eden-emu/opus
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Use more MAC16_16's and unroll a loop.

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This splits out the non-arch-specific portions of a patch written
 by Aurélien Zanelli <aurelien.zanelli@parrot.com
 http://lists.xiph.org/pipermail/opus/2013-May/002088.html

I also added support for odd n, for custom modes.

0.25% speedup on 96 kbps stereo encode+decode on a Cortex A8.
This commit is contained in:
Timothy B. Terriberry 2013-05-22 15:26:12 -07:00
parent 2040606f4a
commit 85ede2c6aa
1 changed files with 10 additions and 5 deletions
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15
celt/celt_lpc.c
View file

@ -101,7 +101,7 @@ void celt_fir(const opus_val16 *x,
opus_val32 sum = SHL32(EXTEND32(x[i]), SIG_SHIFT);
for (j=0;j<ord;j++)
{
sum += MULT16_16(num[j],mem[j]);
sum = MAC16_16(sum,num[j],mem[j]);
}
for (j=ord-1;j>=1;j--)
{
@ -161,11 +161,16 @@ void _celt_autocorr(
}
#ifdef FIXED_POINT
{
opus_val32 ac0=0;
opus_val32 ac0;
int shift;
for(i=0;i<n;i++)
int n2;
ac0 = 1+n;
if (n&1) ac0 += SHR32(MULT16_16(xx[0],xx[0]),9);
for(i=(n&1);i<n;i+=2)
{
ac0 += SHR32(MULT16_16(xx[i],xx[i]),9);
ac0 += 1+n;
ac0 += SHR32(MULT16_16(xx[i+1],xx[i+1]),9);
}
shift = celt_ilog2(ac0)-30+10;
shift = (shift+1)/2;
@ -176,7 +181,7 @@ void _celt_autocorr(
while (lag>=0)
{
for (i = lag, d = 0; i < n; i++)
d += xx[i] * xx[i-lag];
d = MAC16_16(d, xx[i], xx[i-lag]);
ac[lag] = d;
/*printf ("%f ", ac[lag]);*/
lag--;