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avcodec/apedec: Move pointer instead of copying each element in delay in long_filter_high_3800()

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~1000 -> 930 cycles

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-04-23 23:51:38 +02:00
parent b614388056
commit eb768a75f8
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GPG Key ID: B18E8928B3948D64
1 changed files with 9 additions and 6 deletions
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15
libavcodec/apedec.c
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@ -944,7 +944,7 @@ static void long_filter_high_3800(int32_t *buffer, int order, int shift, int len
{
int i, j;
int32_t dotprod, sign;
int32_t coeffs[256], delay[256];
int32_t coeffs[256], delay[256+256], *delayp = delay;
if (order >= length)
return;
@ -956,13 +956,16 @@ static void long_filter_high_3800(int32_t *buffer, int order, int shift, int len
dotprod = 0;
sign = APESIGN(buffer[i]);
for (j = 0; j < order; j++) {
dotprod += delay[j] * (unsigned)coeffs[j];
coeffs[j] += ((delay[j] >> 31) | 1) * sign;
dotprod += delayp[j] * (unsigned)coeffs[j];
coeffs[j] += ((delayp[j] >> 31) | 1) * sign;
}
buffer[i] -= (unsigned)(dotprod >> shift);
for (j = 0; j < order - 1; j++)
delay[j] = delay[j + 1];
delay[order - 1] = buffer[i];
delayp ++;
delayp[order - 1] = buffer[i];
if (delayp - delay == 256) {
memcpy(delay, delayp, sizeof(*delay)*256);
delayp = delay;
}
}
}