OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

tree-ssa-forwprop.c (forward_propagate_into_cond): Keep track if we simplified anything. 

2007-04-27  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-forwprop.c (forward_propagate_into_cond): Keep track
	if we simplified anything.
	(tree_ssa_forward_propagate_single_use_vars): Defer overflow
	warnings until we did a simplification and the stmt was not
	marked as TREE_NO_WARNING.

From-SVN: r124242
This commit is contained in:
Richard Guenther 2007-04-27 21:50:04 +00:00 committed by Richard Biener
parent bfa455647c
commit 113ab41c05
2 changed files with 28 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
2007-04-27 Richard Guenther <rguenther@suse.de>
* tree-ssa-forwprop.c (forward_propagate_into_cond): Keep track
if we simplified anything.
(tree_ssa_forward_propagate_single_use_vars): Defer overflow
warnings until we did a simplification and the stmt was not
marked as TREE_NO_WARNING.
2007-04-27 Mike Stump <mrs@apple.com>
* config/rs6000/darwin.h (ALWAYS_PUSH_CONSTS_USING_REGS_P): Remove.

25
gcc/tree-ssa-forwprop.c
View File

@ -372,9 +372,11 @@ 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. */
static void
static bool
forward_propagate_into_cond (tree cond_expr, tree stmt)
{
bool did_something = false;
do {
tree tmp = NULL_TREE;
tree cond = COND_EXPR_COND (cond_expr);
@ -407,7 +409,7 @@ forward_propagate_into_cond (tree cond_expr, tree stmt)
def_stmt = get_prop_source_stmt (name, false, &single_use_p);
if (def_stmt == NULL_TREE
|| !can_propagate_from (def_stmt))
return;
return did_something;
rhs = GIMPLE_STMT_OPERAND (def_stmt, 1);
tmp = combine_cond_expr_cond (TREE_CODE (cond), boolean_type_node,
@ -422,7 +424,7 @@ forward_propagate_into_cond (tree cond_expr, tree stmt)
def_stmt = get_prop_source_stmt (name, true, NULL);
if (def_stmt == NULL_TREE
|| !can_propagate_from (def_stmt))
return;
return did_something;
rhs = GIMPLE_STMT_OPERAND (def_stmt, 1);
tmp = combine_cond_expr_cond (NE_EXPR, boolean_type_node, rhs,
@ -447,12 +449,16 @@ forward_propagate_into_cond (tree cond_expr, tree stmt)
/* Remove defining statements. */
remove_prop_source_from_use (name, NULL);
did_something = true;
/* Continue combining. */
continue;
}
break;
} while (1);
return did_something;
}
/* We've just substituted an ADDR_EXPR into stmt. Update all the
@ -986,7 +992,11 @@ tree_ssa_forward_propagate_single_use_vars (void)
}
else if (TREE_CODE (rhs) == COND_EXPR)
{
forward_propagate_into_cond (rhs, stmt);
bool did_something;
fold_defer_overflow_warnings ();
did_something = forward_propagate_into_cond (rhs, stmt);
fold_undefer_overflow_warnings (!TREE_NO_WARNING (rhs)
&& did_something, stmt, WARN_STRICT_OVERFLOW_CONDITIONAL);
bsi_next (&bsi);
}
else if (COMPARISON_CLASS_P (rhs))
@ -1010,7 +1020,12 @@ tree_ssa_forward_propagate_single_use_vars (void)
}
else if (TREE_CODE (stmt) == COND_EXPR)
{
forward_propagate_into_cond (stmt, stmt);
bool did_something;
fold_defer_overflow_warnings ();
did_something = forward_propagate_into_cond (stmt, stmt);
fold_undefer_overflow_warnings (!TREE_NO_WARNING (stmt)
&& did_something, stmt,
WARN_STRICT_OVERFLOW_CONDITIONAL);
bsi_next (&bsi);
}
else