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tree.h (tree_memory_tag): Add old_used_alone.

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2006-04-08  Daniel Berlin  <dberlin@dberlin.org>

	* tree.h (tree_memory_tag): Add old_used_alone.
	(SMT_OLD_USED_ALONE): New macro.
	* tree-ssa-alias.c (recalculate_used_alone): Stop
	marking things for renaming unnecessarily.

From-SVN: r112789
This commit is contained in:
Daniel Berlin 2006-04-08 21:50:04 +00:00 committed by Daniel Berlin
parent e0f931d27f
commit 9ccfe0cda4
3 changed files with 22 additions and 2 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2006-04-08 Daniel Berlin <dberlin@dberlin.org>
* tree.h (tree_memory_tag): Add old_used_alone.
(SMT_OLD_USED_ALONE): New macro.
* tree-ssa-alias.c (recalculate_used_alone): Stop
marking things for renaming unnecessarily.
2006-04-08 Kazu Hirata <kazu@codesourcery.com>
* builtins.c, config/arm/arm.c, config/i386/cygwin.h,

11
gcc/tree-ssa-alias.c
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@ -443,7 +443,10 @@ recalculate_used_alone (void)
updating_used_alone = true;
FOR_EACH_REFERENCED_VAR (var, rvi)
if (TREE_CODE (var) == SYMBOL_MEMORY_TAG)
SMT_USED_ALONE (var) = 0;
{
SMT_OLD_USED_ALONE (var) = SMT_USED_ALONE (var);
SMT_USED_ALONE (var) = 0;
}
/* Walk all the statements.
Calls get put into a list of statements to update, since we will
@ -476,7 +479,11 @@ recalculate_used_alone (void)
if (!SMT_USED_ALONE (svar))
{
SMT_USED_ALONE (svar) = true;
mark_sym_for_renaming (svar);
/* Only need to mark for renaming if it wasn't
used alone before. */
if (!SMT_OLD_USED_ALONE (svar))
mark_sym_for_renaming (svar);
}
}
}

6
gcc/tree.h
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@ -2312,6 +2312,7 @@ struct tree_memory_tag GTY(())
struct tree_decl_minimal common;
unsigned int is_global:1;
unsigned int is_used_alone:1;
unsigned int old_used_alone:1;
};
#define MTAG_GLOBAL(NODE) (TREE_MEMORY_TAG_CHECK (NODE)->mtag.is_global)
@ -2321,6 +2322,11 @@ struct tree_memory_tag GTY(())
from it. */
#define SMT_USED_ALONE(NODE) (SYMBOL_MEMORY_TAG_CHECK (NODE)->mtag.is_used_alone)
/* This flag is used to temporarily store the old value of the used alone
flag when updating so we know whether to mark the symbol for
renaming. */
#define SMT_OLD_USED_ALONE(NODE) (SYMBOL_MEMORY_TAG_CHECK (NODE)->mtag.old_used_alone)
struct tree_struct_field_tag GTY(())
{
struct tree_memory_tag common;