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248 Commits

Author SHA1 Message Date
David Schultz
57276bb6ea Un-document the non-extant exp10() and exp10f() functions. 
exp10() was a casualty of the transition away from the VAX.
 2005-02-26 08:54:45 +00:00
David Schultz
aa28340df9 Revert rev 1.8, which causes small (e.g. 2 ulp) errors for some 
inputs.  The trouble with replacing two floats with a double is that
the latter has 6 extra bits of precision, which actually hurts
accuracy in many cases.  All of the constants are optimal when float
arithmetic is used, and would need to be recomputed to do this right.

Noticed by:	bde (ucbtest)
 2005-02-24 06:32:13 +00:00
David Schultz
adec44c08b Use hardware instructions for sqrt() and sqrtf(). 2005-02-21 18:27:57 +00:00
David Schultz
96efaf6c36 Use double arithmetic instead of simulating it with two floats. This 
results in a performance gain on the order of 10% for amd64 (sledge),
ia64 (pluto1), i386+SSE (Pentium 4), and sparc64 (panther), and a
negligible improvement for i386 without SSE.  (The i386 port still
uses the hardware instruction, though.)
 2005-02-21 17:44:57 +00:00
David Schultz
f674c13c78 Remove the i387 versions of atan(), atan2(), and atan2f(). 
They are slower than the MI routines on modern hardware,
except for degenerate cases such as the Pentium 4.

PR:		67469
 2005-02-21 16:04:23 +00:00
David Schultz
c4691a5da9 Remove i387 versions of asin() and acos(). Although the hardware 
instruction was faster on the 486, it's slower than our MD version on
modern processors.

Determined by:	bde
PR:		67469
 2005-02-20 22:51:08 +00:00
David Schultz
dab1571b90 Remove the float versions of the i387 trig functions obtained from 
NetBSD.  They're buggy, giving particularly for inputs larger in
magnitude than 2**63.

Noticed by:	bde
PR:		67469
 2005-02-20 22:50:40 +00:00
David Schultz
e02846ce13 Fix a small scripting snafu in the previous revision. 2005-02-04 20:05:39 +00:00
David Schultz
b21154f677 Remove another vestige of support for a non-IEEE libm. 2005-02-04 18:32:13 +00:00
David Schultz
3f70824172 Reduce diffs against vendor source (Sun fdlibm 5.3). 2005-02-04 18:26:06 +00:00
David Schultz
79b990338f Move machine-dependent crud to its own makefile. 2005-02-04 14:33:39 +00:00
David Schultz
e1b61b5b93 Remove wrappers and other cruft intended to support SVID, mistakes in 
C90, and other arcana.  Most of these features were never fully
supported or enabled by default.

Ok:	bde, stefanf
 2005-02-04 14:08:32 +00:00
Ruslan Ermilov
1f8ee0e102 Typo. 2005-01-28 21:14:16 +00:00
Ruslan Ermilov
d7a604cc33 Properly terminate sentence. 2005-01-28 21:13:34 +00:00
David Schultz
29bf6af890 - 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.
 2005-01-27 05:46:17 +00:00
Olivier Houchard
15d3b4db61 Define FE_TONEAREST, FE_TOWARDZERO, FE_UPWARD, FE_DOWNWARD and _ROUND_MASK to 
unbreak the build for arm.
 2005-01-24 00:35:02 +00:00
David Schultz
cb2d2321cd Update comment to reflect the code change in the previous revision. 
Noticed by:	ceri
 2005-01-23 22:56:08 +00:00
David Schultz
52611c608e 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.
 2005-01-23 22:05:33 +00:00
David Schultz
3c4d0a0973 If x == y, return y, not x. C99 (though not IEEE 754) requires that 
nextafter(+0.0, -0.0) returns -0.0 and nextafter(-0.0, +0.0) returns +0.0.
 2005-01-23 15:46:22 +00:00
David Schultz
d5580d091a Add fma() and fmaf(), which implement a fused multiply-add operation. 2005-01-22 09:53:18 +00:00
Ruslan Ermilov
24a0682c64 Sort sections. 2005-01-20 09:17:07 +00:00
Ruslan Ermilov
5391441c05 Use the \*(If string provided by mdoc(7), to represent infinity. 2005-01-16 16:49:10 +00:00
Ruslan Ermilov
1fbb01b7f0 Removed redundant .br call. 2005-01-16 16:46:14 +00:00
David Schultz
cd3cc47033 amd64 assembly versions of sqrt(), lrint(), and llrint() using SSE2. 2005-01-15 03:32:28 +00:00
David Schultz
b6e65225a6 Most libm routines depend on the rounding mode and/or set exception 
flags, so they are not pure.  Remove the __pure2 annotation from them.
I believe that the following routines and their float and long double
counterparts are the only ones here that can be __pure2:

	copysign is* fabs finite fmax fmin fpclassify ilogb nan signbit

When gcc supports FENV_ACCESS, perhaps there will be a new annotation
that allows the other functions to be considered pure when FENV_ACCESS
is off.

Discussed with:	bde
 2005-01-15 02:55:10 +00:00
David Schultz
71936f351e Braino. Revert rev 1.50. 
Pointy hat to:	das
 2005-01-15 00:37:31 +00:00
David Schultz
8e26469445 Remove numerous references to VAX floating-point and the setting of 
errno, replacing them with a discussion of IEEE exceptions where
appropriate.  Cross-reference fenv(3) whenever exceptions are
mentioned.
 2005-01-14 23:28:28 +00:00
David Schultz
ce4e53c460 Set math_errhandling to MATH_ERREXCEPT. Now that we have fenv.h, we 
basically support this, subject to gcc's lack of FENV_ACCESS support.
In any case, the previous setting of math_errhandling to 0 is not
allowed by POSIX.
 2005-01-14 22:03:27 +00:00
David Schultz
c165c4b9aa Remove some #if 0'd code. 2005-01-14 21:51:46 +00:00
Ruslan Ermilov
e880667b92 Tiny markup nits. 2005-01-14 09:12:05 +00:00
David Schultz
f365db00e5 Mark all inline asms that read the floating-point control or status 
registers as volatile.  Instructions that *wrote* to FP state were
already marked volatile, but apparently gcc has license to move
non-volatile asms past volatile asms.  This broke amd64's feupdateenv
at -O2 due to a WAR conflict between fnstsw and fldenv there.
 2005-01-14 07:09:23 +00:00
Stefan Farfeleder
749f5f532e Fixed too many of "the", and enclose multi-word argument in double quotes. 
Obtained from:	ru
 2005-01-13 20:33:42 +00:00
David Schultz
fe69257da2 Import the subset of J.T. Conklin's single-precision x86-optimized 
math routines that appear to be (a) correct and (b) faster than their
MI counterparts on my Pentium 4.

Obtained from:	NetBSD
 2005-01-13 18:58:25 +00:00
David Schultz
0d8f9eca28 The isnormal() in rev 1.2 should have been isfinite() so subnormals 
round correctly.

Noticed by:	stefanf
 2005-01-13 15:43:41 +00:00
David Schultz
3cdb8115d7 Things that are broken, unneeded, and unused since 1997 belong in the attic. 2005-01-13 15:43:22 +00:00
Ruslan Ermilov
83e0359d53 Markup nits. 2005-01-13 10:43:01 +00:00
Ruslan Ermilov
113ed1bb1d Fixed too many of "the", and enclose multi-word argument in double quotes. 2005-01-13 09:35:47 +00:00
Stefan Farfeleder
43295fac79 Implement and document ceill(). 2005-01-13 09:11:41 +00:00
Stefan Farfeleder
4067ee86a5 Bump .Dd for the last commit. 2005-01-13 09:08:16 +00:00
Stefan Farfeleder
7e2ee1f065 Hook up and document floorl(). 2005-01-12 22:16:26 +00:00
Stefan Farfeleder
17f418f9f4 Implement floorl(). 2005-01-12 22:10:46 +00:00
Stefan Farfeleder
a7d82b7150 Whitespace nit. 2005-01-12 22:05:41 +00:00
David Schultz
10c9ffa425 Add MI implementations of [l]lrint[f]() and [l]lround[f](). 
Discussed with:	bde
 2005-01-11 23:12:55 +00:00
David Schultz
2aac156d2e Document [l]lrint[f]() and [l]lround[f](). 2005-01-11 23:12:17 +00:00
David Schultz
439e59cf85 Faster lrint() and llrint() implementations for x86. 2005-01-11 23:10:53 +00:00
David Schultz
c1b70ced4f Mark inline stmxcsr instructions as volatile, since this appears to be 
the only way to convince gcc that they read the MXCSR.  The volatile
annotation may be needed elsewhere as well.
 2005-01-11 22:10:43 +00:00
Ruslan Ermilov
2d82ac3110 Scheduled mdoc(7) sweep. 2005-01-11 20:50:51 +00:00
Ruslan Ermilov
4e05ab77a8 Sanitize the markup, as prompted. 2005-01-11 20:16:03 +00:00
David Schultz
527055d12f GC unused declaration 2004-12-16 20:40:49 +00:00
David Schultz
17519e9b79 Cosmetic changes only: 
- style
- remove unused variables
- de-support VAX

Inspired by:	bin/42388
 2004-12-16 20:40:37 +00:00