From: Jeff Garzik <[EMAIL PROTECTED]> Date: Fri, 21 Dec 2007 06:26:48 -0500
> YOSHIFUJI Hideaki / 吉藤英明 wrote: > > In article <[EMAIL PROTECTED]> (at Fri, 21 Dec 2007 07:03:58 +0100), Eric > > Dumazet <[EMAIL PROTECTED]> says: > > > >> Because tot_len is signed in tcp_v6_send_ack(), tot_len/4 forces compiler > >> to emit an integer divide, while we can help it to use a right shift, > >> less expensive. > > > > Are you really sure? > > At least, gcc-4.1.2-20061115 (debian) does not make any difference. > > Quite true -- thus it is a matter of taste to the programmer. Not true, the code output does change, check your optimize-for-size kernel config setting. This was discussed and explained later in this thread, and I also explained it to you on IRC Jeff ;-) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
