Port from redhat/gcc-4_4-branch:

	2009-10-08  Jakub Jelinek  <jakub@redhat.com>
	* gcc.dg/debug/vta-2.c: New test.

	2009-09-30  Alexandre Oliva  <aoliva@redhat.com>
	* gcc.dg/debug/vta-1.c: New.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@152986 138bc75d-0d04-0410-961f-82ee72b054a4

2 files changed, 55 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/debug/vta-1.c b/gcc/testsuite/gcc.dg/debug/vta-1.c
new file mode 100644
index 00000000000..414083a09c0
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/debug/vta-1.c
@@ -0,0 +1,34 @@
+/* https://bugzilla.redhat.com/show_bug.cgi?id=521991#c5
+
+   Distilled from Linux XFS source code.  foo, inlined into bar, ends
+   up with debug stmts referencing the addressable variable b.
+   Optimization made it non-addressable, and then completely optimized
+   away, before we got a chance to rename (and discard) the occurrence
+   in the debug stmt.  When we did, we crashed, attempting to rename
+   an unreference variable.  */
+
+/* { dg-do compile } */
+
+static inline int
+foo (void *x, unsigned y)
+{
+  unsigned z = *(unsigned long *) x % y;
+  *(unsigned long *) x = *(unsigned long *) x / y;
+  return z;
+}
+
+struct S
+{
+  unsigned t;
+};
+
+void
+bar (struct S *x, int *y)
+{
+  int a = 0;
+  unsigned long b = x->t;
+  foo (&b, x->t);
+  for (;; a++)
+    if (b)
+      *y = 1;
+}
diff --git a/gcc/testsuite/gcc.dg/debug/vta-2.c b/gcc/testsuite/gcc.dg/debug/vta-2.c
new file mode 100644
index 00000000000..5d44262ec76
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/debug/vta-2.c
@@ -0,0 +1,21 @@
+/* { dg-do compile } */
+
+static int
+bar (void *a, unsigned int b, int n)
+{
+  int c = *(unsigned long *) a % b;
+  *(unsigned long *) a = (int) (*(unsigned long *) a) / b;
+  return c;
+}
+
+int
+foo (unsigned long x, int *y, int z)
+{
+  int level;
+  for (level = 0; level < *y; level++)
+    {
+      bar (&x, z, sizeof (x));
+      if (x)
+	return *y - 1;
+    }
+}