1 files changed, 31 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/gcc.c-torture/compile/pr31797.c b/gcc-4.9/gcc/testsuite/gcc.c-torture/compile/pr31797.c
new file mode 100644
index 000000000..97958f389
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gcc.c-torture/compile/pr31797.c
@@ -0,0 +1,31 @@
+struct GTeth_desc
+{
+  unsigned ed_cmdsts;
+};
+struct GTeth_softc
+{
+  struct GTeth_desc txq_desc[32];
+  unsigned int txq_fi;
+  unsigned int txq_nactive;
+};
+
+void
+GTeth_txq_free (struct GTeth_softc *sc)
+{
+  struct GTeth_desc *txd = &sc->txq_desc[0];
+  txd->ed_cmdsts &= ~(1U << (31));
+}
+void
+GTeth_txq_done (struct GTeth_softc *sc)
+{
+  while (sc->txq_nactive > 0)
+    {
+      volatile struct GTeth_desc *txd = &sc->txq_desc[sc->txq_fi];
+      if (txd->ed_cmdsts)
+	{
+	  if (sc->txq_nactive == 1)
+	    return;
+	}
+      GTeth_txq_free (sc);
+    }
+}