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Re: [Qemu-devel] [PATCH v2 1/5] target-tricore: Added FTOUZ instruction

From: Bastian Koppelmann
Subject: Re: [Qemu-devel] [PATCH v2 1/5] target-tricore: Added FTOUZ instruction
Date: Tue, 8 Nov 2016 16:12:50 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

On 11/08/2016 04:06 PM, Richard Henderson wrote:
> On 11/08/2016 02:37 PM, Bastian Koppelmann wrote:
>> Consider 0x836d4e86 as an input which is clearly negative, however
>> float_flag_invalid is not set. The hardware on the other hand does set
>> it.
> Hmm.  This is -0x1.da9d0cp-121.  Softfloat claims that we should round
> to zero first, and only if the result is still < 0, raise invalid. 
> Which does sound plausible as a common behaviour.

TriCore does it the other way round.

> Does your hardware raise invalid for true -0.0, i.e. 0x80000000?

No, -0.0 does not raise invalid.


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