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From: Joel Sherrill <joel@rtems.org>
To: Newlib <newlib@sourceware.org>
Subject: Revisiting More Complete long double Support
Date: Wed, 17 Aug 2022 17:06:25 -0500	[thread overview]
Message-ID: <CAF9ehCUXG5c1V0TAmJzQywu8u_mEsHhJhch03H61qsh9YuFBbw@mail.gmail.com> (raw)

Hi

I'm looking at newlib long double support again when sizeof(long double) !=
sizeof(double).

(1) Merged FreeBSD C code for long double math

FreeBSD has C code for long double math routines as default implementation:

https://github.com/freebsd/freebsd-src/tree/main/lib/msun/src

I **THINK** those will work if LDBL != DBL so that code might need the
ifdef for LDBL_EQ_DBL to pick the current newlib common implementation of
the method which just calls the normal version of the method.  I code even
add the files as XXX_freebsd.c and only add

ifdef _LDBL_EQ_DBL
long double
acosl (long double x)
{
  return acos(x);
}
#else
#include "acosl_freebsd.c"
#endif

which would definitely avoid edits to the FreeBSD source.

(2) More i386 assembly versions

Then there appears to be some long double methods for the i386/87 here
which newlib doesn't currently have:

https://github.com/freebsd/freebsd-src/tree/main/lib/msun/i387

Thoughts on adding this long double code from FreeBSD?

Thanks.

--joel

             reply	other threads:[~2022-08-17 22:06 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-17 22:06 Joel Sherrill [this message]
2022-08-18  7:57 ` Corinna Vinschen
2022-08-18 14:49   ` Joel Sherrill
2022-08-18 19:16     ` Corinna Vinschen
2022-08-18 19:31       ` Joel Sherrill
2022-08-18 22:16         ` Joel Sherrill
2022-08-19  9:19           ` Corinna Vinschen

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