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.

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

--yoshfuji
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