Remove duplicate DFS walks from DF init

The following removes unused CFG order computes from
rest_of_handle_df_initialize.  The CFG orders are computed from df_analyze ().
This also removes code duplication that would have to be kept in sync.

	* df-core.cc (rest_of_handle_df_initialize): Remove
	computation of df->postorder, df->postorder_inverted and
	df->n_blocks.

diff --git a/gcc/df-core.cc b/gcc/df-core.cc
index 3286ffda2ce82f0e0b5a5d5cbcb79fa2c7fad360..de5cbd0c6229835025eb52e6ac6c0ecbee79b4d7 100644 (file)
--- a/gcc/df-core.cc
+++ b/gcc/df-core.cc
@@ -701,11 +701,6 @@ rest_of_handle_df_initialize (void)
   if (optimize > 1)
     df_live_add_problem ();
 
-  df->postorder = XNEWVEC (int, last_basic_block_for_fn (cfun));
-  df->n_blocks = post_order_compute (df->postorder, true, true);
-  inverted_post_order_compute (&df->postorder_inverted);
-  gcc_assert ((unsigned) df->n_blocks == df->postorder_inverted.length ());
-
   df->hard_regs_live_count = XCNEWVEC (unsigned int, FIRST_PSEUDO_REGISTER);
 
   df_hard_reg_init ();