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From: Julian Seward <jseward@acm.org>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Emulation differences, qemu-system-x86_64 vs Athlon64
Date: Thu, 13 Apr 2006 00:15:27 +0100	[thread overview]
Message-ID: <200604130015.27832.jseward@acm.org> (raw)
In-Reply-To: <443D7C9D.8010401@bellard.org>


> I guess the problem comes from the usage of lrintl() on x86_64 in
> fpu/softfloat-native.c, but I cannot test it yet.

It might be that you have to pass in an extra value into those
float -> int conversion routines, which describes what to do if the
conversion is going to overflow.  That's because the behaviour is
different depending on the guest architecture.  x86/amd64 always
give 0x8000...., whereas ppc gives either 0x8000... or 0x7FFF....
depending on the sign of the argument (IIRC).

J

      reply	other threads:[~2006-04-12 23:15 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-04-12 12:08 [Qemu-devel] Emulation differences, qemu-system-x86_64 vs Athlon64 Julian Seward
2006-04-12 22:18 ` Fabrice Bellard
2006-04-12 23:15   ` Julian Seward [this message]

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