From: Charles Forsyth <forsyth@terzarima.net>
To: 9fans@9fans.net
Subject: Re: [9fans] What's so special about seek() ?
Date: Mon, 20 Oct 2008 22:11:22 +0100 [thread overview]
Message-ID: <244fbb7370d6d3e7069c3e06c1116877@terzarima.net> (raw)
In-Reply-To: <20081020072645.GJ4216@masters10.cs.jhu.edu>
>Forgive my ignorance, but I don't see how the code in question relates to
>returning a 64-bit value?
MOVL a+0(FP),CX
MOVL AX,0(CX)
MOVL AX,4(CX)
that's how a 64-bit value is returned on 32-bit machines:
similar to returning a structure, the caller passes a
hidden first argument referring to the 64-bit return location.
in this case, since -1 is already in AX, storing that in both 32-bit
parts of the 64-bit value produces -1LL
next prev parent reply other threads:[~2008-10-20 21:11 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-20 7:26 Nathaniel W Filardo
2008-10-20 8:19 ` C H Forsyth
2008-10-20 20:30 ` Nathaniel W Filardo
2008-10-20 20:50 ` Steve Simon
2008-10-20 21:11 ` Charles Forsyth [this message]
2008-10-20 21:03 ` Nathaniel W Filardo
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