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Re: [Qemu-devel] [PATCH 6/7] target-tricore: Add cmp.f instruction

From: Bastian Koppelmann
Subject: Re: [Qemu-devel] [PATCH 6/7] target-tricore: Add cmp.f instruction
Date: Tue, 8 Mar 2016 16:11:19 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 03/08/2016 03:42 PM, Richard Henderson wrote:
> On 03/08/2016 05:20 AM, Bastian Koppelmann wrote:
>> On 03/01/2016 07:21 PM, Richard Henderson wrote:
>>> On 03/01/2016 08:24 AM, Bastian Koppelmann wrote:
>>>> +
>>>> +    lt = float32_lt_quiet(arg1, arg2, &env->fp_status);
>>>> +    eq = float32_eq_quiet(arg1, arg2, &env->fp_status);
>>>> +    uo = float32_unordered(arg1, arg2, &env->fp_status);
>>> Do it in one step with float32_compare.
>>> You don't want _quiet; see below re psw_flags.
>> Unfortunately, if I don't use _quiet my tests fail against real
>> hardware...
> Fail in what way?  I don't think _quiet computes all of the bits you need.

Also as far as I see the softfloat implementation, _quiet only
determines whether an invalid exception is raised if the inputs are any
nans or just signaling nans.

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