1 files changed, 80 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/loadpre6.c b/gcc/testsuite/gcc.dg/tree-ssa/loadpre6.c
new file mode 100644
index 000000000..e6130bbe7
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/loadpre6.c
@@ -0,0 +1,80 @@
+/* { dg-do compile } */ 
+/* { dg-options "-O2 -fdump-tree-pre-stats -fdump-tree-fre" } */
+#include <stddef.h>
+
+union tree_node;
+typedef union tree_node *tree;
+
+struct tree_common
+{
+  tree chain;
+};
+
+struct tree_list
+{
+  struct tree_common common;
+  tree value;
+};
+
+union tree_node
+
+{
+  struct tree_common common;
+  struct tree_list list;
+};
+
+extern void abort (void) __attribute__((noreturn));
+
+void __attribute__((noinline))
+foo (void)
+{
+  abort ();
+}
+
+/* There are some reloaded loads of *cell, and cell->common.chain on various
+   branches.  */
+void __attribute__((noinline))
+remove_useless_vars (tree *unexpanded_var_list, int dump_file)
+{
+  tree var, *cell;
+  int c = 0;
+  for (cell = unexpanded_var_list; *cell; )
+    {
+      var = (*cell)->list.value;
+      if (var)
+        {
+          if (dump_file)
+            foo ();
+
+          *cell = ((*cell)->common.chain);
+          continue;
+        }
+
+      cell = &((*cell)->common.chain);
+    }
+}
+extern void *malloc (__SIZE_TYPE__) __attribute__ ((malloc));
+
+int
+main (void)
+{
+  int i;
+  tree unexpanded_var_list, last = (tree) 0;
+
+  for (i = 0; i < 2; i++)
+    {
+      unexpanded_var_list = malloc (sizeof (struct tree_list));
+      unexpanded_var_list->list.value = (tree) (ptrdiff_t) (i & 1);
+      unexpanded_var_list->common.chain = last;
+      last = unexpanded_var_list;
+    }
+
+  remove_useless_vars (&unexpanded_var_list, 0);
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump-not "= unexpanded_var_list;" "fre" } } */
+/* { dg-final { scan-tree-dump-times "Eliminated: 1" 1 "pre" } } */
+/* { dg-final { scan-tree-dump-times "Insertions: 2" 1 "pre" } } */
+/* { dg-final { cleanup-tree-dump "fre" } } */
+/* { dg-final { cleanup-tree-dump "pre" } } */