Re: [Qemu-devel] Re: [PATCH] target-ppc: use float32_is_any_nan()

[Alexander Graf]

On 05.01.2011, at 18:14, Peter Maydell wrote:

> On 5 January 2011 16:59, Alexander Graf <address@hidden> wrote:
>> 
>> On 02.01.2011, at 13:06, Aurelien Jarno wrote:
>> 
>>> Use the new function float32_is_any_nan() instead of
>>> float32_is_quiet_nan() || float32_is_signaling_nan().
>>> 
>>> Cc: Alexander Graf <address@hidden>
>>> Signed-off-by: Aurelien Jarno <address@hidden>
>> 
>> I frankly have very little knowledge of FP stuff. Is any_nan really equal to 
>> quiet_nan || signaling_nan or would it cover more cases?
> 
> It is exactly equivalent -- all NaNs are either signalling or quiet.
> 
> (If you want to check this you don't need to know anything about floating
> point, all three functions are just acting on 32 bit values so you could
> in theory identify all the bit patterns they return true or false on...)

Yeah, reading on through the FP parts of the spec I realized that too :). 
Thanks for the clarification.

Acked-by: Alexander Graf <address@hidden>


Alex