GNU C Library master sources branch master updated. glibc-2.24-487-g3fdf179

[jsm28 at sourceware dot org]

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=3fdf17926c09fd403dd499005650e148774f1018

commit 3fdf17926c09fd403dd499005650e148774f1018
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Fri Dec 16 23:41:00 2016 +0000

    Document sNaN argument error handling.
    
    TS 18661-1 says that "Whether a signaling NaN input causes a domain
    error is implementation-defined.".  Considering it a domain error
    would (given glibc's math_errhandling definition) mean setting errno
    to EDOM.  glibc consistently does not set errno for sNaN inputs
    (unless it does so for qNaN as well, i.e. iseqsig), so this patch adds
    documentation of the implementation-defined choice not to treat this
    case as a domain error.
    
    	* manual/arith.texi (Math Error Reporting): Document that sNaN
    	arguments are not considered domain errors.

diff --git a/ChangeLog b/ChangeLog
index 1d93077..5186792 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2016-12-16  Joseph Myers  <joseph@codesourcery.com>
+
+	* manual/arith.texi (Math Error Reporting): Document that sNaN
+	arguments are not considered domain errors.
+
 2016-12-16  Zack Weinberg <zackw@panix.com>
 	    Florian Weimer <fweimer@redhat.com>
 	    Nick Mathewson <nickm@torproject.org>
diff --git a/manual/arith.texi b/manual/arith.texi
index 41ab577..a20a4de 100644
--- a/manual/arith.texi
+++ b/manual/arith.texi
@@ -939,6 +939,11 @@ guaranteed; it is intended that @theglibc{} should set it when the
 underflow is to an appropriately signed zero, but not necessarily for
 other underflows.
 
+When a math function has an argument that is a signaling NaN,
+@theglibc{} does not consider this a domain error, so @code{errno} is
+unchanged, but the invalid exception is still raised (except for a few
+functions that are specified to handle signaling NaNs differently).
+
 Some of the math functions are defined mathematically to result in a
 complex value over parts of their domains.  The most familiar example of
 this is taking the square root of a negative number.  The complex math

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog         |    5 +++++
 manual/arith.texi |    5 +++++
 2 files changed, 10 insertions(+), 0 deletions(-)


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