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From: David Schultz <das@FreeBSD.org>
Date: Fri, 3 Dec 2010 07:01:07 +0000 (UTC)
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Subject: svn commit: r216142 - head/share/man/man3
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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