#include "internal-fn.h"
#include "vr-values.h"
#include "range-op.h"
+#include "tree-ssa-loop-ivopts.h"
static struct datadep_stats
{
DR, analyzed in LOOP and instantiated before NEST. */
static void
-dr_analyze_indices (struct data_reference *dr, edge nest, loop_p loop)
+dr_analyze_indices (struct indices *dri, tree ref, edge nest, loop_p loop)
{
- vec<tree> access_fns = vNULL;
- tree ref, op;
- tree base, off, access_fn;
-
/* If analyzing a basic-block there are no indices to analyze
and thus no access functions. */
if (!nest)
{
- DR_BASE_OBJECT (dr) = DR_REF (dr);
- DR_ACCESS_FNS (dr).create (0);
+ dri->base_object = ref;
+ dri->access_fns.create (0);
return;
}
- ref = DR_REF (dr);
+ vec<tree> access_fns = vNULL;
/* REALPART_EXPR and IMAGPART_EXPR can be handled like accesses
into a two element array with a constant index. The base is
{
if (TREE_CODE (ref) == ARRAY_REF)
{
- op = TREE_OPERAND (ref, 1);
- access_fn = analyze_scalar_evolution (loop, op);
+ tree op = TREE_OPERAND (ref, 1);
+ tree access_fn = analyze_scalar_evolution (loop, op);
access_fn = instantiate_scev (nest, loop, access_fn);
access_fns.safe_push (access_fn);
}
analyzed nest, add it as an additional independent access-function. */
if (TREE_CODE (ref) == MEM_REF)
{
- op = TREE_OPERAND (ref, 0);
- access_fn = analyze_scalar_evolution (loop, op);
+ tree op = TREE_OPERAND (ref, 0);
+ tree access_fn = analyze_scalar_evolution (loop, op);
access_fn = instantiate_scev (nest, loop, access_fn);
if (TREE_CODE (access_fn) == POLYNOMIAL_CHREC)
{
- tree orig_type;
tree memoff = TREE_OPERAND (ref, 1);
- base = initial_condition (access_fn);
- orig_type = TREE_TYPE (base);
+ tree base = initial_condition (access_fn);
+ tree orig_type = TREE_TYPE (base);
STRIP_USELESS_TYPE_CONVERSION (base);
+ tree off;
split_constant_offset (base, &base, &off);
STRIP_USELESS_TYPE_CONVERSION (base);
/* Fold the MEM_REF offset into the evolutions initial
base, memoff);
MR_DEPENDENCE_CLIQUE (ref) = MR_DEPENDENCE_CLIQUE (old);
MR_DEPENDENCE_BASE (ref) = MR_DEPENDENCE_BASE (old);
- DR_UNCONSTRAINED_BASE (dr) = true;
+ dri->unconstrained_base = true;
access_fns.safe_push (access_fn);
}
}
build_int_cst (reference_alias_ptr_type (ref), 0));
}
- DR_BASE_OBJECT (dr) = ref;
- DR_ACCESS_FNS (dr) = access_fns;
+ dri->base_object = ref;
+ dri->access_fns = access_fns;
}
/* Extracts the alias analysis information from the memory reference DR. */
free_data_ref (data_reference_p dr)
{
DR_ACCESS_FNS (dr).release ();
+ if (dr->alt_indices.base_object)
+ dr->alt_indices.access_fns.release ();
free (dr);
}
dr_analyze_innermost (&DR_INNERMOST (dr), memref,
nest != NULL ? loop : NULL, stmt);
- dr_analyze_indices (dr, nest, loop);
+ dr_analyze_indices (&dr->indices, DR_REF (dr), nest, loop);
dr_analyze_alias (dr);
if (dump_file && (dump_flags & TDF_DETAILS))
TREE_TYPE (TREE_OPERAND (ref_b, 0)));
}
-/* Initialize a data dependence relation between data accesses A and
- B. NB_LOOPS is the number of loops surrounding the references: the
- size of the classic distance/direction vectors. */
+/* Initialize a data dependence relation RES in LOOP_NEST. USE_ALT_INDICES
+ is true when the main indices of A and B were not comparable so we try again
+ with alternate indices computed on an indirect reference. */
struct data_dependence_relation *
-initialize_data_dependence_relation (struct data_reference *a,
- struct data_reference *b,
- vec<loop_p> loop_nest)
+initialize_data_dependence_relation (struct data_dependence_relation *res,
+ vec<loop_p> loop_nest,
+ bool use_alt_indices)
{
- struct data_dependence_relation *res;
+ struct data_reference *a = DDR_A (res);
+ struct data_reference *b = DDR_B (res);
unsigned int i;
- res = XCNEW (struct data_dependence_relation);
- DDR_A (res) = a;
- DDR_B (res) = b;
- DDR_LOOP_NEST (res).create (0);
- DDR_SUBSCRIPTS (res).create (0);
- DDR_DIR_VECTS (res).create (0);
- DDR_DIST_VECTS (res).create (0);
-
- if (a == NULL || b == NULL)
+ struct indices *indices_a = &a->indices;
+ struct indices *indices_b = &b->indices;
+ if (use_alt_indices)
{
- DDR_ARE_DEPENDENT (res) = chrec_dont_know;
- return res;
+ if (TREE_CODE (DR_REF (a)) != MEM_REF)
+ indices_a = &a->alt_indices;
+ if (TREE_CODE (DR_REF (b)) != MEM_REF)
+ indices_b = &b->alt_indices;
}
-
- /* If the data references do not alias, then they are independent. */
- if (!dr_may_alias_p (a, b, loop_nest.exists () ? loop_nest[0] : NULL))
- {
- DDR_ARE_DEPENDENT (res) = chrec_known;
- return res;
- }
-
- unsigned int num_dimensions_a = DR_NUM_DIMENSIONS (a);
- unsigned int num_dimensions_b = DR_NUM_DIMENSIONS (b);
+ unsigned int num_dimensions_a = indices_a->access_fns.length ();
+ unsigned int num_dimensions_b = indices_b->access_fns.length ();
if (num_dimensions_a == 0 || num_dimensions_b == 0)
{
DDR_ARE_DEPENDENT (res) = chrec_dont_know;
the a and b accesses have a single ARRAY_REF component reference [0]
but have two subscripts. */
- if (DR_UNCONSTRAINED_BASE (a))
+ if (indices_a->unconstrained_base)
num_dimensions_a -= 1;
- if (DR_UNCONSTRAINED_BASE (b))
+ if (indices_b->unconstrained_base)
num_dimensions_b -= 1;
/* These structures describe sequences of component references in
B: [3, 4] (i.e. s.e) */
while (index_a < num_dimensions_a && index_b < num_dimensions_b)
{
+ /* The alternate indices form always has a single dimension
+ with unconstrained base. */
+ gcc_assert (!use_alt_indices);
+
/* REF_A and REF_B must be one of the component access types
allowed by dr_analyze_indices. */
gcc_checking_assert (access_fn_component_p (ref_a));
/* See whether FULL_SEQ ends at the base and whether the two bases
are equal. We do not care about TBAA or alignment info so we can
use OEP_ADDRESS_OF to avoid false negatives. */
- tree base_a = DR_BASE_OBJECT (a);
- tree base_b = DR_BASE_OBJECT (b);
+ tree base_a = indices_a->base_object;
+ tree base_b = indices_b->base_object;
bool same_base_p = (full_seq.start_a + full_seq.length == num_dimensions_a
&& full_seq.start_b + full_seq.length == num_dimensions_b
- && DR_UNCONSTRAINED_BASE (a) == DR_UNCONSTRAINED_BASE (b)
+ && (indices_a->unconstrained_base
+ == indices_b->unconstrained_base)
&& operand_equal_p (base_a, base_b, OEP_ADDRESS_OF)
&& (types_compatible_p (TREE_TYPE (base_a),
TREE_TYPE (base_b))
both lvalues are distinct from the object's declared type. */
if (same_base_p)
{
- if (DR_UNCONSTRAINED_BASE (a))
+ if (indices_a->unconstrained_base)
full_seq.length += 1;
}
else
/* Punt if we didn't find a suitable sequence. */
if (full_seq.length == 0)
{
- DDR_ARE_DEPENDENT (res) = chrec_dont_know;
- return res;
+ if (use_alt_indices
+ || (TREE_CODE (DR_REF (a)) == MEM_REF
+ && TREE_CODE (DR_REF (b)) == MEM_REF)
+ || may_be_nonaddressable_p (DR_REF (a))
+ || may_be_nonaddressable_p (DR_REF (b)))
+ {
+ /* Fully exhausted possibilities. */
+ DDR_ARE_DEPENDENT (res) = chrec_dont_know;
+ return res;
+ }
+
+ /* Try evaluating both DRs as dereferences of pointers. */
+ if (!a->alt_indices.base_object
+ && TREE_CODE (DR_REF (a)) != MEM_REF)
+ {
+ tree alt_ref = build2 (MEM_REF, TREE_TYPE (DR_REF (a)),
+ build1 (ADDR_EXPR, ptr_type_node, DR_REF (a)),
+ build_int_cst
+ (reference_alias_ptr_type (DR_REF (a)), 0));
+ dr_analyze_indices (&a->alt_indices, alt_ref,
+ loop_preheader_edge (loop_nest[0]),
+ loop_containing_stmt (DR_STMT (a)));
+ }
+ if (!b->alt_indices.base_object
+ && TREE_CODE (DR_REF (b)) != MEM_REF)
+ {
+ tree alt_ref = build2 (MEM_REF, TREE_TYPE (DR_REF (b)),
+ build1 (ADDR_EXPR, ptr_type_node, DR_REF (b)),
+ build_int_cst
+ (reference_alias_ptr_type (DR_REF (b)), 0));
+ dr_analyze_indices (&b->alt_indices, alt_ref,
+ loop_preheader_edge (loop_nest[0]),
+ loop_containing_stmt (DR_STMT (b)));
+ }
+ return initialize_data_dependence_relation (res, loop_nest, true);
}
if (!same_base_p)
struct subscript *subscript;
subscript = XNEW (struct subscript);
- SUB_ACCESS_FN (subscript, 0) = DR_ACCESS_FN (a, full_seq.start_a + i);
- SUB_ACCESS_FN (subscript, 1) = DR_ACCESS_FN (b, full_seq.start_b + i);
+ SUB_ACCESS_FN (subscript, 0) = indices_a->access_fns[full_seq.start_a + i];
+ SUB_ACCESS_FN (subscript, 1) = indices_b->access_fns[full_seq.start_b + i];
SUB_CONFLICTS_IN_A (subscript) = conflict_fn_not_known ();
SUB_CONFLICTS_IN_B (subscript) = conflict_fn_not_known ();
SUB_LAST_CONFLICT (subscript) = chrec_dont_know;
return res;
}
+/* Initialize a data dependence relation between data accesses A and
+ B. NB_LOOPS is the number of loops surrounding the references: the
+ size of the classic distance/direction vectors. */
+
+struct data_dependence_relation *
+initialize_data_dependence_relation (struct data_reference *a,
+ struct data_reference *b,
+ vec<loop_p> loop_nest)
+{
+ data_dependence_relation *res = XCNEW (struct data_dependence_relation);
+ DDR_A (res) = a;
+ DDR_B (res) = b;
+ DDR_LOOP_NEST (res).create (0);
+ DDR_SUBSCRIPTS (res).create (0);
+ DDR_DIR_VECTS (res).create (0);
+ DDR_DIST_VECTS (res).create (0);
+
+ if (a == NULL || b == NULL)
+ {
+ DDR_ARE_DEPENDENT (res) = chrec_dont_know;
+ return res;
+ }
+
+ /* If the data references do not alias, then they are independent. */
+ if (!dr_may_alias_p (a, b, loop_nest.exists () ? loop_nest[0] : NULL))
+ {
+ DDR_ARE_DEPENDENT (res) = chrec_known;
+ return res;
+ }
+
+ return initialize_data_dependence_relation (res, loop_nest, false);
+}
+
+
/* Frees memory used by the conflict function F. */
static void
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