re PR middle-end/24049 (compiler error: Segmentation fault In function 'DESX_CBCUpdate')

        PR 24049
        * passes.c (init_optimization_passes): Move pass_lower_vector_ssa
        under pass_vectorize.  Clear TODO_ggc_collect from the dce pass
        under pass_vectorize.

From-SVN: r105029

gcc/ChangeLog

+2005-10-06  Richard Henderson  <rth@redhat.com>
+
+	PR 24049
+	* passes.c (init_optimization_passes): Move pass_lower_vector_ssa
+	under pass_vectorize.  Clear TODO_ggc_collect from the dce pass
+	under pass_vectorize.
+
 2005-10-05  Devang Patel  <dpatel@apple.com>
 
 	PR Debug/23205

gcc/passes.c

@@ -588,14 +588,19 @@ init_optimization_passes (void)
   /* NEXT_PASS (pass_may_alias) cannot be done again because the
      vectorizer creates alias relations that are not supported by
      pass_may_alias.  */
-  NEXT_PASS (pass_lower_vector_ssa);
   NEXT_PASS (pass_complete_unroll);
   NEXT_PASS (pass_iv_optimize);
   NEXT_PASS (pass_tree_loop_done);
   *p = NULL;
 
   p = &pass_vectorize.sub;
+  NEXT_PASS (pass_lower_vector_ssa);
+  /* ??? The loop optimizers are not GC safe.  See PR 21805.
+     Turn off GC while registering this pass.  */
+  pass_dce.todo_flags_finish &= ~TODO_ggc_collect;
   NEXT_PASS (pass_dce);
+  pass_dce.todo_flags_finish |= TODO_ggc_collect;
+  gcc_assert (p != &pass_dce.next);
   *p = NULL;
 
   p = &pass_loop2.sub;

gcc/testsuite/gcc.dg/vect/pr24049.c

+/* { dg-do compile } */
+/* { dg-options "-O1 -ftree-vectorize --param ggc-min-heapsize=0 --param ggc-min-expand=0" } */
+
+int DES_CBCUpdate(unsigned char * output, int len)
+{
+  int work[2];
+  unsigned int i;
+  for(i = 0;i < len/8;i++)
+    unscrunch (&output[8*i], work);
+}