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| author | Nils Wallménius <nils@rockbox.org> | 2010-07-27 06:30:38 +0000 |
|---|---|---|
| committer | Nils Wallménius <nils@rockbox.org> | 2010-07-27 06:30:38 +0000 |
| commit | ac16071399bcf8cef7c438416163b59374b78b6f (patch) | |
| tree | 0dfc997e8ad947acfd975aab52e5373376199dd2 | |
| parent | 30d286d859aad049fb549f48080a196f6074a9fa (diff) | |
| download | rockbox-ac16071399bcf8cef7c438416163b59374b78b6f.tar.gz rockbox-ac16071399bcf8cef7c438416163b59374b78b6f.zip | |
libwmapro: tiny tweak fo coldfire fixmul24 for a very slight speedup.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27585 a1c6a512-1295-4272-9138-f99709370657
| -rw-r--r-- | apps/codecs/libwmapro/wmapro_math.h | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/apps/codecs/libwmapro/wmapro_math.h b/apps/codecs/libwmapro/wmapro_math.h index 5220560998..ba6421c9f5 100644 --- a/apps/codecs/libwmapro/wmapro_math.h +++ b/apps/codecs/libwmapro/wmapro_math.h | |||
| @@ -111,18 +111,16 @@ | |||
| 111 | /* Calculates: result = (X*Y)>>24 */ | 111 | /* Calculates: result = (X*Y)>>24 */ |
| 112 | #define fixmul24(X,Y) \ | 112 | #define fixmul24(X,Y) \ |
| 113 | ({ \ | 113 | ({ \ |
| 114 | int32_t t, x = (X); \ | 114 | int32_t t1, t2; \ |
| 115 | asm volatile ( \ | 115 | asm volatile ( \ |
| 116 | "mac.l %[x],%[y],%%acc0\n\t" /* multiply */ \ | 116 | "mac.l %[x],%[y],%%acc0 \n\t" /* multiply */ \ |
| 117 | "mulu.l %[y],%[x] \n\t" /* get lower half, avoid emac stall */ \ | 117 | "move.l %%accext01, %[t1]\n\t" /* get lower 8 bits */ \ |
| 118 | "moveq.l #24,%[t] \n\t" \ | 118 | "movclr.l %%acc0,%[t2] \n\t" /* get higher 24 bits */ \ |
| 119 | "lsr.l %[t],%[x] \n\t" /* (unsigned)lo >>= 24 */ \ | 119 | "asl.l #7,%[t2] \n\t" /* hi <<= 7, plus one free */ \ |
| 120 | "movclr.l %%acc0,%[t] \n\t" /* get higher half */ \ | 120 | "move.b %[t1],%[t2] \n\t" /* combine result */ \ |
| 121 | "asl.l #7,%[t] \n\t" /* hi <<= 7, plus one free */ \ | 121 | : [t1]"=&d"(t1), [t2]"=&d"(t2) \ |
| 122 | "or.l %[x],%[t] \n\t" /* combine result */ \ | 122 | : [x] "d" ((X)), [y] "d" ((Y))); \ |
| 123 | : [t]"=&d"(t), [x] "+d" (x) \ | 123 | t2; \ |
| 124 | : [y] "d" ((Y))); \ | ||
| 125 | t; \ | ||
| 126 | }) | 124 | }) |
| 127 | 125 | ||
| 128 | /* Calculates: result = (X*Y)>>32 */ | 126 | /* Calculates: result = (X*Y)>>32 */ |