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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