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unroll another common case in vorbis_residue_decode

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Originally committed as revision 14250 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Loren Merritt 17 years ago
parent 589790c294
commit 1a32536737
1 changed files with 8 additions and 0 deletions
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  1. 8
      libavcodec/vorbis_dec.c

8
libavcodec/vorbis_dec.c
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@ -1330,6 +1330,14 @@ static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fa
vec[voffs+k ]+=codebook.codevectors[coffs ]; // FPMATH vec[voffs+k ]+=codebook.codevectors[coffs ]; // FPMATH
vec[voffs+k+vlen]+=codebook.codevectors[coffs+1]; // FPMATH vec[voffs+k+vlen]+=codebook.codevectors[coffs+1]; // FPMATH
} }
} else if(dim==4) {
for(k=0;k<step;++k, voffs+=2) {
coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
vec[voffs ]+=codebook.codevectors[coffs ]; // FPMATH
vec[voffs+1 ]+=codebook.codevectors[coffs+2]; // FPMATH
vec[voffs+vlen ]+=codebook.codevectors[coffs+1]; // FPMATH
vec[voffs+vlen+1]+=codebook.codevectors[coffs+3]; // FPMATH
}
} else } else
for(k=0;k<step;++k) { for(k=0;k<step;++k) {
coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim; coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

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