[cfe-dev] C runtimes with PowerPC support for IBM long double?

[Nemanja Ivanovic via cfe-dev]

Although I work on the PPC back end, I can't say I'm overly familiar with
long double support. But here's what I know...
On Linux, both gcc and glibc fully support IBM double+double format. Clang
supports it as well of course. It'll emit the necessary calls and I think
it does the right thing for compile-time calculations using APFloat.

So you should be able to use clang on Linux without any issues.
Furthermore, I believe compiler-rt should have the necessary support as
well so you should be able to use it on any OS that clang works on.

On Tue, Dec 5, 2017 at 10:02 PM, ardi via cfe-dev <cfe-dev at lists.llvm.org>
wrote:

> Hi,
>
> I have some old C code written for PowerPC long double (IBM
> double+double). I believe that clang supports generating IBM long
> double code for ppc targets (correct me if I'm wrong), but I'd like to
> know what C runtimes I could use together with clang in order to get
> this floating point format working.
>
> What I know for the moment:
>
> - The Apple libc of course supports the IBM long double (at least in
> versions older than when they removed ppc support).
>
> - Linux seems to support it too in glibc (didn't test it myself,
> though, so not 100% sure).
>
> - The musl library won't support that format, by design decision (they
> will only support standard formats).
>
> - The support for long double in NetBSD seems quite recent (added in
> 7.0 in preliminary status, if I'm reading the relnotes correctly, so I
> don't think IBM long double is supported at this point).
>
> - No idea about OpenBSD nor FreeBSD (couldn't find any docs referring
> to this, only the gcc manpage, but it's a manpage written by the gcc
> authors, so it doesn't cover the support in the C runtime of the OS).
>
> So, the only one that I know for sure supports this format is the
> Apple libc. If you know of more alternatives, please tell, as I'd like
> to continue working with this code.
>
> Thanks!
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