[PATCH 2/3] msvcrt: Improve sqrt accuracy and performance on i386.
Zebediah Figura (she/her)
zfigura at codeweavers.com
Tue Feb 2 18:06:27 CST 2021
On 2/2/21 4:38 PM, Piotr Caban wrote:
> Hi Zebediah,
>
>> On 2 Feb 2021, at 21:18, Zebediah Figura (she/her) <zfigura at codeweavers.com> wrote:
>>
>> IIRC from bug 50429, the asin results were affected by setting the x87 control word beforehand. Is that not the case for sqrt?
>
> The code only resets rounding mode (and preserves other control word bits). I haven’t tested all the x87 control word values but it seems to be matching with native. AFAIR asin was also ignoring rounding mode.
Ah, cool, I didn't pay attention to which bits this was actually setting.
>
> Thanks,
> Piotr
>
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