lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Fri, 21 Dec 2007 15:50:30 +0900 (JST)
From:	YOSHIFUJI Hideaki / 吉藤英明 
Subject: Re: [TCP] IPV6 : Change a divide into a right shift in

In article <> (at Fri, 21 Dec 2007 07:03:58 +0100), Eric Dumazet <> 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.

And, IMHO, because shift for signed variable is fragile, so we should
avoid using it.

To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists