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Add ASM optimised range_limit() for ARM, which gives a tiny performance

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gain. Removed a couple of tabs.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8740 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thom Johansen 2006-02-19 18:57:46 +00:00
parent f285f60936
commit 6e3ad7eead
1 changed files with 12 additions and 2 deletions
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10
apps/plugins/jpeg.c
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@ -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;