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Introduce ssa_defined_default_def_p function (PR tree-optimization/79529). 

2017-02-17  Martin Liska  <mliska@suse.cz>

	PR tree-optimization/79529
	* tree-ssa-loop-unswitch.c (is_maybe_undefined): Use
	ssa_defined_default_def_p to handle cases which are implicitly
	defined.
	* tree-ssa.c (ssa_defined_default_def_p): New function.
	(ssa_undefined_value_p): Use ssa_defined_default_def_p to handle cases
	which are implicitly defined.
	* tree-ssa.h (ssa_defined_default_def_p): Declare.

From-SVN: r245530
This commit is contained in:
Martin Liska 2017-02-17 15:36:08 +01:00 committed by Martin Liska
parent 830afa4b0c
commit c6b0d21d49
4 changed files with 38 additions and 15 deletions
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11
gcc/ChangeLog
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@ -1,3 +1,14 @@
2017-02-17 Martin Liska <mliska@suse.cz>
PR tree-optimization/79529
* tree-ssa-loop-unswitch.c (is_maybe_undefined): Use
ssa_defined_default_def_p to handle cases which are implicitly
defined.
* tree-ssa.c (ssa_defined_default_def_p): New function.
(ssa_undefined_value_p): Use ssa_defined_default_def_p to handle cases
which are implicitly defined.
* tree-ssa.h (ssa_defined_default_def_p): Declare.
2017-02-17 Richard Biener <rguenther@suse.de>
PR middle-end/79576

4
gcc/tree-ssa-loop-unswitch.c
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@ -134,9 +134,7 @@ is_maybe_undefined (const tree name, gimple *stmt, struct loop *loop)
if (ssa_undefined_value_p (t, true))
return true;
/* A PARM_DECL will not have an SSA_NAME_DEF_STMT. Parameters
get their initial value from function entry. */
if (SSA_NAME_VAR (t) && TREE_CODE (SSA_NAME_VAR (t)) == PARM_DECL)
if (ssa_defined_default_def_p (t))
continue;
gimple *def = SSA_NAME_DEF_STMT (t);

36
gcc/tree-ssa.c
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@ -1251,6 +1251,29 @@ tree_ssa_strip_useless_type_conversions (tree exp)
return exp;
}
/* Return true if T, as SSA_NAME, has an implicit default defined value. */
bool
ssa_defined_default_def_p (tree t)
{
tree var = SSA_NAME_VAR (t);
if (!var)
;
/* Parameters get their initial value from the function entry. */
else if (TREE_CODE (var) == PARM_DECL)
return true;
/* When returning by reference the return address is actually a hidden
parameter. */
else if (TREE_CODE (var) == RESULT_DECL && DECL_BY_REFERENCE (var))
return true;
/* Hard register variables get their initial value from the ether. */
else if (VAR_P (var) && DECL_HARD_REGISTER (var))
return true;
return false;
}
/* Return true if T, an SSA_NAME, has an undefined value. PARTIAL is what
should be returned if the value is only partially undefined. */
@ -1259,19 +1282,8 @@ bool
ssa_undefined_value_p (tree t, bool partial)
{
gimple *def_stmt;
tree var = SSA_NAME_VAR (t);
if (!var)
;
/* Parameters get their initial value from the function entry. */
else if (TREE_CODE (var) == PARM_DECL)
return false;
/* When returning by reference the return address is actually a hidden
parameter. */
else if (TREE_CODE (var) == RESULT_DECL && DECL_BY_REFERENCE (var))
return false;
/* Hard register variables get their initial value from the ether. */
else if (VAR_P (var) && DECL_HARD_REGISTER (var))
if (ssa_defined_default_def_p (t))
return false;
/* The value is undefined iff its definition statement is empty. */

2
gcc/tree-ssa.h
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@ -50,6 +50,8 @@ extern void delete_tree_ssa (function *);
extern bool tree_ssa_useless_type_conversion (tree);
extern tree tree_ssa_strip_useless_type_conversions (tree);
extern bool ssa_defined_default_def_p (tree t);
extern bool ssa_undefined_value_p (tree, bool = true);
extern bool gimple_uses_undefined_value_p (gimple *);
extern void execute_update_addresses_taken (void);