1 files changed, 20 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/pr45819.c b/gcc/testsuite/gcc.dg/pr45819.c
new file mode 100644
index 000000000..4979fd328
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr45819.c
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-optimized -w" } */
+
+struct ehci_regs {
+    char x;
+    unsigned int port_status[0];
+} __attribute__ ((packed));
+
+struct ehci_hcd {
+    struct ehci_regs *regs;
+};
+
+int ehci_hub_control (struct ehci_hcd *ehci, int wIndex)
+{
+  unsigned int *status_reg = &ehci->regs->port_status[wIndex];
+  return *(volatile unsigned int *)status_reg;
+}
+
+/* { dg-final { scan-tree-dump "={v}" "optimized" } } */
+/* { dg-final { cleanup-tree-dump "optimized" } } */