[PATCH] bcmp: note that this function is no longer legacy due to LLVM 9

[Shawn Landden <shawn@git.icu>]

Signed-off-by: Shawn Landden <shawn@git.icu>
---
 man3/bcmp.3 | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/man3/bcmp.3 b/man3/bcmp.3
index ba9838019..18d238720 100644
--- a/man3/bcmp.3
+++ b/man3/bcmp.3
@@ -70,15 +70,21 @@ T{
 .BR bcmp ()
 T}	Thread safety	MT-Safe
 .TE
 .SH CONFORMING TO
 4.3BSD.
-This function is deprecated (marked as LEGACY in POSIX.1-2001): use
-.BR memcmp (3)
-in new programs.
+This function was deprecated (marked as LEGACY) by POSIX.1-2001).
 POSIX.1-2008 removes the specification of
 .BR bcmp ().
+LLVM 9, released in 2019, revived
+.BR bcmp ()
+and generates calls to it instead of
+.BR memcmp (3)
+as appropiate as an optimization (as
+.BR bcmp ()
+need not traverse memory in-order).
+.\" http://releases.llvm.org/9.0.0/docs/ReleaseNotes.html#noteworthy-optimizations
 .SH SEE ALSO
 .BR bstring (3),
 .BR memcmp (3),
 .BR strcasecmp (3),
 .BR strcmp (3),
-- 
2.20.1