procyberian/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

tree-ssa-forwprop.c (forward_propagate_into_cond): Return 2 if we need to schedule cfg_cleanup.

Browse source 
2007-06-06  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-forwprop.c (forward_propagate_into_cond): Return 2
	if we need to schedule cfg_cleanup.
	(tree_ssa_forward_propagate_single_use_vars): Do so.

From-SVN: r125490
This commit is contained in:
Richard Biener 2007-06-06 13:58:41 +00:00
parent 5a59ef3687
commit 68c834d087
2 changed files with 22 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
gcc/ChangeLog
View file

@ -1,3 +1,9 @@
2007-06-06 Richard Guenther <rguenther@suse.de>
* tree-ssa-forwprop.c (forward_propagate_into_cond): Return 2
if we need to schedule cfg_cleanup.
(tree_ssa_forward_propagate_single_use_vars): Do so.
2007-06-06 Ian Lance Taylor <iant@google.com>
* fold-const.c (merge_ranges): If range_successor or
@ -247,7 +253,7 @@
PR target/31733
* cfgrtl.c (rtl_verify_flow_info): Skip notes when looking for barrier.
2007-05-31 Jan Hubicka <jh@suse.cz>
2007-06-04 Jan Hubicka <jh@suse.cz>
* tree-predcom.c (replace_ref_with, initialize_root_vars_lm,
reassociate_to_the_same_stmt): Call build_gimple_modify_stmt

21
gcc/tree-ssa-forwprop.c
View file

@ -370,12 +370,14 @@ combine_cond_expr_cond (enum tree_code code, tree type,
}
/* Propagate from the ssa name definition statements of COND_EXPR
in statement STMT into the conditional if that simplifies it. */
in statement STMT into the conditional if that simplifies it.
Returns zero if no statement was changed, one if there were
changes and two if cfg_cleanup needs to run. */
static bool
static int
forward_propagate_into_cond (tree cond_expr, tree stmt)
{
bool did_something = false;
int did_something = 0;
do {
tree tmp = NULL_TREE;
@ -449,7 +451,10 @@ forward_propagate_into_cond (tree cond_expr, tree stmt)
/* Remove defining statements. */
remove_prop_source_from_use (name, NULL);
did_something = true;
if (is_gimple_min_invariant (tmp))
did_something = 2;
else if (did_something == 0)
did_something = 1;
/* Continue combining. */
continue;
@ -1014,9 +1019,11 @@ tree_ssa_forward_propagate_single_use_vars (void)
}
else if (TREE_CODE (rhs) == COND_EXPR)
{
bool did_something;
int did_something;
fold_defer_overflow_warnings ();
did_something = forward_propagate_into_cond (rhs, stmt);
if (did_something == 2)
cfg_changed = true;
fold_undefer_overflow_warnings (!TREE_NO_WARNING (rhs)
&& did_something, stmt, WARN_STRICT_OVERFLOW_CONDITIONAL);
bsi_next (&bsi);
@ -1042,9 +1049,11 @@ tree_ssa_forward_propagate_single_use_vars (void)
}
else if (TREE_CODE (stmt) == COND_EXPR)
{
bool did_something;
int did_something;
fold_defer_overflow_warnings ();
did_something = forward_propagate_into_cond (stmt, stmt);
if (did_something == 2)
cfg_changed = true;
fold_undefer_overflow_warnings (!TREE_NO_WARNING (stmt)
&& did_something, stmt,
WARN_STRICT_OVERFLOW_CONDITIONAL);