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-rw-r--r--string/test-ffs.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/string/test-ffs.c b/string/test-ffs.c
index bbe62786e0..ef40171551 100644
--- a/string/test-ffs.c
+++ b/string/test-ffs.c
@@ -43,6 +43,8 @@ DEFUN(main, (argc, argv),
   try (0, 0);
   for (i=0 ; i<32 ; i++)
     try (1<<i, i+1);
+  for (i=0 ; i<32 ; i++)
+    try ((~0 >> i) << i, i+1);
   try (0x80008000, 16);
 
   if (failures)