From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Mon, 28 Jan 2013 23:50:51 +0000
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From: Charles Forsyth <charles.forsyth@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] fp crash
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On 28 January 2013 23:37, erik quanstrom <quanstro@quanstro.net> wrote:
> is the compiler free to assume that
> d2 has not been modified?

It's free to do it, but whether it ought to is another matter.
Your specific example has appeared once before, but I can't remember
the context and resolution
(it might have turned up in Inferno).

uvlong won't be stored in register(s) in your version of 5c, so it
won't behave the same way.