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From: "joseph at codesourcery dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug math/28472] pow(10, i) accuracy
Date: Tue, 19 Oct 2021 21:42:16 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28472

--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery =
dot com> ---
"aren't bugs" means "the accuracy goals for libm functions are documented=20
in the glibc manual, and a small error for most functions is within those=20
goals" (and even if we strengthened the goals, they'd still allow last-bit=
=20
errors).

The IEEE 754 recommended correctly-rounded operations correspond to=20
functions such as cr_exp10 (names reserved in C23), which are probably not=
=20
in scope for glibc considering the difficulty in providing such functions=20
across the various floating-point formats supported (determining worst=20
cases for correct rounding still requires unfeasible resources for=20
binary128) and the maintainability and usability problems with having a=20
supported API with arbitrary variations in what functions are supported=20
for what types.

--=20
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