diff options
author | Christophe Gisquet <christophe.gisquet@gmail.com> | 2016-05-01 15:33:47 +0200 |
---|---|---|
committer | Michael Niedermayer <michael@niedermayer.cc> | 2016-05-11 21:03:07 +0200 |
commit | 9ca16bdd3f0461b40d369080647747ae70715daf (patch) | |
tree | ebd5e6e8acaa786ab01e3883fdf7838c66695a1e | |
parent | bf29794022db597f526a8575648244a7c6ee15ed (diff) |
lossless audio dsp: unroll
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>
-rw-r--r-- | libavcodec/lossless_audiodsp.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/libavcodec/lossless_audiodsp.c b/libavcodec/lossless_audiodsp.c index ea0568e64f..e3ea8e188c 100644 --- a/libavcodec/lossless_audiodsp.c +++ b/libavcodec/lossless_audiodsp.c @@ -29,10 +29,12 @@ static int32_t scalarproduct_and_madd_int16_c(int16_t *v1, const int16_t *v2, { int res = 0; - while (order--) { + do { res += *v1 * *v2++; *v1++ += mul * *v3++; - } + res += *v1 * *v2++; + *v1++ += mul * *v3++; + } while (order-=2); return res; } @@ -42,10 +44,12 @@ static int32_t scalarproduct_and_madd_int32_c(int16_t *v1, const int32_t *v2, { int res = 0; - while (order--) { + do { + res += *v1 * *v2++; + *v1++ += mul * *v3++; res += *v1 * *v2++; *v1++ += mul * *v3++; - } + } while (order-=2); return res; } |