New test case (2.95.2 miscompilation)

From-SVN: r45505

gcc/testsuite/gcc.c-torture/execute/20010910-1.c

+/* Test case contributed by Ingo Rohloff <rohloff@in.tum.de>.
+   Code distilled from Linux kernel.  */
+
+/* Compile this program with a gcc-2.95.2 using
+   "gcc -O2" and run it. The result will be that
+   rx_ring[1].next == 0   (it should be == 14)
+   and
+   ep.skbuff[4] == 5      (it should be 0)
+*/
+
+extern void abort(void);
+
+struct epic_rx_desc 
+{
+  unsigned int next;
+};
+
+struct epic_private 
+{
+  struct epic_rx_desc *rx_ring;
+  unsigned int rx_skbuff[5];
+};
+
+static void epic_init_ring(struct epic_private *ep)
+{
+  int i;
+
+  for (i = 0; i < 5; i++) 
+  {
+    ep->rx_ring[i].next = 10 + (i+1)*2;
+    ep->rx_skbuff[i] = 0;
+  }
+  ep->rx_ring[i-1].next = 10;
+}
+
+static int check_rx_ring[5] = { 12,14,16,18,10 };
+
+int main(void)
+{
+  struct epic_private ep;
+  struct epic_rx_desc rx_ring[5];
+  int i;
+
+  for (i=0;i<5;i++)
+  {
+    rx_ring[i].next=0;
+    ep.rx_skbuff[i]=5;
+  }
+  
+  ep.rx_ring=rx_ring;
+  epic_init_ring(&ep);
+  
+  for (i=0;i<5;i++)
+  {
+    if ( rx_ring[i].next != check_rx_ring[i] ) abort();
+    if ( ep.rx_skbuff[i] != 0 ) abort();
+  }
+  return 0;
+}