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opus: slight speedup of deemphasis

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Hoist load of coefficients out of the loop.

Speeds up decoding of a 64kbps test file by 0.6MHz on h300 (cf)
0.2MHz on c200 (pp) and 0.1MHz on fuzev1 (amsv1)

Signed-off-by: Nils Wallménius <nils@rockbox.org>

Change-Id: I4be0059fc2a77748575f5fc9378f7f348d64f1c4
This commit is contained in:
Andree Buschmann 2012-10-06 14:51:01 +02:00 • committed by Nils Wallménius
parent dceec09092
commit da67f66eed
1 changed files with 8 additions and 3 deletions
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11
lib/rbcodec/codecs/libopus/celt/celt.c
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@ -466,16 +466,21 @@ static void deemphasis(celt_sig *in[], opus_val16 *pcm, int N, int C, /* int dow
int j;
celt_sig * OPUS_RESTRICT x;
opus_val16 * OPUS_RESTRICT y;
opus_val16 coef0 = coef[0];
#ifdef CUSTOM_MODES
opus_val16 coef1 = coef[1];
opus_val16 coef3 = coef[3];
#endif
celt_sig m = mem[c];
x =in[c];
y = pcm+c;
for (j=0;j<N;j++)
{
celt_sig tmp = *x + m;
m = MULT16_32_Q15(coef[0], tmp);
m = MULT16_32_Q15(coef0, tmp);
#ifdef CUSTOM_MODES
m -= MULT16_32_Q15(coef[1], *x);
tmp = SHL32(MULT16_32_Q15(coef[3], tmp), 2);
m -= MULT16_32_Q15(coef1, *x);
tmp = SHL32(MULT16_32_Q15(coef3, tmp), 2);
#endif
x++;
/* Technically the store could be moved outside of the if because