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Optimize biquad() to reduce dependency chains

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This commit is contained in:
Jean-Marc Valin 2023-11-24 18:02:35 -05:00
parent 176507e4fc
commit ddbdbec444
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GPG key ID: 531A52533318F00A
1 changed files with 15 additions and 4 deletions
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19
dnn/lpcnet_enc.c
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@ -83,14 +83,25 @@ static void frame_analysis(LPCNetEncState *st, kiss_fft_cpx *X, float *Ex, const
static void biquad(float *y, float mem[2], const float *x, const float *b, const float *a, int N) {
int i;
float mem0, mem1;
mem0 = mem[0];
mem1 = mem[1];
for (i=0;i<N;i++) {
float xi, yi;
float xi, yi, mem00;
xi = x[i];
yi = x[i] + mem[0];
mem[0] = mem[1] + (b[0]*xi - a[0]*yi);
mem[1] = (b[1]*xi - a[1]*yi);
yi = x[i] + mem0;
mem00 = mem0;
/* Original code:
mem0 = mem1 + (b[0]*xi - a[0]*yi);
mem1 = (b[1]*xi - a[1]*yi);
Modified to reduce dependency chains:
*/
mem0 = (b[0]-a[0])*xi + mem1 - a[0]*mem0;
mem1 = (b[1]-a[1])*xi + 1e-30f - a[1]*mem00;
y[i] = yi;
}
mem[0] = mem0;
mem[1] = mem1;
}
#define celt_log10(x) (0.3010299957f*celt_log2(x))