From 9ca16bdd3f0461b40d369080647747ae70715daf Mon Sep 17 00:00:00 2001 From: Christophe Gisquet Date: Sun, 1 May 2016 15:33:47 +0200 Subject: [PATCH] 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 --- libavcodec/lossless_audiodsp.c | 12 ++++++++---- 1 file 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; }