Sources to port fenv.h to ARM and AARCH64

[Aditya Upadhyay]

On Sun, Mar 22, 2020 at 1:30 AM Joel Sherrill <joel at rtems.org> wrote:
>
>
>
> On Sat, Mar 21, 2020 at 3:03 AM Aditya Upadhyay <aadit0402 at gmail.com> wrote:
>>
>>
>>
>> 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.
>
>
> I am having trouble finding the implementation of any fenv method in the NetBSD code. I only am finding the weak alias mappings. Where is an example of the body of one of the methods in any architecture?
>

I have cloned this NetBSD Sources. As I can see those
architecture-specific implemented methods here. Please correct me if I
am looking into different than what you are looking for.

./lib/libm/arch/powerpc/fenv.c
./lib/libm/arch/sh/fenv.c
./lib/libm/arch/mips64/fenv.c
./lib/libm/arch/amd64/fenv.c
./lib/libm/arch/arm/fenv.c
./lib/libm/arch/i387/fenv.c
./lib/libm/arch/hppa/fenv.c
./lib/libm/arch/m88k/fenv.c
./lib/libm/arch/alpha/fenv.c
./lib/libm/arch/sparc64/fenv.c
./lib/libm/arch/aarch64/fenv.c
./regress/lib/libm/fenv/fenv.c

> --joel
>>
>>
>>
>>>
>>> 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
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Thanks
>>>>>>> -Eshan
>>>>>>> _______________________________________________
>>>>>>> devel mailing list
>>>>>>> devel at rtems.org
>>>>>>> http://lists.rtems.org/mailman/listinfo/devel
>>>
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