lib/msun: Cleanup after $FreeBSD$ removal

Remove no longer needed explicit inclusion of sys/cdefs.h.

PR: 276669
MFC after: 1 week

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 .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

Clean up libm use of the __ieee754_ prefix

This removes the __ieee754_ prefix from a number of the math functions.
msun/src/math_private.h contains the statement that

/*
* ieee style elementar

Clean up libm use of the __ieee754_ prefix

This removes the __ieee754_ prefix from a number of the math functions.
msun/src/math_private.h contains the statement that

/*
* ieee style elementary functions
*
* We rename functions here to improve other sources' diffability
* against fdlibm.
*/
#define __ieee754_sqrt sqrt
...

Here, fdlibm refers to https://netlib.org/fdlibm. It is seen from
https://netlib.org/fdlibm/readme that this prefix was used to
differentiate between different standards:

Wrapper functions will twist the result of the ieee754
function to comply to the standard specified by the value
of _LIB_VERSION
if _LIB_VERSION = _IEEE_, return the ieee754 result;
if _LIB_VERSION = _SVID_, return SVID result;
if _LIB_VERSION = _XOPEN_, return XOPEN result;
if _LIB_VERSION = _POSIX_, return POSIX/ANSI result.
(These are macros, see fdlibm.h for their definition.)

AFAICT, FreeBSD has never supported these wrappers. In addition, as C99,
principally the long double, functions were added to libm, this
convention was not maintained. Given that only 148 of 324 files under
lib/msun contain a "Copyright (C) 1993 by Sun Microsystems" statement,
the removal of the __ieee754_ prefix provides consistency across all
source files.

The last time someone compared lib/msun to fdlibm appears to be

commit 3f70824172feb82ea3dcdb3866b54fe0eb7cd890
Author: David Schultz <das@FreeBSD.org>
Date: Fri Feb 4 18:26:06 2005 +0000

Reduce diffs against vendor source (Sun fdlibm 5.3).

The most recent fdlibm RCS string that appears in a Sun Microsystem
copyrighted file is date "95/01/18". With Oracle Corporation's
acquisition of Sun Microsystems in 2009, it is unlikely that fdlibm will
ever be updated. A search for fdlibm at https://opensource.oracle.com/
yields no hits.

Finally, OpenBSD removed the use of this prefix over 21 years ago. pSee
revision 1.6 of OpenBSD's math_private.h.

Note: this does not drop the __ieee754_ prefix from the trigonometric
argument reduction functions, e.g., __ieee754_rem_pio2. These functions
are internal to the libm and exported through Symbol.map; and thus,
reserved for the implementation.

PR: 272783
MFC after: 1 week

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Merge ^/head r343807 through r343955.

Replace calls to sin(x) and cos(x) with a single call to sincos().
Replace calls to sinf(x) and cosf(x) with a single call to sincosf().

Submitted by: Steve Kargl <sgk@troutmask.apl.washington.edu>

Replace calls to sin(x) and cos(x) with a single call to sincos().
Replace calls to sinf(x) and cosf(x) with a single call to sincosf().

Submitted by: Steve Kargl <sgk@troutmask.apl.washington.edu>
Reviewed by: bde
Approved by: grog
MFC after: 3 days

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msun: reduce diff between src/e_j0.c and src/e_j0f.c

PR: 229501
MFC after: 1 week

Fix whitespace issues in bessel function routines.

PR: 229423
Submitted by: Steve Kargl <sgk@troutmask.apl.washington.edu>
MFC after: 3 days

Catch up with HEAD (r280229-r284686).

MFH: r282615-r283655

Sponsored by: The FreeBSD Foundation

Merge sync of head

In r279493, the functions pzero[f](), qzero[f], pone[f](),
and qone[f]() were marked as __inline, but their forward
declarations were not updated. Fix the forward declarations
to match the actual fu

In r279493, the functions pzero[f](), qzero[f], pone[f](),
and qone[f]() were marked as __inline, but their forward
declarations were not updated. Fix the forward declarations
to match the actual function declarations.

Requested by: bde

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MFH: r278968-r280640

Sponsored by: The FreeBSD Foundation

Merge r278538 through r280226.

Merge from head

Merge ^/head r279759 through r279892.

According to POSIX.1-2008, the Bessel functions of second kind
should raise a divide-by-zero floating point exception for x = +-0
and an invalid floating point exception for x < 0 including x = -Inf

According to POSIX.1-2008, the Bessel functions of second kind
should raise a divide-by-zero floating point exception for x = +-0
and an invalid floating point exception for x < 0 including x = -Inf.
Update the code to raise the exception and update the documentation
with hopefully better description of the behavior.

Reviewed by: bde (code only)

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Merge from head

Merge ^/head r279313 through r279595.

Merge r278538 through r279514.

Give compilers a stronger hint to inline the functions
pzero[f], qzero[f], pone[f], and qone[f]. While here
fix the function declarations in accordance with style(9).

Merge ^/head r279163 through r279308.

msun: drop unnecessary checks (part 2).

Drop an unnecessary check in some calculations. The check
would have Coverity falsely conclude that a variable could
be left undefined.

Merge ^/head r279023 through r279162.

msun: drop unnecessary checks.

Drop an unnecessary check in some calculations. The check
would have Coverity falsely conclude that variables could
be left undefined.

Discussed with: kargl, bde
Revi

msun: drop unnecessary checks.

Drop an unnecessary check in some calculations. The check
would have Coverity falsely conclude that variables could
be left undefined.

Discussed with: kargl, bde
Reviewed by: bde

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