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lossless audio dsp: unroll

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The loops are guaranteed to be at least multiples of 8, so this
unrolling is safe but allows exploiting execution ports.

For int32 version: 68 -> 58c.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Christophe Gisquet
2016-05-01 15:33:47 +02:00
committed by Michael Niedermayer
parent bf29794022
commit 9ca16bdd3f
1 changed files with 8 additions and 4 deletions
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12
libavcodec/lossless_audiodsp.c
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@@ -29,10 +29,12 @@ static int32_t scalarproduct_and_madd_int16_c(int16_t *v1, const int16_t *v2,
{ {
int res = 0; int res = 0;
while (order--) { do {
res += *v1 * *v2++; res += *v1 * *v2++;
*v1++ += mul * *v3++; *v1++ += mul * *v3++;
} res += *v1 * *v2++;
*v1++ += mul * *v3++;
} while (order-=2);
return res; return res;
} }
@@ -42,10 +44,12 @@ static int32_t scalarproduct_and_madd_int32_c(int16_t *v1, const int32_t *v2,
{ {
int res = 0; int res = 0;
while (order--) { do {
res += *v1 * *v2++; res += *v1 * *v2++;
*v1++ += mul * *v3++; *v1++ += mul * *v3++;
} res += *v1 * *v2++;
*v1++ += mul * *v3++;
} while (order-=2);
return res; return res;
} }