+5] += src[i+5]; - dst[i+6] += src[i+6]; - dst[i+7] += src[i+7]; + long i; + for(i=0; i<=w-sizeof(long); i+=sizeof(long)){ + long a = *(long*)(src+i); + long b = *(long*)(dst+i); + *(long*)(dst+i) = ((a&pb_7f) + (b&pb_7f)) ^ ((a^b)&pb_80); } for(; i<w; i++) dst[i+0] += src[i+0]; } static void add_bytes_l2_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w){ - int i; + long i; for(i=0; i<=w-sizeof(long); i+=sizeof(long)){ long a = *(long*)(src1+i); long b = *(long*)(src2+i); - *(long*)(dst+i) = ((a&0x7f7f7f7f7f7f7f7fL) + (b&0x7f7f7f7f7f7f7f7fL)) ^ ((a^b)&0x8080808080808080L); + *(long*)(dst+i) = ((a&pb_7f) + (b&pb_7f)) ^ ((a^b)&pb_80); } for(; i<w; i++) dst[i] = src1[i]+src2[i]; } static void diff_bytes_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w){ - int i; + long i; +#ifndef HAVE_FAST_UNALIGNED + if((long)src2 & (sizeof(long)-1)){ for(i=0; i+7<w; i+=8){ dst[i+0] = src1[i+0]-src2[i+0]; dst[i+1] = src1[i+1]-src2[i+1]; @@ -3314,6 +3314,13 @@ static void diff_bytes_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w){ dst[i+6] = src1[i+6]-src2[i+6]; dst[i+7] = src1[i+7]-src2[i+7]; } + }else +#endif + for(i=0; i<=w-sizeof(long); i+=sizeof(long)){ + long a = *(long*)(src1+i); + long b = *(long*)(src2+i); + *(long*)(dst+i) = ((a|pb_80) - (b&pb_7f)) ^ ((a^b^pb_80)&pb_80); + } for(; i<w; i++) dst[i+0] = src1[i+0]-src2[i+0]; } |