diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 0545a5cdd7c..256721ff68a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2009-11-18  Alexandre Oliva  <aoliva@redhat.com>
+
+	PR debug/41926
+	* tree-vect-loop.c (vect_loop_kill_debug_uses): New.
+	(vect_transform_loop): Call it.
+
 2009-11-18  Alexandre Oliva  <aoliva@redhat.com>
 
 	* tree-ssa.c (insert_debug_temp_for_var_def): Fix handling of
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 0cbfda25625..3ebf59bbc6a 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2009-11-18  Alexandre Oliva  <aoliva@redhat.com>
+
+	PR debug/41926
+	* gcc.dg/vect/vect-debug-pr41926.c: New.
+
 2009-11-17  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/42058
diff --git a/gcc/testsuite/gcc.dg/vect/vect-debug-pr41926.c b/gcc/testsuite/gcc.dg/vect/vect-debug-pr41926.c
new file mode 100644
index 00000000000..6eea84ae129
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/vect-debug-pr41926.c
@@ -0,0 +1,20 @@
+/* PR debug/41926 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -g -ffast-math -funroll-loops -ftree-vectorize -msse2" { target { i?86-*-* x86_64-*-* } } } */
+
+void
+foo (double (*__restrict p)[4], double (*__restrict q)[4],
+     double *__restrict prim, double scale, double pp, double pq)
+{
+  int md, mc, mb, ma, p_index = 0;
+
+  for (md = 0; md < 1; md++)
+    for (mc = 0; mc < 1; mc++)
+      for (mb = 0; mb < 1; mb++)
+	for (ma = 0; ma < 4; ma++)
+	  {
+	    double tmp = scale * prim[p_index++];
+	    p[md][ma] = p[md][ma] - tmp * pp;
+	    q[mc][ma] = q[mc][ma] - tmp * pq;
+	  }
+}
diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c
index c23577034b1..55b9fb2bf99 100644
--- a/gcc/tree-vect-loop.c
+++ b/gcc/tree-vect-loop.c
@@ -4112,6 +4112,44 @@ vectorizable_live_operation (gimple stmt,
   return true;
 }
 
+/* Kill any debug uses outside LOOP of SSA names defined in STMT.  */
+
+static void
+vect_loop_kill_debug_uses (struct loop *loop, gimple stmt)
+{
+  ssa_op_iter op_iter;
+  imm_use_iterator imm_iter;
+  def_operand_p def_p;
+  gimple ustmt;
+
+  FOR_EACH_PHI_OR_STMT_DEF (def_p, stmt, op_iter, SSA_OP_DEF)
+    {
+      FOR_EACH_IMM_USE_STMT (ustmt, imm_iter, DEF_FROM_PTR (def_p))
+	{
+	  basic_block bb;
+
+	  if (!is_gimple_debug (ustmt))
+	    continue;
+
+	  bb = gimple_bb (ustmt);
+
+	  if (!flow_bb_inside_loop_p (loop, bb))
+	    {
+	      if (gimple_debug_bind_p (ustmt))
+		{
+		  if (vect_print_dump_info (REPORT_DETAILS))
+		    fprintf (vect_dump, "killing debug use");
+
+		  gimple_debug_bind_reset_value (ustmt);
+		  update_stmt (ustmt);
+		}
+	      else
+		gcc_unreachable ();
+	    }
+	}
+    }
+}
+
 /* Function vect_transform_loop.
 
    The analysis phase has determined that the loop is vectorizable.
@@ -4202,7 +4240,11 @@ vect_transform_loop (loop_vec_info loop_vinfo)
 
 	  if (!STMT_VINFO_RELEVANT_P (stmt_info)
 	      && !STMT_VINFO_LIVE_P (stmt_info))
-	    continue;
+	    {
+	      if (MAY_HAVE_DEBUG_STMTS)
+		vect_loop_kill_debug_uses (loop, phi);
+	      continue;
+	    }
 
 	  if ((TYPE_VECTOR_SUBPARTS (STMT_VINFO_VECTYPE (stmt_info))
 	        != (unsigned HOST_WIDE_INT) vectorization_factor)
@@ -4242,6 +4284,8 @@ vect_transform_loop (loop_vec_info loop_vinfo)
 	  if (!STMT_VINFO_RELEVANT_P (stmt_info)
 	      && !STMT_VINFO_LIVE_P (stmt_info))
 	    {
+	      if (MAY_HAVE_DEBUG_STMTS)
+		vect_loop_kill_debug_uses (loop, stmt);
 	      gsi_next (&si);
 	      continue;
 	    }