From: Richard Biener <rguenther@suse.de>
Date: Mon, 20 Feb 2023 14:02:43 +0000 (+0100)
Subject: Remove duplicate DFS walks from DF init
X-Git-Tag: basepoints/gcc-15~10032
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=974326fd5199a8ae8482f2a521b1edd449a2fa9e;p=thirdparty%2Fgcc.git

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 3286ffda2ce8..de5cbd0c6229 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 ();