kern/133583: commit references a PR
dfilter service
dfilter at FreeBSD.ORG
Fri Dec 3 07:10:11 UTC 2010
The following reply was made to PR kern/133583; it has been noted by GNATS.
From: dfilter at FreeBSD.ORG (dfilter service)
To: bug-followup at FreeBSD.org
Cc:
Subject: Re: kern/133583: commit references a PR
Date: Fri, 3 Dec 2010 07:01:14 +0000 (UTC)
Author: das
Date: Fri Dec 3 07:01:07 2010
New Revision: 216142
URL: http://svn.freebsd.org/changeset/base/216142
Log:
Explain some of the reasons that fpsetprec() is unlikely to work as
one might expect. (These functions have already been deprecated for
many years.)
PR: 133583
Modified:
head/share/man/man3/fpgetround.3
Modified: head/share/man/man3/fpgetround.3
==============================================================================
--- head/share/man/man3/fpgetround.3 Fri Dec 3 04:39:48 2010 (r216141)
+++ head/share/man/man3/fpgetround.3 Fri Dec 3 07:01:07 2010 (r216142)
@@ -32,7 +32,7 @@
.\" @(#)fpgetround.3 1.0 (Berkeley) 9/23/93
.\" $FreeBSD$
.\"
-.Dd August 23, 1993
+.Dd December 3, 2010
.Dt FPGETROUND 3
.Os
.Sh NAME
@@ -164,6 +164,10 @@ and
.Fn fpsetprec
functions provide functionality unavailable on many platforms.
At present, they are implemented only on the i386 and amd64 platforms.
+Changing precision isn't a supported feature:
+it may be ineffective when code is compiled to take advantage of SSE,
+and many library functions and compiler optimizations depend upon the
+default precision for correct behavior.
.Sh SEE ALSO
.Xr fenv 3 ,
.Xr isnan 3
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