Commit 14cd91f9 by Richard Guenther Committed by Richard Biener

tree-ssa-alias.h (struct ao_ref_s): Add volatile_p field.

2011-12-05  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-alias.h (struct ao_ref_s): Add volatile_p field.
	* tree-ssa-alias.c (ao_ref_init): Initialize it.
	(ao_ref_init_from_ptr_and_size): Likewise.
	(refs_may_alias_p_1): Two volatile accesses conflict.
	(ref_maybe_used_by_call_p_1): Likewise.
	(call_may_clobber_ref_p_1): Likewise.
	* tree-ssa-sccvn.c (ao_ref_init_from_vn_reference): Initialize
	volatile_p field.

From-SVN: r182009
parent 68872bed
2011-12-05 Richard Guenther <rguenther@suse.de>
* tree-ssa-alias.h (struct ao_ref_s): Add volatile_p field.
* tree-ssa-alias.c (ao_ref_init): Initialize it.
(ao_ref_init_from_ptr_and_size): Likewise.
(refs_may_alias_p_1): Two volatile accesses conflict.
(ref_maybe_used_by_call_p_1): Likewise.
(call_may_clobber_ref_p_1): Likewise.
* tree-ssa-sccvn.c (ao_ref_init_from_vn_reference): Initialize
volatile_p field.
2011-12-05 Richard Guenther <rguenther@suse.de>
* tree-ssa.c (verify_ssa): Verify SSA names in the loop
over all SSA names. Remove SSA operand checking, call
verify_ssa_operands.
......@@ -456,6 +456,7 @@ ao_ref_init (ao_ref *r, tree ref)
r->max_size = -1;
r->ref_alias_set = -1;
r->base_alias_set = -1;
r->volatile_p = ref ? TREE_THIS_VOLATILE (ref) : false;
}
/* Returns the base object of the memory reference *REF. */
......@@ -525,6 +526,7 @@ ao_ref_init_from_ptr_and_size (ao_ref *ref, tree ptr, tree size)
ref->max_size = ref->size = -1;
ref->ref_alias_set = 0;
ref->base_alias_set = 0;
ref->volatile_p = false;
}
/* Return 1 if TYPE1 and TYPE2 are to be considered equivalent for the
......@@ -1021,6 +1023,11 @@ refs_may_alias_p_1 (ao_ref *ref1, ao_ref *ref2, bool tbaa_p)
|| TREE_CODE (base2) == LABEL_DECL)
return true;
/* Two volatile accesses always conflict. */
if (ref1->volatile_p
&& ref2->volatile_p)
return true;
/* Defer to simple offset based disambiguation if we have
references based on two decls. Do this before defering to
TBAA to handle must-alias cases in conformance with the
......@@ -1144,6 +1151,11 @@ ref_maybe_used_by_call_p_1 (gimple call, ao_ref *ref)
if (!base)
return true;
/* A call that is not without side-effects might involve volatile
accesses and thus conflicts with all other volatile accesses. */
if (ref->volatile_p)
return true;
/* If the reference is based on a decl that is not aliased the call
cannot possibly use it. */
if (DECL_P (base)
......@@ -1477,6 +1489,11 @@ call_may_clobber_ref_p_1 (gimple call, ao_ref *ref)
|| CONSTANT_CLASS_P (base))
return false;
/* A call that is not without side-effects might involve volatile
accesses and thus conflicts with all other volatile accesses. */
if (ref->volatile_p)
return true;
/* If the reference is based on a decl that is not aliased the call
cannot possibly clobber it. */
if (DECL_P (base)
......
......@@ -86,6 +86,9 @@ typedef struct ao_ref_s
/* The alias set of the base object or -1 if not yet computed. */
alias_set_type base_alias_set;
/* Whether the memory is considered a volatile access. */
bool volatile_p;
} ao_ref;
......
......@@ -918,6 +918,8 @@ ao_ref_init_from_vn_reference (ao_ref *ref,
ref->base_alias_set = base_alias_set;
else
ref->base_alias_set = get_alias_set (base);
/* We discount volatiles from value-numbering elsewhere. */
ref->volatile_p = false;
return true;
}
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment