2012-05-02  Jakub Jelinek  <jakub@redhat.com>

	PR debug/53174
	* tree-predcom.c (remove_stmt): Call reset_debug_uses on stmts being
	removed.

	* gcc.dg/pr53174.c: New test.

--- gcc/tree-predcom.c.jj	2012-03-28 19:39:21.000000000 +0200
+++ gcc/tree-predcom.c	2012-05-02 13:14:14.765575987 +0200
@@ -1707,6 +1707,7 @@ remove_stmt (gimple stmt)
     {
       name = PHI_RESULT (stmt);
       next = single_nonlooparound_use (name);
+      reset_debug_uses (stmt);
       psi = gsi_for_stmt (stmt);
       remove_phi_node (&psi, true);
 
@@ -1728,6 +1729,7 @@ remove_stmt (gimple stmt)
       gcc_assert (TREE_CODE (name) == SSA_NAME);
 
       next = single_nonlooparound_use (name);
+      reset_debug_uses (stmt);
 
       mark_virtual_ops_for_renaming (stmt);
       gsi_remove (&bsi, true);
--- gcc/testsuite/gcc.dg/pr53174.c.jj	2012-05-02 13:36:29.466948569 +0200
+++ gcc/testsuite/gcc.dg/pr53174.c	2012-05-02 13:35:59.000000000 +0200
@@ -0,0 +1,67 @@
+/* PR debug/53174 */
+/* { dg-do compile } */
+/* { dg-options "-Ofast -g" } */
+
+int w, h;
+
+void
+bar (float (*x)[4], int y, int z)
+{
+  int a, b, c, d, e, f, g;
+
+  a = 2;
+  b = 2;
+  c = 274;
+  d = 274;
+  if (!z)
+    a = 12;
+  if (!y)
+    b = 12;
+  if (z + 266 >= h - 2)
+    c = 8 + h - z;
+  if (y + 266 >= w - 2)
+    d = 8 + w - y;
+  for (e = a; e < c; e++)
+    for (f = b, g = e * 276 + f; f < d; f++, g++)
+      {
+	float (*h)[4] = x + (g - 277);
+	float k = (*h)[0];
+	float l = (*h)[1];
+	float m = (*h)[2];
+	h++;
+	k += (*h)[0];
+	l += (*h)[1];
+	m += (*h)[2];
+	h++;
+	k += (*h)[0];
+	l += (*h)[1];
+	m += (*h)[2];
+	h += 274;
+	k += (*h)[0];
+	l += (*h)[1];
+	m += (*h)[2];
+	h += 2;
+	k += (*h)[0];
+	l += (*h)[1];
+	m += (*h)[2];
+	h += 274;
+	k += (*h)[0];
+	l += (*h)[1];
+	m += (*h)[2];
+	h++;
+	k += (*h)[0];
+	l += (*h)[1];
+	m += (*h)[2];
+	h++;
+	k += (*h)[0];
+	l += (*h)[1];
+	m += (*h)[2];
+	k *= 0.125f;
+	l *= 0.125f;
+	m *= 0.125f;
+	k = k + (x[g][1] - l);
+	m = m + (x[g][1] - l);
+	x[g][0] = k;
+	x[g][2] = m;
+      }
+}