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| author | Jens Arnold <amiconn@rockbox.org> | 2009-06-07 21:27:05 +0000 |
|---|---|---|
| committer | Jens Arnold <amiconn@rockbox.org> | 2009-06-07 21:27:05 +0000 |
| commit | 1d6df54df27cb41c02226678a2c8f9feddd1a1e0 (patch) | |
| tree | 5fdc6dd98ac0208f5c3351b062063af6914cbefb /apps/plugins/lib/fixedpoint.c | |
| parent | c3182ec333982e961d3babfbdb1125fd5bac7fb8 (diff) | |
| download | rockbox-1d6df54df27cb41c02226678a2c8f9feddd1a1e0.zip rockbox-1d6df54df27cb41c02226678a2c8f9feddd1a1e0.tar.gz rockbox-1d6df54df27cb41c02226678a2c8f9feddd1a1e0.tar.bz2 rockbox-1d6df54df27cb41c02226678a2c8f9feddd1a1e0.tar.xz | |
Convert a number of places in core and plugins to use the BIT_N() macro instead of 1<<n. Speeds up things on SH1, and also reduces core binsize. Most notable speedups: 1 bit lcd driver: drawpixel +20%, drawline + 27%, hline +5%; jpeg viewer: +8% for 1/8 scaling. Other targets are unaffected.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21205 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/plugins/lib/fixedpoint.c')
| -rw-r--r-- | apps/plugins/lib/fixedpoint.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/apps/plugins/lib/fixedpoint.c b/apps/plugins/lib/fixedpoint.c index 7b9b68a..0ae2cde 100644 --- a/apps/plugins/lib/fixedpoint.c +++ b/apps/plugins/lib/fixedpoint.c @@ -22,6 +22,7 @@ ****************************************************************************/ #include <inttypes.h> +#include "plugin.h" #include "fixedpoint.h" /* Inverse gain of circular cordic rotation in s0.31 format. */ @@ -144,7 +145,7 @@ long fsincos(unsigned long phase, long *cos) */ long fsqrt(long a, unsigned int fracbits) { - long b = a/2 + (1 << fracbits); /* initial approximation */ + long b = a/2 + BIT_N(fracbits); /* initial approximation */ unsigned n; const unsigned iterations = 4; |