commit 1bb28b7b4f01709b841c86850e1bb83b554feafe
Author: Kuan-Wei Chiu <visitorckw@gmail.com>
Date:   Tue Jan 16 10:16:57 2024 +0800

    stdlib: Verify heapsort for two-element cases
    
    Adjust the testing approach to start from scenarios with only 2
    elements, as insertion sort no longer handles such cases.
    
    Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

diff --git a/stdlib/tst-qsort4.c b/stdlib/tst-qsort4.c
index 4cf373f22e28fade..7909793d9eb3edc7 100644
--- a/stdlib/tst-qsort4.c
+++ b/stdlib/tst-qsort4.c
@@ -96,9 +96,7 @@ do_test (void)
   check_one_sort ((signed char[16]) {15, 3, 4, 2, 1, 0, 8, 7, 6, 5, 14,
                                      13, 12, 11, 10, 9}, 16);
 
-  /* Array lengths 2 and less are not handled by heapsort_r and
-     deferred to insertion sort.  */
-  for (int i = 3; i <= 8; ++i)
+  for (int i = 2; i <= 8; ++i)
     {
       signed char *buf = xmalloc (i);
       check_combinations (i, buf, 0);