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optimisation: better indexing/looping in vq_index()

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This commit is contained in:
Jean-Marc Valin 2008-04-18 17:54:52 +10:00
parent f7cec83c59
commit 7adca0e64a
1 changed files with 8 additions and 8 deletions
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16
libcelt/quant_pitch.c
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@ -54,24 +54,24 @@
#define Q1515ONE MULT16_16(Q15ONE,Q15ONE)
/** Taken from Speex.Finds the index of the entry in a codebook that best matches the input*/
int vq_index(celt_pgain_t *in, const celt_uint16_t *codebook, int len, int entries)
int vq_index(const celt_pgain_t *in, const celt_uint16_t *codebook, int len, int entries)
{
int i,j;
int ind = 0;
celt_word32_t min_dist=0;
celt_word32_t min_dist=VERY_LARGE32;
int best_index=0;
for (i=0;i<entries;i++)
{
celt_word32_t dist=0;
for (j=0;j<len>>1;j++)
{
celt_pgain_t tmp1 = SHR16(SUB16(in[2*j],PGAIN_EVEN(codebook, ind)),1);
celt_pgain_t tmp2 = SHR16(SUB16(in[2*j+1],PGAIN_ODD(codebook, ind)),1);
const celt_pgain_t *inp = in;
j=0; do {
celt_pgain_t tmp1 = SHR16(SUB16(*inp++,PGAIN_EVEN(codebook, ind)),1);
celt_pgain_t tmp2 = SHR16(SUB16(*inp++,PGAIN_ODD(codebook, ind)),1);
ind++;
dist = MAC16_16(dist, tmp1, tmp1);
dist = MAC16_16(dist, tmp2, tmp2);
}
if (i==0 || dist<min_dist)
} while (++j<len>>1);
if (dist<min_dist)
{
min_dist=dist;
best_index=i;