Update documentation now that CVSup service has been shutdown.
PR: 194916 Differential Revision: https://reviews.freebsd.org/D1137 Approved by: emaste, remko (mentor)
This commit is contained in:
Jason Helfman
parent
53a5f9cf5b
commit
866ca1aa07
Notes:
svn2git
2020-12-08 03:00:23 +00:00
svn path=/head/; revision=45969
1 changed files with 36 additions and 53 deletions
|
|
@ -547,7 +547,7 @@
|
||||||
<para>FreeBSD traces its roots back nearly twenty years to the
|
<para>FreeBSD traces its roots back nearly twenty years to the
|
||||||
work of the Computer Science Research Group at the
|
work of the Computer Science Research Group at the
|
||||||
University of California Berkeley.<footnote>
|
University of California Berkeley.<footnote>
|
||||||
<simpara>FreeBSD's <link xlink:href="http://cvsweb.freebsd.org/">source
|
<simpara>FreeBSD's <link xlink:href="http://svnweb.freebsd.org/">source
|
||||||
repository</link> contains a history of the project
|
repository</link> contains a history of the project
|
||||||
since its inception, and there are <link xlink:href="http://www.mckusick.com/csrg/">CDROMs
|
since its inception, and there are <link xlink:href="http://www.mckusick.com/csrg/">CDROMs
|
||||||
available</link> that contain earlier code from the
|
available</link> that contain earlier code from the
|
||||||
|
|
@ -581,28 +581,22 @@
|
||||||
<figure xml:id="fig-change-log">
|
<figure xml:id="fig-change-log">
|
||||||
<title>A sample change log entry</title>
|
<title>A sample change log entry</title>
|
||||||
<programlisting>
|
<programlisting>
|
||||||
bde 2005-10-29 16:34:50 UTC
|
r151864 | bde | 2005-10-29 09:34:50 -0700 (Sat, 29 Oct 2005) | 13 lines
|
||||||
|
Changed paths:
|
||||||
|
M /head/lib/msun/src/e_rem_pio2f.c
|
||||||
|
|
||||||
FreeBSD src repository
|
Use double precision to simplify and optimize arg reduction for small
|
||||||
|
and medium size args too: instead of conditionally subtracting a float
|
||||||
|
17+24, 17+17+24 or 17+17+17+24 bit approximation to pi/2, always
|
||||||
|
subtract a double 33+53 bit one. The float version is now closer to
|
||||||
|
the double version than to old versions of itself -- it uses the same
|
||||||
|
33+53 bit approximation as the simplest cases in the double version,
|
||||||
|
and where the float version had to switch to the slow general case at
|
||||||
|
|x| == 2^7*pi/2, it now switches at |x| == 2^19*pi/2 the same as the
|
||||||
|
double version.
|
||||||
|
|
||||||
Modified files:
|
This speeds up arg reduction by a factor of 2 for |x| between 3*pi/4 and
|
||||||
lib/msun/src e_rem_pio2f.c
|
2^7*pi/4, and by a factor of 7 for |x| between 2^7*pi/4 and 2^19*pi/4.
|
||||||
Log:
|
|
||||||
Use double precision to simplify and optimize arg reduction for small
|
|
||||||
and medium size args too: instead of conditionally subtracting a float
|
|
||||||
17+24, 17+17+24 or 17+17+17+24 bit approximation to pi/2, always
|
|
||||||
subtract a double 33+53 bit one. The float version is now closer to
|
|
||||||
the double version than to old versions of itself — it uses the same
|
|
||||||
33+53 bit approximation as the simplest cases in the double version,
|
|
||||||
and where the float version had to switch to the slow general case at
|
|
||||||
|x| == 2^7*pi/2, it now switches at |x| == 2^19*pi/2 the same as the
|
|
||||||
double version.
|
|
||||||
|
|
||||||
This speeds up arg reduction by a factor of 2 for |x| between 3*pi/4 and
|
|
||||||
2^7*pi/4, and by a factor of 7 for |x| between 2^7*pi/4 and 2^19*pi/4.
|
|
||||||
|
|
||||||
Revision Changes Path
|
|
||||||
1.14 +22 -97 src/lib/msun/src/e_rem_pio2f.c
|
|
||||||
</programlisting>
|
</programlisting>
|
||||||
</figure>
|
</figure>
|
||||||
|
|
||||||
|
|
@ -632,9 +626,9 @@ bde 2005-10-29 16:34:50 UTC
|
||||||
FreeBSD. For example:</para>
|
FreeBSD. For example:</para>
|
||||||
<formalpara>
|
<formalpara>
|
||||||
<title>Track FreeBSD source code</title>
|
<title>Track FreeBSD source code</title>
|
||||||
<para>The project makes it easy to mirror its CVS
|
<para>The project makes it easy to mirror its SVN
|
||||||
repository using <link xlink:href="&url.articles.cvsup-advanced;"><!--
|
repository using <link xlink:href="&url.articles.committers-guide;/article.html#svn-advanced-use-setting-up-svnsync"><!--
|
||||||
--><application>CVSup</application></link>. Having
|
--><application>svnsync</application></link>. Having
|
||||||
the complete history of the source is useful when
|
the complete history of the source is useful when
|
||||||
debugging complex problems and offers valuable insight
|
debugging complex problems and offers valuable insight
|
||||||
into the intentions of the original developers. Use a
|
into the intentions of the original developers. Use a
|
||||||
|
|
@ -642,43 +636,32 @@ bde 2005-10-29 16:34:50 UTC
|
||||||
easily merge changes between the upstream FreeBSD code
|
easily merge changes between the upstream FreeBSD code
|
||||||
base and your own in-house code.</para>
|
base and your own in-house code.</para>
|
||||||
</formalpara>
|
</formalpara>
|
||||||
<para><xref linkend="fig-cvs-annotate"/> shows a portion of
|
<para><xref linkend="fig-svn-blame"/> shows a portion of
|
||||||
an annotated listing of the file referenced by the
|
an annotated listing of the file referenced by the
|
||||||
change log in <xref linkend="fig-change-log"/>. The
|
change log in <xref linkend="fig-change-log"/>. The
|
||||||
ancestry of each line of the source is clearly visible.
|
ancestry of each line of the source is clearly visible.
|
||||||
Annotated listings showing the history of every file
|
Annotated listings showing the history of every file
|
||||||
that is part of FreeBSD are <link xlink:href="http://cvsweb.freebsd.org/">available on the
|
that is part of FreeBSD are <link xlink:href="http://svnweb.freebsd.org/">available on the
|
||||||
web</link>.</para>
|
web</link>.</para>
|
||||||
<figure xml:id="fig-cvs-annotate">
|
<figure xml:id="fig-svn-blame">
|
||||||
<title>An annotated source listing generated using <command>cvs annotate</command></title>
|
<title>An annotated source listing generated using <command>svn blame</command></title>
|
||||||
<programlisting>
|
<programlisting>
|
||||||
<![CDATA[
|
<![CDATA[
|
||||||
#LINE #REV #WHO #DATE #TEXT
|
#REV #WHO #DATE #TEXT
|
||||||
|
|
||||||
62 1.1 (jkh 19-Aug-94): int32_t __ieee754_rem_pio2f(float x, float *y)
|
176410 bde 2008-02-19 07:42:46 -0800 (Tue, 19 Feb 2008) #include <sys/cdefs.h>
|
||||||
63 1.1 (jkh 19-Aug-94): {
|
176410 bde 2008-02-19 07:42:46 -0800 (Tue, 19 Feb 2008) __FBSDID("$FreeBSD$");
|
||||||
64 1.14 (bde 29-Oct-05): double z,w,t,r,fn;
|
2116 jkh 1994-08-19 02:40:01 -0700 (Fri, 19 Aug 1994)
|
||||||
65 1.13 (bde 29-Oct-05): double tx[3];
|
2116 jkh 1994-08-19 02:40:01 -0700 (Fri, 19 Aug 1994) /* __ieee754_rem_pio2f(x,y)
|
||||||
66 1.14 (bde 29-Oct-05): int32_t e0,i,nx,n,ix,hx;
|
8870 rgrimes 1995-05-29 22:51:47 -0700 (Mon, 29 May 1995) *
|
||||||
67 1.1 (jkh 19-Aug-94):
|
176552 bde 2008-02-25 05:33:20 -0800 (Mon, 25 Feb 2008) * return the remainder of x rem pi/2 in *y
|
||||||
68 1.1 (jkh 19-Aug-94): GET_FLOAT_WORD(hx,x);
|
176552 bde 2008-02-25 05:33:20 -0800 (Mon, 25 Feb 2008) * use double precision for everything except passing x
|
||||||
69 1.1 (jkh 19-Aug-94): ix = hx&0x7fffffff;
|
152535 bde 2005-11-16 18:20:04 -0800 (Wed, 16 Nov 2005) * use __kernel_rem_pio2() for large x
|
||||||
70 1.1 (jkh 19-Aug-94): if(ix<=0x3f490fd8) /* |x| ~<= pi/4 , no need for reduction */
|
2116 jkh 1994-08-19 02:40:01 -0700 (Fri, 19 Aug 1994) */
|
||||||
71 1.1 (jkh 19-Aug-94): {y[0] = x; y[1] = 0; return 0;}
|
2116 jkh 1994-08-19 02:40:01 -0700 (Fri, 19 Aug 1994)
|
||||||
72 1.14 (bde 29-Oct-05): /* 33+53 bit pi is good enough for special and medium size cases */
|
176465 bde 2008-02-22 07:55:14 -0800 (Fri, 22 Feb 2008) #include <float.h>
|
||||||
73 1.2 (bde 07-Apr-95): if(ix<0x4016cbe4) { /* |x| < 3pi/4, special case with n=+-1 */
|
176465 bde 2008-02-22 07:55:14 -0800 (Fri, 22 Feb 2008)
|
||||||
74 1.14 (bde 29-Oct-05): if(hx>0) {
|
2116 jkh 1994-08-19 02:40:01 -0700 (Fri, 19 Aug 1994) #include "math.h"
|
||||||
75 1.15 (bde 06-Nov-05): z = x - pio2;
|
|
||||||
76 1.15 (bde 06-Nov-05): n = 1;
|
|
||||||
77 1.15 (bde 06-Nov-05): } else {
|
|
||||||
78 1.15 (bde 06-Nov-05): z = x + pio2;
|
|
||||||
79 1.15 (bde 06-Nov-05): n = 3;
|
|
||||||
80 1.9 (bde 08-Oct-05): }
|
|
||||||
81 1.15 (bde 06-Nov-05): y[0] = z;
|
|
||||||
82 1.15 (bde 06-Nov-05): y[1] = z - y[0];
|
|
||||||
83 1.15 (bde 06-Nov-05): return n;
|
|
||||||
84 1.15 (bde 06-Nov-05): }
|
|
||||||
85 1.15 (bde 06-Nov-05): if(ix<0x407b53d1) { /* |x| < 5*pi/4, special case with n=+-2 */
|
|
||||||
]]>
|
]]>
|
||||||
</programlisting>
|
</programlisting>
|
||||||
</figure>
|
</figure>
|
||||||
|
|
|
||||||
Loading…
Add table
Add a link
Reference in a new issue