Dear All : this question suppose not posted in the mailing list,since I have been posted it on GNU compiler mailing list , and get no reponse. I posted it here to get your help . We licence MIPS CPU without MAC (the module support multiplication and division functions). For the convenience sake , we use ( *, / ) instead of (+ ,-) in the c programs. in the gcc man document , this kind of function is not menstioned. Does anyone meet the same question , and know how to solve it ? - 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/