[PATCH] Remove duplicate DFS walks from DF init

[PATCH] Remove duplicate DFS walks from DF init

[Richard Biener]

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.

Bootstrapped and tested on x86_64-unknown-linux-gnu for all languages,
pushed.

	* df-core.cc (rest_of_handle_df_initialize): Remove
	computation of df->postorder, df->postorder_inverted and
	df->n_blocks.
---
 gcc/df-core.cc | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/gcc/df-core.cc b/gcc/df-core.cc
index 3286ffda2ce..de5cbd0c622 100644
--- 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 ();
-- 
2.35.3