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avcodec/apedec: Factor constant sign out of loop in long_filter_high_3800()

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930 -> 850 cycles

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2023-04-23 23:54:50 +02:00
parent eb768a75f8
commit b2a3279dbe
1 changed files with 14 additions and 3 deletions
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17
libavcodec/apedec.c
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@@ -955,9 +955,20 @@ static void long_filter_high_3800(int32_t *buffer, int order, int shift, int len
for (i = order; i < length; i++) {
dotprod = 0;
sign = APESIGN(buffer[i]);
for (j = 0; j < order; j++) {
dotprod += delayp[j] * (unsigned)coeffs[j];
coeffs[j] += ((delayp[j] >> 31) | 1) * sign;
if (sign == 1) {
for (j = 0; j < order; j++) {
dotprod += delayp[j] * (unsigned)coeffs[j];
coeffs[j] += (delayp[j] >> 31) | 1;
}
} else if (sign == -1) {
for (j = 0; j < order; j++) {
dotprod += delayp[j] * (unsigned)coeffs[j];
coeffs[j] -= (delayp[j] >> 31) | 1;
}
} else {
for (j = 0; j < order; j++) {
dotprod += delayp[j] * (unsigned)coeffs[j];
}
}
buffer[i] -= (unsigned)(dotprod >> shift);
delayp ++;