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Author SHA1 Message Date
das
ac2f0fe744 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
das
ba363997fb 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
das
347e711324 Use hardware instructions for sqrt() and sqrtf(). 2005-02-21 18:27:57 +00:00
das
c082951462 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
das
0ac8896337 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
das
967bb5dcb0 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
das
ef7a10667b 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
das
2992840cda Fix a small scripting snafu in the previous revision. 2005-02-04 20:05:39 +00:00
das
24d2516dd7 Remove another vestige of support for a non-IEEE libm. 2005-02-04 18:32:13 +00:00
das
a47af911ba Reduce diffs against vendor source (Sun fdlibm 5.3). 2005-02-04 18:26:06 +00:00
das
9aed1e79d6 Move machine-dependent crud to its own makefile. 2005-02-04 14:33:39 +00:00
das
ec83c7685d 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
ru
de77cf0b40 Typo. 2005-01-28 21:14:16 +00:00
ru
e1ad6e61cc Properly terminate sentence. 2005-01-28 21:13:34 +00:00
das
783f4bf0c2 - 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
cognet
fa9ea53805 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
das
d7cc82f1f2 Update comment to reflect the code change in the previous revision. 
Noticed by:	ceri
 2005-01-23 22:56:08 +00:00
das
df543e85ea 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
das
e52e82773b 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
das
d55cbb5c10 Add fma() and fmaf(), which implement a fused multiply-add operation. 2005-01-22 09:53:18 +00:00
ru
ed72feddcb Sort sections. 2005-01-20 09:17:07 +00:00
ru
8f12d81a1c Use the \*(If string provided by mdoc(7), to represent infinity. 2005-01-16 16:49:10 +00:00
ru
9bccb183eb Removed redundant .br call. 2005-01-16 16:46:14 +00:00
das
64168d93e5 amd64 assembly versions of sqrt(), lrint(), and llrint() using SSE2. 2005-01-15 03:32:28 +00:00
das
c7466a47ff 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
das
3e538fd2f7 Braino. Revert rev 1.50. 
Pointy hat to:	das
 2005-01-15 00:37:31 +00:00
das
df8ce09fbd 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
das
d6994ae2c3 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
das
f5638fda1e Remove some #if 0'd code. 2005-01-14 21:51:46 +00:00
ru
8ef2048534 Tiny markup nits. 2005-01-14 09:12:05 +00:00
das
4ec986eab3 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
stefanf
17c8f614b7 Fixed too many of "the", and enclose multi-word argument in double quotes. 
Obtained from:	ru
 2005-01-13 20:33:42 +00:00
das
20067523af 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
das
5670c96a33 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
das
ed0817dc30 Things that are broken, unneeded, and unused since 1997 belong in the attic. 2005-01-13 15:43:22 +00:00
ru
d9ecb772db Markup nits. 2005-01-13 10:43:01 +00:00
ru
a14720c679 Fixed too many of "the", and enclose multi-word argument in double quotes. 2005-01-13 09:35:47 +00:00
stefanf
1bca40ec75 Implement and document ceill(). 2005-01-13 09:11:41 +00:00
stefanf
8ce754f4eb Bump .Dd for the last commit. 2005-01-13 09:08:16 +00:00
stefanf
86ef5da3d7 Hook up and document floorl(). 2005-01-12 22:16:26 +00:00
stefanf
9704cf1a67 Implement floorl(). 2005-01-12 22:10:46 +00:00
stefanf
2f05f40a83 Whitespace nit. 2005-01-12 22:05:41 +00:00
das
75bc489b6d Add MI implementations of [l]lrint[f]() and [l]lround[f](). 
Discussed with:	bde
 2005-01-11 23:12:55 +00:00
das
0a78d59d1f Document [l]lrint[f]() and [l]lround[f](). 2005-01-11 23:12:17 +00:00
das
1426450140 Faster lrint() and llrint() implementations for x86. 2005-01-11 23:10:53 +00:00
das
850b1bf882 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
ru
5384a04b6a Scheduled mdoc(7) sweep. 2005-01-11 20:50:51 +00:00
ru
47082de5c6 Sanitize the markup, as prompted. 2005-01-11 20:16:03 +00:00
das
0ca0cdb376 GC unused declaration 2004-12-16 20:40:49 +00:00
das
8daeb2e028 Cosmetic changes only: 
- style
- remove unused variables
- de-support VAX

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