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move some stuff out of an inner loop. 12% faster svq1 encoding.
Originally committed as revision 8560 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -992,17 +992,16 @@ static int encode_block(SVQ1Context *s, uint8_t *src, uint8_t *ref, uint8_t *dec
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for(i=0; i<16; i++){
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int sum= codebook_sum[stage*16 + i];
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int sqr, diff, mean, score;
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int sqr, diff, score;
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vector = codebook + stage*size*16 + i*size;
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sqr = s->dsp.ssd_int8_vs_int16(vector, block[stage], size);
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diff= block_sum[stage] - sum;
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mean= (diff + (size>>1)) >> (level+3);
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assert(mean >-300 && mean<300);
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if(intra) mean= av_clip(mean, 0, 255);
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else mean= av_clip(mean, -256, 255);
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score= sqr - ((diff*(int64_t)diff)>>(level+3)); //FIXME 64bit slooow
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if(score < best_vector_score){
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int mean= (diff + (size>>1)) >> (level+3);
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assert(mean >-300 && mean<300);
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mean= av_clip(mean, intra?0:-256, 255);
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best_vector_score= score;
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best_vector[stage]= i;
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best_vector_sum= sum;
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