testsuite: Add testcase for already fixed PR [PR117498]

This wrong-code issue has been fixed with r15-7249.
We still emit warnings which are questionable and perhaps we'd
get better generated code if niters determined the loop has only a single
iteration without UB and we'd punt on vectorizing it (or unrolling).

2025-01-31  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/117498
	* gcc.c-torture/execute/pr117498.c: New test.

diff --git a/gcc/testsuite/gcc.c-torture/execute/pr117498.c b/gcc/testsuite/gcc.c-torture/execute/pr117498.c
new file mode 100644 (file)
index 0000000..085c6b6
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/pr117498.c
@@ -0,0 +1,35 @@
+/* PR middle-end/117498 */
+
+int a, d, f;
+char g;
+volatile int c = 1;
+
+int
+foo ()
+{
+  if (c == 0)
+    return -1;
+  return 1;
+}
+
+void
+bar (int h, int i, char *k, char *m)
+{
+  for (; d < i; d += 2)
+    for (int j = 0; j < h; j++)
+      m[j] = k[4 * j];
+}
+
+void
+baz (long h)
+{
+  char n = 0;
+  bar (h, 4, &n, &g);
+}
+
+int
+main ()
+{
+  f = foo ();
+  baz ((unsigned char) f - 4);
+}