David Howells wrote: > Geert Uytterhoeven <[EMAIL PROTECTED]> wrote: > >> Hence shouldn't we ask the gcc people what's the purpose of >> __builtin_expect(), if it doesn't live up to its promise? > > __builtin_expect() is useful on FRV where you _have_ to give each branch and > conditional branch instruction a measure of probability whether the branch > will be taken. > > David
I was wondering whether some of the uses of likely illustrated below are incorrect or not useful. x = likely(X) || Y for ( ... ; likely(...); ... ) while ( likely(X) ) if ( unlikely(X) &&/|| likely(Y) ) if ( X &&/|| unlikely(Y) ) return likely(X); return likely(X) ? a : b; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
