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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Fri, 19 Nov 2010 17:55:59 +0100

> Unfortunatly on x86_32 it also chose that f_k was more valuable in a cpu
> register and accumulator A lost its register to get a stack slot
> instead.

Ok that tradeoff is terrible, but it depends upon knowledge we haven't
given to the compiler (yet).

Let me think about this a bit...