lib: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl s

lib: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

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Remove $FreeBSD$: one-line nroff pattern

Remove /^\.\\"\s*\$FreeBSD\$$\n/

Merge ^/head r351317 through r351731.

Introduce <sys/qmath.h>, a fixed-point math library from Netflix.

This makes it possible to perform mathematical operations
on
fractional values without using floating point. It operates on Q
number

Introduce <sys/qmath.h>, a fixed-point math library from Netflix.

This makes it possible to perform mathematical operations
on
fractional values without using floating point. It operates on Q
numbers, which are integer-sized, opaque structures initialized
to hold a chosen number of integer and fractional
bits.


For a general description of the Q number system, see the "Fixed Point
Representation & Fractional Math" whitepaper[1]; for the actual
API see the qmath(3) man page.

This is one of dependencies for the upcoming stats(3) framework[2]
that will be applied to the TCP stack in a later commit.

1. https://www.superkits.net/whitepapers/Fixed%20Point%20Representation%20&%20Fractional%20Math.pdf
2. https://reviews.freebsd.org/D20477

Reviewed by: bcr (man pages, earlier version), sef (earlier version)
Discussed with: cem, dteske, imp, lstewart
Sponsored By: Klara Inc, Netflix
Obtained from: Netflix
Differential Revision: https://reviews.freebsd.org/D20116

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Remove the sentence in math(3) about some long double math functions not
being available.

Submitted by: Steve Kargl
MFC after: 3 days

Merge ^/head r314420 through r314481.

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96

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IFC @230489 (pending review).

IFC @ r226824

It's no longer accurate to say that math.h "constitute[s] the C math
library," since complex.h, tgmath.h, and fenv.h are also part of the
math library. Replace the outdated sentence with some refere

It's no longer accurate to say that math.h "constitute[s] the C math
library," since complex.h, tgmath.h, and fenv.h are also part of the
math library. Replace the outdated sentence with some references to
the other parts.

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Implement the long double version for the cube root function, cbrtl.
The algorithm uses Newton's iterations with a crude estimate of the
cube root to converge to a result.

Reviewed by: bde
Approved

Implement the long double version for the cube root function, cbrtl.
The algorithm uses Newton's iterations with a crude estimate of the
cube root to converge to a result.

Reviewed by: bde
Approved by: das

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Sync: merge r216133 through r216338 from ^/head.

Fix various nits in style and comments that were pointed out by bde.
Code changes verified with md5.

Add log2() and log2f().

mdoc: Garbage collect unused/unneeded macros

Document the fact that we have nan(3) now, and make some minor clarifications
in other places.

Remove California Regent's clause 3, per letter

-mdoc sweep.

The logb() functions are not just ieee754 "test" functions, but are
standard in C99 and POSIX.1-2001+. They are also not deprecated, since
apart from being standard they can handle special args slig

The logb() functions are not just ieee754 "test" functions, but are
standard in C99 and POSIX.1-2001+. They are also not deprecated, since
apart from being standard they can handle special args slightly better
than the ilogb() functions.

Move their documentation to ilogb.3. Try to use consistent and improved
wording for both sets of functions. All of ieee854, C99 and POSIX
have better wording and more details for special args.

Add history for the logb() functions and ilogbl(). Fix history for
ilogb().

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Markup nit.

Approved by: re (blanket)

Document exp2() and exp2f(), and make other minor tweaks and updates.

Implement and document remquo() and remquof().

Add nexttoward to the list of implemented functions, and explicitly
list the four that are still missing.

- Move the functions presently described in in ieee(3) to their own
manpages. They are not very related, so separating them makes it
easier to add meaningful cross-references and extend some of

- Move the functions presently described in in ieee(3) to their own
manpages. They are not very related, so separating them makes it
easier to add meaningful cross-references and extend some of the
descriptions.
- Move the part of math(3) that discusses IEEE 754 to the ieee(3)
manpage.

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Many changes, including the following major ones:
- Rearrange the list of functions into categories.
- Remove the ulps column. It was appropriate for only some
of the functions in the list, and co

Many changes, including the following major ones:
- Rearrange the list of functions into categories.
- Remove the ulps column. It was appropriate for only some
of the functions in the list, and correct for even fewer
of them.
- Add some new paragraphs, and remove some old ones about
NaNs that may do more harm than good.
- Document precisions other than double-precision.

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