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re PR bootstrap/53466 (Bootstrap failure) 

2012-05-24  Richard Guenther  <rguenther@suse.de>

	PR bootstrap/53466
	* tree-ssa-live.c (remove_unused_scope_block_p): Properly
	handle globals.
	(remove_unused_locals): Pass global_unused_vars to
	remove_unused_scope_block_p.  Restore code walking all
	referenced vars and pruning them.

From-SVN: r187824
This commit is contained in:
Richard Guenther 2012-05-24 09:54:25 +00:00 committed by Richard Biener
parent 07250f0e28
commit 1431ce0161
2 changed files with 26 additions and 4 deletions
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9
gcc/ChangeLog
View File

@ -1,3 +1,12 @@
2012-05-24 Richard Guenther <rguenther@suse.de>
PR bootstrap/53466
* tree-ssa-live.c (remove_unused_scope_block_p): Properly
handle globals.
(remove_unused_locals): Pass global_unused_vars to
remove_unused_scope_block_p. Restore code walking all
referenced vars and pruning them.
2012-05-23 Jan Hubicka <jh@suse.cz>
* tree.h (alias_diag_flags): Remove.

21
gcc/tree-ssa-live.c
View File

@ -429,7 +429,7 @@ mark_scope_block_unused (tree scope)
done by the inliner. */
static bool
remove_unused_scope_block_p (tree scope)
remove_unused_scope_block_p (tree scope, bitmap global_unused_vars)
{
tree *t, *next;
bool unused = !TREE_USED (scope);
@ -472,7 +472,9 @@ remove_unused_scope_block_p (tree scope)
info about optimized-out variables in the scope blocks.
Exception are the scope blocks not containing any instructions
at all so user can't get into the scopes at first place. */
else if (var_ann (*t) != NULL && is_used_p (*t))
else if ((is_global_var (*t)
&& !bitmap_bit_p (global_unused_vars, DECL_UID (*t)))
|| (var_ann (*t) != NULL && is_used_p (*t)))
unused = false;
else if (TREE_CODE (*t) == LABEL_DECL && TREE_USED (*t))
/* For labels that are still used in the IL, the decision to
@ -517,7 +519,7 @@ remove_unused_scope_block_p (tree scope)
}
for (t = &BLOCK_SUBBLOCKS (scope); *t ;)
if (remove_unused_scope_block_p (*t))
if (remove_unused_scope_block_p (*t, global_unused_vars))
{
if (BLOCK_SUBBLOCKS (*t))
{
@ -847,9 +849,20 @@ remove_unused_locals (void)
}
if (dstidx != num)
VEC_truncate (tree, cfun->local_decls, dstidx);
/* ??? We end up with decls in referenced-vars that are not in
local-decls. */
FOR_EACH_REFERENCED_VAR (cfun, t, rvi)
if (TREE_CODE (t) == VAR_DECL
&& !VAR_DECL_IS_VIRTUAL_OPERAND (t)
&& !is_used_p (t))
remove_referenced_var (t);
remove_unused_scope_block_p (DECL_INITIAL (current_function_decl),
global_unused_vars);
BITMAP_FREE (global_unused_vars);
remove_unused_scope_block_p (DECL_INITIAL (current_function_decl));
if (dump_file && (dump_flags & TDF_DETAILS))
{
fprintf (dump_file, "Scope blocks after cleanups:\n");