msvcrt: improve accuracy of exp/pow/cosh and sinh

[Zheng Chen]

Hi Ruslan,

Sorry for the late reply.

Thanks for pointing out the problem, I havenot thought of the questions
before, and I found that this patch might also cause problems on other
platforms... However, here
<https://github.com/wine-compholio/wine-staging/tree/master/patches/msvcrt-Math_Precision>
is a patch created by Sebastian and it should work if your environment
supports coshl/sinhl.

Thank you again and wish you a good day! :)

Regards,
Zheng

2015-04-05 2:36 GMT+08:00 Ruslan Kabatsayev <b7.10110111 at gmail.com>:

> Hi,
>
> Are you sure this will be of any use if one selects SSE instead of x87
> instruction set to handle doubles (like -mfpmath=sse)? No one
> guarantees the functions like sinh will be evaluated on x87 FPU and
> even that this legacy instruction set will used at all.
>
> Regards,
> Ruslan
>
> On Sat, Apr 4, 2015 at 7:40 PM, Zheng Chen <chanchengcc at gmail.com> wrote:
> > The default fpu_cw = 0x27f makes the exp/pow/cosh/sinh functions
> producing
> > less accurate results. This patch temporally changes fpu_cw to 0x37f in
> > these functions for more accurate results.
> >
> > Thanks to Qian for his ideas.
> >
> > This patch fixes parts of these two bugs: 37149, 37150
> >
> >
> >
>
>
>
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