[Mesa-dev] [GSoC2016] Interested in implementing "Soft" double precision floating point support

[tournier.elie]

I found on PCC website that it was imported in OpenBSD and NetBSD system so
the license should be compatible.
I think I will use it as a base for add, multiply, absolute value, negate,
convert to/from single precision, and comparison functions.

Tomorrow, I will make a draft of my proposal for GSoC in which I will
resume everything.

2016-03-11 22:00 GMT+01:00 Ian Romanick <idr at freedesktop.org>:

> On 03/10/2016 03:09 PM, Dylan Baker wrote:
> > Quoting Marek Olšák (2016-03-10 06:57:57)
> >> On Thu, Mar 10, 2016 at 3:30 PM, tournier.elie <tournier.elie at gmail.com>
> wrote:
> >>> First, thank you all for your answers.
> >>>
> >>> So if I summarize what was said, we need
> >>> Ian:
> >>>  - add
> >>>  - negate
> >>>  - absolute value
> >>>  - multiply
> >>>  - reciprocal
> >>>  - convert to single precision
> >>>  - convert from single precision
> >>> Roland:
> >>>  - sqrt
> >>>  - comparaison (< / == / >)
> >>>  - floor/ceil
> >>> I will contact Pat Brown (His name appear in the contact field in [1])
> to
> >>> know if we need the function below for implement gpu_shader_fp64.
> >>>  - pow
> >>>  - exp
> >>>  - log
> >>>
> >>> About the license
> >>>
> >>> Like I mentioned in the project description, there are quite a few
> >>> existing C implementations of these functions.  Finding one of those
> >>> that you can understand and that has a compatible license is probably
> >>> the best place to start.
> >>>
> >>> Main Mesa code is under MIT license.
> >>> If I chose to use a GNU GPL license file like Linux kernel [3], my
> code must
> >>> be under GNU GPL and probably all the project too. Am I right?
> >>>
> >>> [1] https://www.opengl.org/registry/specs/ARB/gpu_shader_fp64.txt
> >>> [2] http://www.mesa3d.org/license.html
> >>> [3]
> >>>
> https://github.com/torvalds/linux/blob/097f70b3c4d84ffccca15195bdfde3a37c0a7c0f/arch/arm/nwfpe/softfloat.c
> >>
> >> You can't use GNU GPL for this project.
> >>
> >> The kernel as a whole is licensed under GNU GPL, but some source files
> >> aren't. The file you linked doesn't mention GNU GPL. Somebody needs to
> >> verify that the file you linked can be legally re-licensed under the
> >> MIT license. If not, I think you have to forget the contents of the
> >> file immediately, but I'm not a lawyer.
> >>
> >> Marek
> >> _______________________________________________
> >> mesa-dev mailing list
> >> mesa-dev at lists.freedesktop.org
> >> https://lists.freedesktop.org/mailman/listinfo/mesa-dev
> >
> > Most BSD style licenses are legally compatible, as long as none of the
> > developers object. One of the BSD kernels should have a softfloat
> > implementation that would be license compatible.
>
> Yes, and there are a couple C compilers that have compatible licenses.
> Portable C Compiler (PCC) being one.  LLVM might also support some
> devices that lack floating-point hardware.
>
>
> > _______________________________________________
> > mesa-dev mailing list
> > mesa-dev at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/mesa-dev
> >
>
>
>
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