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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] pkt_sched: gen_estimator: use 64 bits intermediate
 counters for bps
Date: Tue, 19 May 2009 01:18:38 -0700 (PDT)
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From: Eric Dumazet <dada1@cosmosbay.com>
Date: Tue, 19 May 2009 09:31:36 +0200

> Apparently gcc does the *right* thing on x86_32, but we probably
> want something stronger here. I could not find gcc documentation
> statement on right shifts of negative values.

It emits an "arithmetic shift right" for every CPU I've ever checked.