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From: Peter Maydell <peter.maydell@linaro.org>
Date: Mon, 4 Apr 2016 14:31:47 +0100
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Subject: Re: [Qemu-devel] [PATCH 1/2] softfloat: Enable
 run-time-configurable meaning of signaling NaN bit
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To: Aleksandar Markovic <Aleksandar.Markovic@imgtec.com>
Cc: "ehabkost@redhat.com" <ehabkost@redhat.com>, "kbastian@mail.uni-paderborn.de" <kbastian@mail.uni-paderborn.de>, "mark.cave-ayland@ilande.co.uk" <mark.cave-ayland@ilande.co.uk>, "agraf@suse.de" <agraf@suse.de>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, "blauwirbel@gmail.com" <blauwirbel@gmail.com>, "jcmvbkbc@gmail.com" <jcmvbkbc@gmail.com>, Miodrag Dinic <Miodrag.Dinic@imgtec.com>, "qemu-arm@nongnu.org" <qemu-arm@nongnu.org>, "qemu-ppc@nongnu.org" <qemu-ppc@nongnu.org>, Petar Jovanovic <Petar.Jovanovic@imgtec.com>, "pbonzini@redhat.com" <pbonzini@redhat.com>, "edgar.iglesias@gmail.com" <edgar.iglesias@gmail.com>, "proljc@gmail.com" <proljc@gmail.com>, "gxt@mprc.pku.edu.cn" <gxt@mprc.pku.edu.cn>, Leon Alrae <Leon.Alrae@imgtec.com>, "afaerber@suse.de" <afaerber@suse.de>, "aurelien@aurel32.net" <aurelien@aurel32.net>, Richard Henderson <rth@twiddle.net>

On 4 April 2016 at 14:21, Aleksandar Markovic
<Aleksandar.Markovic@imgtec.com> wrote:
> B. arm - explicitely sets other fields of float_status,
>       explicit invocation of set_snan_bit_is_one(0) added

We zero the float_status structs on reset, because they are earlier
in the CPUARMState structure than the 'features' field (and so the
memset() in arm_cpu_reset() will clear them). So you don't
need to explicitly zero a field like this. I expect the other
architectures are the same.

thanks
-- PMM