On Mon, Feb 03, 2003 at 04:46:28PM +0200, Gilad Benjamini wrote: > AFAIK, embedded assembly code (__asm) can not be optimized by the > compiler. It can't be optimised away, but register and memory usage can be optimised. > I heard through the grapevine that you can embed a single assembly > instruction, > using a "__" prefix, and in this case the compiler CAN optimize. The > code. > Is this correct ? No. > What's the exact syntax ? __asm__ ( "asm code" : "input variables" : "output variables" : "clobber" ); > Where is this documented ? The gcc info pages (try tkinfo or pinfo, they're better info readers than info). Also be sure to check the links section on kernelnewbies.org, we have a couple of links to inline assembly. BIG FAT WARNING: Try to avoid assembly! It makes your code non-portable and hard to maintain! Erik -- J.A.K. (Erik) Mouw Email: J.A.K.Mouw@its.tudelft.nl mouw@nl.linux.org WWW: http://www-ict.its.tudelft.nl/~erik/
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