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Re: [Qemu-devel] [PATCH 1/2] softfloat: Enable run-time-configurable mea

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH 1/2] softfloat: Enable run-time-configurable meaning of signaling NaN bit
Date: Mon, 4 Apr 2016 20:38:54 +0100

On 4 April 2016 at 20:37, Eduardo Habkost <address@hidden> wrote:
> On Mon, Apr 04, 2016 at 02:31:47PM +0100, Peter Maydell wrote:
>> On 4 April 2016 at 14:21, Aleksandar Markovic
>> <address@hidden> 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.
> Even if it is not zeroed on reset, it is zeroed on object_new().
> Isn't that enough?

It must be zeroed on reset, otherwise we won't get the right
behaviour if you reset the CPU after running it for a bit.
object_new() zeroing is not sufficient.

-- PMM

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