commit 04d60ce0f21ffe2a4add148cb37a1942dbad64e2
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Feb 17 08:10:35 2022 -0800

    string: Add a testcase for wcsncmp with SIZE_MAX [BZ #28755]
    
    Verify that wcsncmp (L("abc"), L("abd"), SIZE_MAX) == 0.  The new test
    fails without
    
    commit ddf0992cf57a93200e0c782e2a94d0733a5a0b87
    Author: Noah Goldstein <goldstein.w.n@gmail.com>
    Date:   Sun Jan 9 16:02:21 2022 -0600
    
        x86: Fix __wcsncmp_avx2 in strcmp-avx2.S [BZ# 28755]
    
    and
    
    commit 7e08db3359c86c94918feb33a1182cd0ff3bb10b
    Author: Noah Goldstein <goldstein.w.n@gmail.com>
    Date:   Sun Jan 9 16:02:28 2022 -0600
    
        x86: Fix __wcsncmp_evex in strcmp-evex.S [BZ# 28755]
    
    This is for BZ #28755.
    
    Reviewed-by: Sunil K Pandey <skpgkp2@gmail.com>
    
    (cherry picked from commit aa5a720056d37cf24924c138a3dbe6dace98e97c)

diff --git a/string/test-strncmp.c b/string/test-strncmp.c
index 10b34de8d2acb2a1..97e831d88fd24316 100644
--- a/string/test-strncmp.c
+++ b/string/test-strncmp.c
@@ -435,6 +435,18 @@ check3 (void)
 	}
 }
 
+static void
+check4 (void)
+{
+  const CHAR *s1 = L ("abc");
+  CHAR *s2 = STRDUP (s1);
+
+  FOR_EACH_IMPL (impl, 0)
+    check_result (impl, s1, s2, SIZE_MAX, 0);
+
+  free (s2);
+}
+
 int
 test_main (void)
 {
@@ -445,6 +457,7 @@ test_main (void)
   check1 ();
   check2 ();
   check3 ();
+  check4 ();
 
   printf ("%23s", "");
   FOR_EACH_IMPL (impl, 0)