Sources to port fenv.h to ARM and AARCH64

[Aditya Upadhyay]

On Sat, 21 Mar 2020, 10:29 Eshan Dhawan, <eshandhawan51 at gmail.com> wrote:

> I went through the FreeBSD and NetBSD sources for implementation
> In FreeBSD there is an architecture-specific implementation with different
> header file for each architecture it supports .
> Whereas in NetBSD there is a single fenv.h defined but each architecture
> has its own C file to implement the functions.
> Also FreeBSD has soft-float for ARM
> So, I think FreeBSD would be a better option.
>

Look into this discussion on mail thread:
https://sourceware.org/legacy-ml/newlib/2017/msg00818.html

and this patch series on newlib mailing list.

https://sourceware.org/legacy-ml/newlib/2019/msg00418.html .

It will help to understand the fenv-stub code.



> On Sat, Mar 21, 2020 at 2:37 AM Joel Sherrill <joel at rtems.org> wrote:
>
>>
>>
>> On Fri, Mar 20, 2020 at 3:33 PM Eshan Dhawan <eshandhawan51 at gmail.com>
>> wrote:
>>
>>> thanks, dr Joel
>>>
>>> I had gone through the musl-libc library but it doesn't have much
>>> architecture specific support for ARM as well as AARCH64
>>> It has support for s390x, m68k, powerpc64
>>>
>>
>> This type of evaluation is important.  The architecture may be supported
>> in only one implementation or one may be more complete than another.
>>
>> Ignoring the license requirements of course.
>>
>>>
>>>
>>> On Sat, Mar 21, 2020 at 1:32 AM Joel Sherrill <joel at rtems.org> wrote:
>>>
>>>>
>>>>
>>>> On Fri, Mar 20, 2020 at 2:43 PM Eshan Dhawan <eshandhawan51 at gmail.com>
>>>> wrote:
>>>>
>>>>> What would be the preferred source to port fenv.h to ARM and AARCH64
>>>>> its implementation is present in both FreeBSD as well AS NetBSD
>>>>> -> ARM
>>>>> ---FreeBSD Source
>>>>> # https://github.com/freebsd/freebsd/tree/master/lib/msun/arm
>>>>> ---NetBSD Source
>>>>> # https://github.com/NetBSD/src/tree/trunk/lib/libm/arch/arm
>>>>>
>>>>> ->AARCH64
>>>>> ---FreeBSD Source
>>>>> # https://github.com/freebsd/freebsd/tree/master/lib/msun/aarch64
>>>>> ---NetBSD Source
>>>>> # https://github.com/NetBSD/src/tree/trunk/lib/libm/arch/aarch64
>>>>>
>>>>
>>>> Don't forget MUSL-C Library which has a lot of architectures and
>>>> is appropriately licensed.
>>>>
>>>> https://git.musl-libc.org/cgit/musl/tree/src/fenv
>>>>
>>>> I think our the order is going to be FreeBSD, NetBSD, then other places.
>>>>
>>>> The code drops into newlib's libm in a particular way which may require
>>>> some refactoring. fenv.h is shared across all ports and machine/fenv.h
>>>> is
>>>> where port code goes. There must be an architecture specific file for
>>>> each
>>>> method. But the entire implementation could go in one file and the
>>>> others
>>>> be stubs. The i386 does this.
>>>>
>>>> --joel
>>>>
>>>>>
>>>>>
>>>>> <https://github.com/NetBSD/src/tree/trunk/lib/libm/arch/aarch64>
>>>>>
>>>>> Thanks
>>>>> -Eshan
>>>>> _______________________________________________
>>>>> devel mailing list
>>>>> devel at rtems.org
>>>>> http://lists.rtems.org/mailman/listinfo/devel
>>>>
>>>> _______________________________________________
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