x86_64: Document libmvec vector functions accuracy [BZ #28766]

Document maximum 4 ulps accuracy for x86_64 libmvec functions.
This fixes BZ #28766.

Reviewed-By: Paul Zimmermann <Paul.Zimmermann@inria.fr>

diff --git a/manual/math.texi b/manual/math.texi
index e00871c..477a18b 100644 (file)
--- a/manual/math.texi
+++ b/manual/math.texi
@@ -1395,8 +1395,9 @@ The table lists the ULP values for different architectures.  Different
 architectures have different results since their hardware support for
 floating-point operations varies and also the existing hardware support
 is different.  Only the round-to-nearest rounding mode is covered by
-this table, and vector versions of functions are not covered.
-Functions not listed do not have known errors.
+this table.  Functions not listed do not have known errors.  Vector
+versions of functions in the x86_64 libmvec library have a maximum error
+of 4 ulps.
 
 @page
 @c This multitable does not fit on a single page