1 files changed, 44 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.c-torture/execute/ffs-2.c b/gcc/testsuite/gcc.c-torture/execute/ffs-2.c
new file mode 100644
index 000000000..ae246cebf
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/ffs-2.c
@@ -0,0 +1,44 @@
+struct
+  {
+    int input;
+    int output;
+  }
+ffstesttab[] =
+  {
+#if __INT_MAX__ >= 2147483647
+    /* at least 32-bit integers */
+    { 0x80000000, 32 },
+    { 0xa5a5a5a5, 1 },
+    { 0x5a5a5a5a, 2 },
+    { 0xcafe0000, 18 },
+#endif
+#if __INT_MAX__ >= 32767
+    /* at least 16-bit integers */
+    { 0x8000, 16 },
+    { 0xa5a5, 1 },
+    { 0x5a5a, 2 },
+    { 0x0ca0, 6 },
+#endif
+#if __INT_MAX__ < 32767
+#error integers are too small
+#endif
+  };
+
+#define NFFSTESTS (sizeof (ffstesttab) / sizeof (ffstesttab[0]))
+
+extern void abort (void);
+extern void exit (int);
+
+int
+main (void)
+{
+  int i;
+
+  for (i = 0; i < NFFSTESTS; i++)
+    {
+      if (__builtin_ffs (ffstesttab[i].input) != ffstesttab[i].output)
+	abort ();
+    }
+
+  exit (0);
+}