Re: [Qemu-devel] [PATCH v2 06/27] fpu/softfloat: Canonicalize NaN fraction

[Richard Henderson <richard.henderson@linaro.org>]

On 05/14/2018 03:29 AM, Peter Maydell wrote:
> On 12 May 2018 at 01:42, Richard Henderson <richard.henderson@linaro.org> wrote:
>> Shift the NaN fraction to a canonical position, much like we do
>> for the fraction of normal numbers.  Immediately, this simplifies
>> the float-to-float conversion.  Later, this will facilitate
>> manipulation of NaNs within the shared code paths.
>>
>> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> 
> The commit message says it simplifies the float-to-float codepath,
> but the patch doesn't touch that: it's missing the part that was in
> v1 of the series that removed the
>         a.frac = a.frac << (64 - srcf->frac_size) >> (64 - dstf->frac_size);
> line and updated the associated comment.
> 
> Isn't that change necessary in this patch if we're changing the
> canonical representation of NaNs ?

With the reordering of the patches, the offending line never gets added.
So, yeah, the text should be re-worded here.


r~