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Date: Fri, 9 Dec 2022 22:30:15 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: gzh2233 <gzh1754344759@....com>
Cc: musl@...ts.openwall.com
Subject: Re: ld128 math function support
* gzh2233 <gzh1754344759@....com> [2022-12-08 15:56:35 +0800]:
> I am trying to use ld128 in x86_64 musl and i have some problems.
that has multiple issues.
> Long double format is defined in arch/x86_64/bits/float.h and i am trying to
> change long double relevant macros. However, many long double functions
> still use double implementions(mostly "xxhl" functions). This is just a way to
> make musl compile and can be a problem in some cases. Simply changing
> the long double relevant macros can change ld80 into ld128 but this
> problem still exists.
>
>
> Is there any official support for long double math functions?
musl does not support long double == float128 on x86_64.
this is part of the abi.
if you add a new abi variant where long double is float128,
that works but many float128 math functions have low quality
currently as you noticed. fixing this is significant effort.
i don't have immediate plans to fix this.
another option is to keep long double as is but add _Float128
support and f128 math functions (on all targets). such support
would require additional work and increase the size of libc.so.
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