From ed945e31c1d522d5d3c4998781e476d95a8170e9 Mon Sep 17 00:00:00 2001 From: Jens Arnold Date: Mon, 22 Dec 2008 08:33:49 +0000 Subject: Slight speedup for the APE filters. Most noticeable on coldfire (+3.5% for -c2000), but also helps on the arm targets (+0.9% for -c2000 on PP5002). This transformation is oveflow safe, as absres < 2^24 is guaranteed. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19556 a1c6a512-1295-4272-9138-f99709370657 --- apps/codecs/demac/libdemac/filter.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'apps/codecs') diff --git a/apps/codecs/demac/libdemac/filter.c b/apps/codecs/demac/libdemac/filter.c index df17d35..bab830a 100644 --- a/apps/codecs/demac/libdemac/filter.c +++ b/apps/codecs/demac/libdemac/filter.c @@ -138,9 +138,9 @@ static void ICODE_ATTR_DEMAC do_apply_filter_3980(struct filter_t* f, /* Update the adaption coefficients */ absres = (res < 0 ? -res : res); - if (UNLIKELY(absres > (f->avg * 3))) + if (UNLIKELY(absres > 3 * f->avg)) *f->adaptcoeffs = ((res >> 25) & 64) - 32; - else if (absres > (f->avg * 4) / 3) + else if (3 * absres > 4 * f->avg) *f->adaptcoeffs = ((res >> 26) & 32) - 16; else if (LIKELY(absres > 0)) *f->adaptcoeffs = ((res >> 27) & 16) - 8; -- cgit v1.1