#include "tree-scalar-evolution.h"
#include "tree-pass.h"
#include "langhooks.h"
+#include "tree-affine.h"
static struct datadep_stats
{
int punsignedp, pvolatilep;
op0 = TREE_OPERAND (op0, 0);
- if (!handled_component_p (op0))
- return false;
-
base = get_inner_reference (op0, &pbitsize, &pbitpos, &poffset,
&pmode, &punsignedp, &pvolatilep, false);
*off = ssize_int (0);
STRIP_NOPS (exp);
- if (tree_is_chrec (exp))
+ if (tree_is_chrec (exp)
+ || get_gimple_rhs_class (TREE_CODE (exp)) == GIMPLE_TERNARY_RHS)
return;
otype = TREE_TYPE (exp);
}
/* Analyzes the behavior of the memory reference DR in the innermost loop or
- basic block that contains it. Returns true if analysis succeed or false
+ basic block that contains it. Returns true if analysis succeed or false
otherwise. */
bool
-dr_analyze_innermost (struct data_reference *dr)
+dr_analyze_innermost (struct data_reference *dr, struct loop *nest)
{
gimple stmt = DR_STMT (dr);
struct loop *loop = loop_containing_stmt (stmt);
}
else
base = build_fold_addr_expr (base);
+
if (in_loop)
{
if (!simple_iv (loop, loop_containing_stmt (stmt), base, &base_iv,
false))
{
- if (dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file, "failed: evolution of base is not affine.\n");
- return false;
+ if (nest)
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "failed: evolution of base is not"
+ " affine.\n");
+ return false;
+ }
+ else
+ {
+ base_iv.base = base;
+ base_iv.step = ssize_int (0);
+ base_iv.no_overflow = true;
+ }
}
}
else
else if (!simple_iv (loop, loop_containing_stmt (stmt),
poffset, &offset_iv, false))
{
- if (dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file, "failed: evolution of offset is not"
- " affine.\n");
- return false;
+ if (nest)
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "failed: evolution of offset is not"
+ " affine.\n");
+ return false;
+ }
+ else
+ {
+ offset_iv.base = poffset;
+ offset_iv.step = ssize_int (0);
+ }
}
}
dr_analyze_indices (struct data_reference *dr, loop_p nest, loop_p loop)
{
VEC (tree, heap) *access_fns = NULL;
- tree ref = unshare_expr (DR_REF (dr)), aref = ref, op;
- tree base, off, access_fn = NULL_TREE;
- basic_block before_loop = NULL;
+ tree ref, *aref, op;
+ tree base, off, access_fn;
+ basic_block before_loop;
+
+ /* 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) = NULL;
+ return;
+ }
+
+ ref = unshare_expr (DR_REF (dr));
+ before_loop = block_before_loop (nest);
- if (nest)
- before_loop = block_before_loop (nest);
+ /* REALPART_EXPR and IMAGPART_EXPR can be handled like accesses
+ into a two element array with a constant index. The base is
+ then just the immediate underlying object. */
+ if (TREE_CODE (ref) == REALPART_EXPR)
+ {
+ ref = TREE_OPERAND (ref, 0);
+ VEC_safe_push (tree, heap, access_fns, integer_zero_node);
+ }
+ else if (TREE_CODE (ref) == IMAGPART_EXPR)
+ {
+ ref = TREE_OPERAND (ref, 0);
+ VEC_safe_push (tree, heap, access_fns, integer_one_node);
+ }
- while (handled_component_p (aref))
+ /* Analyze access functions of dimensions we know to be independent. */
+ aref = &ref;
+ while (handled_component_p (*aref))
{
- if (TREE_CODE (aref) == ARRAY_REF)
+ if (TREE_CODE (*aref) == ARRAY_REF)
{
- op = TREE_OPERAND (aref, 1);
- if (nest)
+ op = TREE_OPERAND (*aref, 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)
{
- 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);
+ *aref = TREE_OPERAND (*aref, 0);
+ continue;
}
-
- TREE_OPERAND (aref, 1) = build_int_cst (TREE_TYPE (op), 0);
+ else
+ TREE_OPERAND (*aref, 1) = build_int_cst (TREE_TYPE (op), 0);
}
- aref = TREE_OPERAND (aref, 0);
+ aref = &TREE_OPERAND (*aref, 0);
}
- if (nest
- && (INDIRECT_REF_P (aref)
- || TREE_CODE (aref) == MEM_REF))
+ /* 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)
{
- op = TREE_OPERAND (aref, 0);
+ op = TREE_OPERAND (*aref, 0);
access_fn = analyze_scalar_evolution (loop, op);
access_fn = instantiate_scev (before_loop, loop, access_fn);
- base = initial_condition (access_fn);
- split_constant_offset (base, &base, &off);
- if (TREE_CODE (aref) == MEM_REF)
- off = size_binop (PLUS_EXPR, off,
- fold_convert (ssizetype, TREE_OPERAND (aref, 1)));
- access_fn = chrec_replace_initial_condition (access_fn,
- fold_convert (TREE_TYPE (base), off));
-
- TREE_OPERAND (aref, 0) = base;
- VEC_safe_push (tree, heap, access_fns, access_fn);
+ if (TREE_CODE (access_fn) == POLYNOMIAL_CHREC)
+ {
+ tree orig_type;
+ 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)))
+ {
+ 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);
+ }
+ 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));
+ VEC_safe_push (tree, heap, access_fns, access_fn);
+ }
}
- if (TREE_CODE (aref) == MEM_REF)
- TREE_OPERAND (aref, 1)
- = build_int_cst (TREE_TYPE (TREE_OPERAND (aref, 1)), 0);
-
- if (TREE_CODE (ref) == MEM_REF
- && TREE_CODE (TREE_OPERAND (ref, 0)) == ADDR_EXPR
- && integer_zerop (TREE_OPERAND (ref, 1)))
- ref = TREE_OPERAND (TREE_OPERAND (ref, 0), 0);
-
- /* For canonicalization purposes we'd like to strip all outermost
- zero-offset component-refs.
- ??? For now simply handle zero-index array-refs. */
- while (TREE_CODE (ref) == ARRAY_REF
- && integer_zerop (TREE_OPERAND (ref, 1)))
- ref = TREE_OPERAND (ref, 0);
-
DR_BASE_OBJECT (dr) = ref;
DR_ACCESS_FNS (dr) = access_fns;
}
DR_REF (dr) = memref;
DR_IS_READ (dr) = is_read;
- dr_analyze_innermost (dr);
+ dr_analyze_innermost (dr, nest);
dr_analyze_indices (dr, nest, loop);
dr_analyze_alias (dr);
if (dump_file && (dump_flags & TDF_DETAILS))
{
+ unsigned i;
fprintf (dump_file, "\tbase_address: ");
print_generic_expr (dump_file, DR_BASE_ADDRESS (dr), TDF_SLIM);
fprintf (dump_file, "\n\toffset from base address: ");
fprintf (dump_file, "\n\tbase_object: ");
print_generic_expr (dump_file, DR_BASE_OBJECT (dr), TDF_SLIM);
fprintf (dump_file, "\n");
+ for (i = 0; i < DR_NUM_DIMENSIONS (dr); i++)
+ {
+ fprintf (dump_file, "\tAccess function %d: ", i);
+ print_generic_stmt (dump_file, DR_ACCESS_FN (dr, i), TDF_SLIM);
+ }
}
return dr;
}
/* Returns false if we can prove that data references A and B do not alias,
- true otherwise. */
+ true otherwise. If LOOP_NEST is false no cross-iteration aliases are
+ considered. */
bool
-dr_may_alias_p (const struct data_reference *a, const struct data_reference *b)
+dr_may_alias_p (const struct data_reference *a, const struct data_reference *b,
+ bool loop_nest)
{
tree addr_a = DR_BASE_OBJECT (a);
tree addr_b = DR_BASE_OBJECT (b);
+ /* If we are not processing a loop nest but scalar code we
+ do not need to care about possible cross-iteration dependences
+ and thus can process the full original reference. Do so,
+ similar to how loop invariant motion applies extra offset-based
+ disambiguation. */
+ if (!loop_nest)
+ {
+ aff_tree off1, off2;
+ double_int size1, size2;
+ get_inner_reference_aff (DR_REF (a), &off1, &size1);
+ get_inner_reference_aff (DR_REF (b), &off2, &size2);
+ aff_combination_scale (&off1, double_int_minus_one);
+ aff_combination_add (&off2, &off1);
+ if (aff_comb_cannot_overlap_p (&off2, size1, size2))
+ return false;
+ }
+
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))
return refs_may_alias_p (addr_a, addr_b);
}
-static void compute_self_dependence (struct data_dependence_relation *);
-
/* 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. */
-static struct data_dependence_relation *
+struct data_dependence_relation *
initialize_data_dependence_relation (struct data_reference *a,
struct data_reference *b,
VEC (loop_p, heap) *loop_nest)
}
/* If the data references do not alias, then they are independent. */
- if (!dr_may_alias_p (a, b))
+ if (!dr_may_alias_p (a, b, loop_nest != NULL))
{
DDR_ARE_DEPENDENT (res) = chrec_known;
return res;
max_stmt_executions_tree (struct loop *loop)
{
double_int nit;
- tree type;
if (!max_stmt_executions (loop, true, &nit))
return chrec_dont_know;
- type = lang_hooks.types.type_for_size (INT_TYPE_SIZE, true);
- if (!double_int_fits_to_tree_p (type, nit))
+ if (!double_int_fits_to_tree_p (unsigned_type_node, nit))
return chrec_dont_know;
- return double_int_to_tree (type, nit);
+ return double_int_to_tree (unsigned_type_node, nit);
}
/* Analyze a SIV (Single Index Variable) subscript where CHREC_A is a
/* This computes the dependence relation for the same data
reference into DDR. */
-static void
+void
compute_self_dependence (struct data_dependence_relation *ddr)
{
unsigned int i;
DR_STMT (dr) = stmt;
DR_REF (dr) = op0;
- res = dr_analyze_innermost (dr)
+ res = dr_analyze_innermost (dr, loop_containing_stmt (stmt))
&& stride_of_unit_type_p (DR_STEP (dr), TREE_TYPE (op0));
free_data_ref (dr);
DR_STMT (dr) = stmt;
DR_REF (dr) = *ref->pos;
- dr_analyze_innermost (dr);
+ dr_analyze_innermost (dr, loop_containing_stmt (stmt));
base_address = DR_BASE_ADDRESS (dr);
if (!base_address)
OSDN Git Service
