summaryrefslogtreecommitdiffstats
path: root/lib/msun/src/e_jn.c
Commit message (Collapse)AuthorAgeFilesLines
* MFC r271651, r271719, r272138, r272457, r272845, r275476, r275518, r275614,tijl2015-06-251-3/+7
| | | | | | | | r275819, r276176, r278154, r278160, r278339, r279127, r279240, r279491, r279493, r279856, r283032, r284423, r284426, r284427, r284428 Merge changes to libm from the past 9 months. This includes improvements to the Bessel functions and adds the C99 function lgammal.
* Fix bug in jn(3) and jnf(3) that led to -inf resultsuqs2010-11-131-1/+6
| | | | | | | | | | | | | | | | | | | | Explanation by Steve: jn[f](n,x) for certain ranges of x uses downward recursion to compute the value of the function. The recursion sequence that is generated is proportional to the actual desired value, so a normalization step is taken. This normalization is j0[f](x) divided by the zeroth sequence member. As Bruce notes, near the zeros of j0[f](x) the computed value can have giga-ULP inaccuracy. I found for the 1st zero of j0f(x) only the leading decimal digit is correct. The solution to the issue is fairly straight forward. The zeros of j0(x) and j1(x) never coincide, so as j0(x) approaches a zero, the normalization constant switches to j1[f](x) divided by the 2nd sequence member. The expectation is that j1[f](x) is a more accurately computed value. PR: bin/144306 Submitted by: Steven G. Kargl <kargl@troutmask.apl.washington.edu> Reviewed by: bde MFC after: 7 days
* s/rcsid/__FBSDID/das2008-02-221-3/+2
|
* Reduce diffs against vendor source (Sun fdlibm 5.3).das2005-02-041-19/+20
|
* Fix formatting, this is hard to explain, so I'll show one example.alfred2002-05-281-2/+4
| | | | | | | | | | - float ynf(int n, float x) /* wrapper ynf */ +float +ynf(int n, float x) /* wrapper ynf */ This is because the __STDC__ stuff was indented. Reviewed by: md5
* Assume __STDC__, remove non-__STDC__ code.alfred2002-05-281-18/+0
| | | | Reviewed by: md5
* $Id$ -> $FreeBSD$peter1999-08-281-1/+1
|
* Revert $FreeBSD$ to $Id$peter1997-02-221-1/+1
|
* Make the long-awaited change from $Id$ to $FreeBSD$jkh1997-01-141-1/+1
| | | | | | | | This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
* Remove trailing whitespace.rgrimes1995-05-301-22/+22
|
* Submitted by: J.T. Conklin <jtc@wimsey.com>bde1995-04-071-2/+2
| | | | | First part of update to fdlibm 5.2: fix jn(n, x) and jnf(n, x). jn(-1, x) was too large by a factor of 3.
* J.T. Conklin's latest version of the Sun math library.jkh1994-08-191-0/+281
-- Begin comments from J.T. Conklin: The most significant improvement is the addition of "float" versions of the math functions that take float arguments, return floats, and do all operations in floating point. This doesn't help (performance) much on the i386, but they are still nice to have. The float versions were orginally done by Cygnus' Ian Taylor when fdlibm was integrated into the libm we support for embedded systems. I gave Ian a copy of my libm as a starting point since I had already fixed a lot of bugs & problems in Sun's original code. After he was done, I cleaned it up a bit and integrated the changes back into my libm. -- End comments Reviewed by: jkh Submitted by: jtc
OpenPOWER on IntegriCloud