1 files changed, 34 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/20040324-1.c b/gcc/testsuite/gcc.dg/tree-ssa/20040324-1.c
new file mode 100644
index 000000000..be718aba6
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/20040324-1.c
@@ -0,0 +1,34 @@
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+/* Ensure that BIT_FIELD_REFs gets the appropriate VUSE.
+   Contributed by Paolo Bonzini  <bonzini@gnu.org>.
+
+   This testcase actually never triggered in the CVS repo, but it did
+   in my local tree and it seems worth testing.  In this test, the if's
+   are folded to BIT_FIELD_REFs but the VUSEs were erroneously left out.
+   Therefore, DOM did not see that i was modified between the two ifs
+   and optimized away the second if.  */
+
+extern void abort (void);
+extern void exit (int);
+
+struct x
+{
+  unsigned b:1;
+  unsigned c:1;
+};
+
+struct x i = { 1, 1 };
+
+int
+main ()
+{
+  i.b = 1;
+  if (i.b == 1 && i.c == 0)
+    exit (0);
+  i.c = 0;
+  if (i.b == 1 && i.c == 0)
+    exit (0);
+  abort ();
+}