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Re: [Qemu-devel] [PATCH v6 07/13] fpu: introduce hardfloat
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From: |
Richard Henderson |
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Subject: |
Re: [Qemu-devel] [PATCH v6 07/13] fpu: introduce hardfloat |
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Date: |
Tue, 4 Dec 2018 07:33:01 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 |
On 12/4/18 6:28 AM, Alex Bennée wrote:
> Emilio G. Cota <address@hidden> writes:
>> This assumes that QEMU is running on an IEEE754-compliant FPU and
>> that the rounding is set to the default (to nearest). The
>> implementation-dependent specifics of the FPU should not matter; things
>> like tininess detection and snan representation are still dealt with in
>> soft-fp. However, this approach will break on most hosts if we compile
>> QEMU with flags such as -ffast-math. We control the flags so this should
>> be easy to enforce though.
>
> We don't currently enforce this though although maybe that would be too
> much hand holding for compiler ricers hell bent on not understanding the
> flags they use.
We could always
#ifdef __FAST_MATH__
#error "Silliness like this will get you nowhere"
#endif
r~