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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/107315] support 128bit long double on aarch64 darwin
Date: Wed, 19 Oct 2022 16:42:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107315

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|The "long double float" is  |support 128bit long double
                   |only 64 bit on Apple        |on aarch64 darwin
                   |Silicon MacBook             |
   Last reconfirmed|                            |2022-10-19
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The ABI says long double is the same as double.
https://developer.apple.com/documentation/xcode/writing-arm64-code-for-appl=
e-platforms
:
```
The long double type is a double precision IEEE754 binary floating-point ty=
pe,
which makes it identical to the double type. This behavior contrasts to the
standard specification, in which a long double is a quad-precision, IEEE754
binary, floating-point type.
```

We could use libquadmath to add support for 128bit long double but it will =
take
someone to implement that.=