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| author | Thom Johansen <thomj@rockbox.org> | 2006-02-19 18:57:46 +0000 |
|---|---|---|
| committer | Thom Johansen <thomj@rockbox.org> | 2006-02-19 18:57:46 +0000 |
| commit | 6e3ad7eead0ed91e83aebb474ed4463d79583fd5 (patch) | |
| tree | b2bc8768efbfe4914c917b814de1add336e629ff | |
| parent | f285f60936797a5ad7b63ae37a8f0a7dd3a453f0 (diff) | |
| download | rockbox-6e3ad7eead0ed91e83aebb474ed4463d79583fd5.tar.gz rockbox-6e3ad7eead0ed91e83aebb474ed4463d79583fd5.zip | |
Add ASM optimised range_limit() for ARM, which gives a tiny performance
gain. Removed a couple of tabs.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8740 a1c6a512-1295-4272-9138-f99709370657
| -rw-r--r-- | apps/plugins/jpeg.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/apps/plugins/jpeg.c b/apps/plugins/jpeg.c index 4a20da1a55..d574bdada8 100644 --- a/apps/plugins/jpeg.c +++ b/apps/plugins/jpeg.c @@ -172,6 +172,16 @@ INLINE unsigned range_limit(int value) [v]"+r"(value) ); return value; +#elif defined(CPU_ARM) + asm ( + "adds %[v], %[v], #128\n" /* value += 128 */ + "movmi %[v], #0 \n" /* clip to 0 if negative result */ + "cmp %[v], #255 \n" /* did we exceed 255? */ + "movgt %[v], #255 \n" /* yes, clip to limit */ + : + [v]"+r"(value) + ); + return value; #else value += 128; @@ -2062,8 +2072,8 @@ int scroll_bmp(struct t_disp* pdisp) switch(button) { case JPEG_LEFT: - if (!(ds < ds_max) && entries > 0 && jpg.x_size <= MAX_X_SIZE) - return change_filename(DIR_PREV); + if (!(ds < ds_max) && entries > 0 && jpg.x_size <= MAX_X_SIZE) + return change_filename(DIR_PREV); case JPEG_LEFT | BUTTON_REPEAT: move = MIN(HSCROLL, pdisp->x); if (move > 0) |