len0rd/rockbox
1
0
Fork 1
mirror of https://github.com/Rockbox/rockbox.git synced 2025-12-09 13:15:18 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

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.

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19556 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2008-12-22 08:33:49 +00:00
parent 1124713acb
commit ed945e31c1
1 changed files with 2 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

4
apps/codecs/demac/libdemac/filter.c
View file

@ -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;