dr_analyze_indices (struct data_reference *dr, loop_p nest, loop_p loop)
{
VEC (tree, heap) *access_fns = NULL;
- tree ref, *aref, op;
+ tree ref, op;
tree base, off, access_fn;
basic_block before_loop;
return;
}
- ref = unshare_expr (DR_REF (dr));
+ ref = DR_REF (dr);
before_loop = block_before_loop (nest);
/* REALPART_EXPR and IMAGPART_EXPR can be handled like accesses
}
/* Analyze access functions of dimensions we know to be independent. */
- aref = &ref;
- while (handled_component_p (*aref))
+ while (handled_component_p (ref))
{
- if (TREE_CODE (*aref) == ARRAY_REF)
+ if (TREE_CODE (ref) == ARRAY_REF)
{
- op = TREE_OPERAND (*aref, 1);
+ op = TREE_OPERAND (ref, 1);
access_fn = analyze_scalar_evolution (loop, op);
access_fn = instantiate_scev (before_loop, loop, access_fn);
VEC_safe_push (tree, heap, access_fns, access_fn);
- /* For ARRAY_REFs the base is the reference with the index replaced
- by zero if we can not strip it as the outermost component. */
- if (*aref == ref)
- {
- *aref = TREE_OPERAND (*aref, 0);
- continue;
- }
- else
- TREE_OPERAND (*aref, 1) = build_int_cst (TREE_TYPE (op), 0);
}
+ else if (TREE_CODE (ref) == COMPONENT_REF
+ && TREE_CODE (TREE_TYPE (TREE_OPERAND (ref, 0))) == RECORD_TYPE)
+ {
+ /* For COMPONENT_REFs of records (but not unions!) use the
+ FIELD_DECL offset as constant access function so we can
+ disambiguate a[i].f1 and a[i].f2. */
+ tree off = component_ref_field_offset (ref);
+ off = size_binop (PLUS_EXPR,
+ size_binop (MULT_EXPR,
+ fold_convert (bitsizetype, off),
+ bitsize_int (BITS_PER_UNIT)),
+ DECL_FIELD_BIT_OFFSET (TREE_OPERAND (ref, 1)));
+ VEC_safe_push (tree, heap, access_fns, off);
+ }
+ else
+ /* If we have an unhandled component we could not translate
+ to an access function stop analyzing. We have determined
+ our base object in this case. */
+ break;
- aref = &TREE_OPERAND (*aref, 0);
+ ref = TREE_OPERAND (ref, 0);
}
/* If the address operand of a MEM_REF base has an evolution in the
analyzed nest, add it as an additional independent access-function. */
- if (TREE_CODE (*aref) == MEM_REF)
+ if (TREE_CODE (ref) == MEM_REF)
{
- op = TREE_OPERAND (*aref, 0);
+ op = TREE_OPERAND (ref, 0);
access_fn = analyze_scalar_evolution (loop, op);
access_fn = instantiate_scev (before_loop, 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);
STRIP_USELESS_TYPE_CONVERSION (base);
split_constant_offset (base, &base, &off);
/* Fold the MEM_REF offset into the evolutions initial
value to make more bases comparable. */
- if (!integer_zerop (TREE_OPERAND (*aref, 1)))
+ if (!integer_zerop (memoff))
{
off = size_binop (PLUS_EXPR, off,
- fold_convert (ssizetype,
- TREE_OPERAND (*aref, 1)));
- TREE_OPERAND (*aref, 1)
- = build_int_cst (TREE_TYPE (TREE_OPERAND (*aref, 1)), 0);
+ fold_convert (ssizetype, memoff));
+ memoff = build_int_cst (TREE_TYPE (memoff), 0);
}
access_fn = chrec_replace_initial_condition
(access_fn, fold_convert (orig_type, off));
- *aref = fold_build2_loc (EXPR_LOCATION (*aref),
- MEM_REF, TREE_TYPE (*aref),
- base, TREE_OPERAND (*aref, 1));
+ /* ??? This is still not a suitable base object for
+ dr_may_alias_p - the base object needs to be an
+ access that covers the object as whole. With
+ an evolution in the pointer this cannot be
+ guaranteed.
+ As a band-aid, mark the access so we can special-case
+ it in dr_may_alias_p. */
+ ref = fold_build2_loc (EXPR_LOCATION (ref),
+ MEM_REF, TREE_TYPE (ref),
+ base, memoff);
+ DR_UNCONSTRAINED_BASE (dr) = true;
VEC_safe_push (tree, heap, access_fns, access_fn);
}
}
+ else if (DECL_P (ref))
+ {
+ /* Canonicalize DR_BASE_OBJECT to MEM_REF form. */
+ ref = build2 (MEM_REF, TREE_TYPE (ref),
+ build_fold_addr_expr (ref),
+ build_int_cst (reference_alias_ptr_type (ref), 0));
+ }
DR_BASE_OBJECT (dr) = ref;
DR_ACCESS_FNS (dr) = access_fns;
return false;
}
+ /* If we had an evolution in a MEM_REF BASE_OBJECT we do not know
+ the size of the base-object. So we cannot do any offset/overlap
+ based analysis but have to rely on points-to information only. */
+ if (TREE_CODE (addr_a) == MEM_REF
+ && DR_UNCONSTRAINED_BASE (a))
+ {
+ if (TREE_CODE (addr_b) == MEM_REF
+ && DR_UNCONSTRAINED_BASE (b))
+ return ptr_derefs_may_alias_p (TREE_OPERAND (addr_a, 0),
+ TREE_OPERAND (addr_b, 0));
+ else
+ return ptr_derefs_may_alias_p (TREE_OPERAND (addr_a, 0),
+ build_fold_addr_expr (addr_b));
+ }
+ else if (TREE_CODE (addr_b) == MEM_REF
+ && DR_UNCONSTRAINED_BASE (b))
+ return ptr_derefs_may_alias_p (build_fold_addr_expr (addr_a),
+ TREE_OPERAND (addr_b, 0));
+
+ /* Otherwise DR_BASE_OBJECT is an access that covers the whole object
+ that is being subsetted in the loop nest. */
if (DR_IS_WRITE (a) && DR_IS_WRITE (b))
return refs_output_dependent_p (addr_a, addr_b);
else if (DR_IS_READ (a) && DR_IS_WRITE (b))
if (dump_file && (dump_flags & TDF_DETAILS))
{
fprintf (dump_file, "(compute_affine_dependence\n");
- fprintf (dump_file, " (stmt_a = \n");
- print_gimple_stmt (dump_file, DR_STMT (dra), 0, 0);
- fprintf (dump_file, ")\n (stmt_b = \n");
- print_gimple_stmt (dump_file, DR_STMT (drb), 0, 0);
- fprintf (dump_file, ")\n");
+ fprintf (dump_file, " stmt_a: ");
+ print_gimple_stmt (dump_file, DR_STMT (dra), 0, TDF_SLIM);
+ fprintf (dump_file, " stmt_b: ");
+ print_gimple_stmt (dump_file, DR_STMT (drb), 0, TDF_SLIM);
}
/* Analyze only when the dependence relation is not yet known. */
}
if (dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file, ")\n");
+ {
+ if (DDR_ARE_DEPENDENT (ddr) == chrec_known)
+ fprintf (dump_file, ") -> no dependence\n");
+ else if (DDR_ARE_DEPENDENT (ddr) == chrec_dont_know)
+ fprintf (dump_file, ") -> dependence analysis failed\n");
+ else
+ fprintf (dump_file, ")\n");
+ }
}
/* Compute in DEPENDENCE_RELATIONS the data dependence graph for all
};
/* Describes the evolutions of indices of the memory reference. The indices
- are indices of the ARRAY_REFs and the operands of INDIRECT_REFs.
- For ARRAY_REFs, BASE_OBJECT is the reference with zeroed indices
- (note that this reference does not have to be valid, if zero does not
- belong to the range of the array; hence it is not recommended to use
- BASE_OBJECT in any code generation). For INDIRECT_REFs, the address is
- set to the loop-invariant part of the address of the object, except for
- the constant offset. For the examples above,
-
- base_object: a[0].b[0][0] *(p + x + 4B * j_0)
+ are indices of the ARRAY_REFs, indexes in artificial dimensions
+ added for member selection of records and the operands of MEM_REFs.
+ BASE_OBJECT is the part of the reference that is loop-invariant
+ (note that this reference does not have to cover the whole object
+ being accessed, in which case UNCONSTRAINED_BASE is set; hence it is
+ not recommended to use BASE_OBJECT in any code generation).
+ For the examples above,
+
+ base_object: a *(p + x + 4B * j_0)
indices: {j_0, +, 1}_2 {16, +, 4}_2
+ 4
{i_0, +, 1}_1
{j_0, +, 1}_2
*/
/* A list of chrecs. Access functions of the indices. */
VEC(tree,heap) *access_fns;
+
+ /* Whether BASE_OBJECT is an access representing the whole object
+ or whether the access could not be constrained. */
+ bool unconstrained_base;
};
struct dr_alias
{
/* The alias information that should be used for new pointers to this
- location. SYMBOL_TAG is either a DECL or a SYMBOL_MEMORY_TAG. */
+ location. */
struct ptr_info_def *ptr_info;
-
- /* The set of virtual operands corresponding to this memory reference,
- serving as a description of the alias information for the memory
- reference. This could be eliminated if we had alias oracle. */
- bitmap vops;
};
/* An integer vector. A vector formally consists of an element of a vector
#define DR_STMT(DR) (DR)->stmt
#define DR_REF(DR) (DR)->ref
#define DR_BASE_OBJECT(DR) (DR)->indices.base_object
+#define DR_UNCONSTRAINED_BASE(DR) (DR)->indices.unconstrained_base
#define DR_ACCESS_FNS(DR) (DR)->indices.access_fns
#define DR_ACCESS_FN(DR, I) VEC_index (tree, DR_ACCESS_FNS (DR), I)
#define DR_NUM_DIMENSIONS(DR) VEC_length (tree, DR_ACCESS_FNS (DR))
projects / platform / upstream / linaro-gcc.git / commitdiff