/* The alias set number, as stored in MEM_ALIAS_SET. */
alias_set_type alias_set;
+ /* Nonzero if would have a child of zero: this effectively makes this
+ alias set the same as alias set zero. */
+ int has_zero_child;
+
/* The children of the alias set. These are not just the immediate
children, but, in fact, all descendants. So, if we have:
continuing our example above, the children here will be all of
`int', `double', `float', and `struct S'. */
splay_tree GTY((param1_is (int), param2_is (int))) children;
-
- /* Nonzero if would have a child of zero: this effectively makes this
- alias set the same as alias set zero. */
- int has_zero_child;
};
typedef struct alias_set_entry *alias_set_entry;
static bool nonoverlapping_component_refs_p (const_tree, const_tree);
static tree decl_for_component_ref (tree);
static rtx adjust_offset_for_component_ref (tree, rtx);
-static int nonoverlapping_memrefs_p (const_rtx, const_rtx);
static int write_dependence_p (const_rtx, const_rtx, int);
static void memory_modified_1 (rtx, const_rtx, void *);
/* Otherwise, check if set1 is a subset of set2. */
ase = get_alias_set_entry (set2);
if (ase != 0
- && (splay_tree_lookup (ase->children,
- (splay_tree_key) set1)))
+ && ((ase->has_zero_child && set1 == 0)
+ || splay_tree_lookup (ase->children,
+ (splay_tree_key) set1)))
return true;
return false;
}
/* Check for accesses through restrict-qualified pointers. */
if (INDIRECT_REF_P (inner))
{
- tree decl = find_base_decl (TREE_OPERAND (inner, 0));
+ tree decl;
+
+ if (TREE_CODE (TREE_OPERAND (inner, 0)) == SSA_NAME)
+ decl = SSA_NAME_VAR (TREE_OPERAND (inner, 0));
+ else
+ decl = find_base_decl (TREE_OPERAND (inner, 0));
if (decl && DECL_POINTER_ALIAS_SET_KNOWN_P (decl))
{
return 0;
}
- /* For non-addressable fields we return the alias set of the
- outermost object that could have its address taken. If this
- is an SFT use the precomputed value. */
- if (TREE_CODE (t) == STRUCT_FIELD_TAG
- && SFT_NONADDRESSABLE_P (t))
- return SFT_ALIAS_SET (t);
-
/* Otherwise, pick up the outermost object that we could have a pointer
to, processing conversions as above. */
while (component_uses_parent_alias_set (t))
else if (TREE_CODE (t) == VECTOR_TYPE)
set = get_alias_set (TREE_TYPE (t));
+ /* Unless the language specifies otherwise, treat array types the
+ same as their components. This avoids the asymmetry we get
+ through recording the components. Consider accessing a
+ character(kind=1) through a reference to a character(kind=1)[1:1].
+ Or consider if we want to assign integer(kind=4)[0:D.1387] and
+ integer(kind=4)[4] the same alias set or not.
+ Just be pragmatic here and make sure the array and its element
+ type get the same alias set assigned. */
+ else if (TREE_CODE (t) == ARRAY_TYPE
+ && !TYPE_NONALIASED_COMPONENT (t))
+ set = get_alias_set (TREE_TYPE (t));
+
else
/* Otherwise make a new alias set for this type. */
set = new_alias_set ();
{
/* Create an entry for the SUPERSET, so that we have a place to
attach the SUBSET. */
- superset_entry = ggc_alloc (sizeof (struct alias_set_entry));
+ superset_entry = GGC_NEW (struct alias_set_entry);
superset_entry->alias_set = superset;
superset_entry->children
= splay_tree_new_ggc (splay_tree_compare_ints);
/* Record that component types of TYPE, if any, are part of that type for
aliasing purposes. For record types, we only record component types
- for fields that are marked addressable. For array types, we always
- record the component types, so the front end should not call this
- function if the individual component aren't addressable. */
+ for fields that are not marked non-addressable. For array types, we
+ only record the component type if it is not marked non-aliased. */
void
record_component_aliases (tree type)
switch (TREE_CODE (type))
{
- case ARRAY_TYPE:
- if (! TYPE_NONALIASED_COMPONENT (type))
- record_alias_subset (superset, get_alias_set (TREE_TYPE (type)));
- break;
-
case RECORD_TYPE:
case UNION_TYPE:
case QUAL_UNION_TYPE:
get_alias_set (BINFO_TYPE (base_binfo)));
}
for (field = TYPE_FIELDS (type); field != 0; field = TREE_CHAIN (field))
- if (TREE_CODE (field) == FIELD_DECL && ! DECL_NONADDRESSABLE_P (field))
+ if (TREE_CODE (field) == FIELD_DECL && !DECL_NONADDRESSABLE_P (field))
record_alias_subset (superset, get_alias_set (TREE_TYPE (field)));
break;
record_alias_subset (superset, get_alias_set (TREE_TYPE (type)));
break;
+ /* VECTOR_TYPE and ARRAY_TYPE share the alias set with their
+ element type. */
+
default:
break;
}
return GEN_INT (ioffset);
}
+/* The function returns nonzero if X is an address containg VALUE. */
+static int
+value_addr_p (rtx x)
+{
+ if (GET_CODE (x) == VALUE)
+ return 1;
+ if (GET_CODE (x) == PLUS && GET_CODE (XEXP (x, 0)) == VALUE)
+ return 1;
+ return 0;
+}
+
+/* The function returns nonzero if X is a stack address. */
+static int
+stack_addr_p (rtx x)
+{
+ if (x == hard_frame_pointer_rtx || x == frame_pointer_rtx
+ || x == arg_pointer_rtx || x == stack_pointer_rtx)
+ return 1;
+ if (GET_CODE (x) == PLUS
+ && (XEXP (x, 0) == hard_frame_pointer_rtx
+ || XEXP (x, 0) == frame_pointer_rtx
+ || XEXP (x, 0) == arg_pointer_rtx
+ || XEXP (x, 0) == stack_pointer_rtx)
+ && CONSTANT_P (XEXP (x, 1)))
+ return 1;
+ return 0;
+}
+
/* Return nonzero if we can determine the exprs corresponding to memrefs
X and Y and they do not overlap. */
-static int
+int
nonoverlapping_memrefs_p (const_rtx x, const_rtx y)
{
tree exprx = MEM_EXPR (x), expry = MEM_EXPR (y);
rtx rtlx, rtly;
rtx basex, basey;
+ rtx x_addr, y_addr;
rtx moffsetx, moffsety;
HOST_WIDE_INT offsetx = 0, offsety = 0, sizex, sizey, tem;
+ if (flag_ira && optimize && reload_completed)
+ {
+ /* We need this code for IRA because of stack slot sharing. RTL
+ in decl can be different than RTL used in insns. It is a
+ safe code although it can be conservative sometime. */
+ x_addr = canon_rtx (get_addr (XEXP (x, 0)));
+ y_addr = canon_rtx (get_addr (XEXP (y, 0)));
+
+ if (value_addr_p (x_addr) || value_addr_p (y_addr))
+ return 0;
+
+ if (stack_addr_p (x_addr) && stack_addr_p (y_addr)
+ && memrefs_conflict_p (SIZE_FOR_MODE (y), y_addr,
+ SIZE_FOR_MODE (x), x_addr, 0))
+ return 0;
+ }
+
/* Unless both have exprs, we can't tell anything. */
if (exprx == 0 || expry == 0)
return 0;
timevar_push (TV_ALIAS_ANALYSIS);
reg_known_value_size = maxreg - FIRST_PSEUDO_REGISTER;
- reg_known_value = ggc_calloc (reg_known_value_size, sizeof (rtx));
- reg_known_equiv_p = xcalloc (reg_known_value_size, sizeof (bool));
+ reg_known_value = GGC_CNEWVEC (rtx, reg_known_value_size);
+ reg_known_equiv_p = XCNEWVEC (bool, reg_known_value_size);
/* If we have memory allocated from the previous run, use it. */
if (old_reg_base_value)
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