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Remove dead code in df-scan.c (PR tree-optimization/90978). 

2019-06-25  Martin Liska  <mliska@suse.cz>

	PR tree-optimization/90978
	* df-scan.c (df_update_entry_block_defs): Remove dead else
	branch.
	(df_update_exit_block_uses): Likewise.

From-SVN: r272651
This commit is contained in:
Martin Liska 2019-06-25 13:50:12 +02:00 committed by Martin Liska
parent e5ce4cbc72
commit adef5d4f4e
2 changed files with 19 additions and 32 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2019-06-25 Martin Liska <mliska@suse.cz>
PR tree-optimization/90978
* df-scan.c (df_update_entry_block_defs): Remove dead else
branch.
(df_update_exit_block_uses): Likewise.
2019-06-25 Kwok Cheung Yeung <kcy@codesourcery.com>
Andrew Stubbs <ams@codesourcery.com>

44
gcc/df-scan.c
View File

@ -3601,23 +3601,13 @@ df_update_entry_block_defs (void)
auto_bitmap refs (&df_bitmap_obstack);
df_get_entry_block_def_set (refs);
if (df->entry_block_defs)
gcc_assert (df->entry_block_defs);
if (!bitmap_equal_p (df->entry_block_defs, refs))
{
if (!bitmap_equal_p (df->entry_block_defs, refs))
{
struct df_scan_bb_info *bb_info = df_scan_get_bb_info (ENTRY_BLOCK);
df_ref_chain_delete_du_chain (bb_info->artificial_defs);
df_ref_chain_delete (bb_info->artificial_defs);
bb_info->artificial_defs = NULL;
changed = true;
}
}
else
{
struct df_scan_problem_data *problem_data
= (struct df_scan_problem_data *) df_scan->problem_data;
gcc_unreachable ();
df->entry_block_defs = BITMAP_ALLOC (&problem_data->reg_bitmaps);
struct df_scan_bb_info *bb_info = df_scan_get_bb_info (ENTRY_BLOCK);
df_ref_chain_delete_du_chain (bb_info->artificial_defs);
df_ref_chain_delete (bb_info->artificial_defs);
bb_info->artificial_defs = NULL;
changed = true;
}
@ -3775,23 +3765,13 @@ df_update_exit_block_uses (void)
auto_bitmap refs (&df_bitmap_obstack);
df_get_exit_block_use_set (refs);
if (df->exit_block_uses)
gcc_assert (df->exit_block_uses);
if (!bitmap_equal_p (df->exit_block_uses, refs))
{
if (!bitmap_equal_p (df->exit_block_uses, refs))
{
struct df_scan_bb_info *bb_info = df_scan_get_bb_info (EXIT_BLOCK);
df_ref_chain_delete_du_chain (bb_info->artificial_uses);
df_ref_chain_delete (bb_info->artificial_uses);
bb_info->artificial_uses = NULL;
changed = true;
}
}
else
{
struct df_scan_problem_data *problem_data
= (struct df_scan_problem_data *) df_scan->problem_data;
gcc_unreachable ();
df->exit_block_uses = BITMAP_ALLOC (&problem_data->reg_bitmaps);
struct df_scan_bb_info *bb_info = df_scan_get_bb_info (EXIT_BLOCK);
df_ref_chain_delete_du_chain (bb_info->artificial_uses);
df_ref_chain_delete (bb_info->artificial_uses);
bb_info->artificial_uses = NULL;
changed = true;
}