1 files changed, 26 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/torture/pr109609.c b/gcc/testsuite/gcc.dg/torture/pr109609.c
new file mode 100644
index 0000000..0e191cd
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr109609.c
@@ -0,0 +1,26 @@
+/* { dg-do run } */
+
+#define N 23
+#define MAX_LEN 13
+char dst[N + 1];
+
+void __attribute__((noipa))
+invert(const char *id)
+{
+  char buf[MAX_LEN];
+  char *ptr = buf + sizeof(buf);  // start from the end of buf
+  *(--ptr) = '\0';                // terminate string
+  while (*id && ptr > buf) {
+    *(--ptr) = *(id++);           // copy id backwards
+  }
+  __builtin_strncpy(dst, ptr, N);           // copy ptr/buf to dst
+}
+
+
+int main()
+{
+  invert("abcde");
+  if (__builtin_strcmp(dst, "edcba"))
+    __builtin_abort();
+  return 0;
+}