/* Predictive commoning.
- Copyright (C) 2005, 2007, 2008 Free Software Foundation, Inc.
+ Copyright (C) 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
This file is part of GCC.
/* Data references (or phi nodes that carry data reference values across
loop iterations). */
-typedef struct dref
+typedef struct dref_d
{
/* The reference itself. */
struct data_reference *ref;
comps[ca] = comp;
}
- dataref = XCNEW (struct dref);
+ dataref = XCNEW (struct dref_d);
dataref->ref = dr;
dataref->stmt = DR_STMT (dr);
dataref->offset = double_int_zero;
static void
insert_looparound_copy (chain_p chain, dref ref, gimple phi)
{
- dref nw = XCNEW (struct dref), aref;
+ dref nw = XCNEW (struct dref_d), aref;
unsigned i;
nw->stmt = phi;
else
return NULL_TREE;
- ok = simple_iv (loop, first_stmt (loop->header), idx, &iv, true);
+ ok = simple_iv (loop, loop, idx, &iv, true);
if (!ok)
return NULL_TREE;
iv.base = expand_simple_operations (iv.base);
void
mark_virtual_ops_for_renaming (gimple stmt)
{
- ssa_op_iter iter;
tree var;
if (gimple_code (stmt) == GIMPLE_PHI)
}
update_stmt (stmt);
-
- FOR_EACH_SSA_TREE_OPERAND (var, stmt, iter, SSA_OP_ALL_VIRTUALS)
- {
- if (TREE_CODE (var) == SSA_NAME)
- var = SSA_NAME_VAR (var);
- mark_sym_for_renaming (var);
- }
-}
-
-/* Calls mark_virtual_ops_for_renaming for all members of LIST. */
-
-static void
-mark_virtual_ops_for_renaming_list (gimple_seq list)
-{
- gimple_stmt_iterator gsi;
-
- for (gsi = gsi_start (list); !gsi_end_p (gsi); gsi_next (&gsi))
- mark_virtual_ops_for_renaming (gsi_stmt (gsi));
+ if (gimple_vuse (stmt))
+ mark_sym_for_renaming (gimple_vop (cfun));
}
/* Returns a new temporary variable used for the I-th variable carrying
init = force_gimple_operand (init, &stmts, true, NULL_TREE);
if (stmts)
- {
- mark_virtual_ops_for_renaming_list (stmts);
- gsi_insert_seq_on_edge_immediate (entry, stmts);
- }
+ gsi_insert_seq_on_edge_immediate (entry, stmts);
phi = create_phi_node (var, loop->header);
SSA_NAME_DEF_STMT (var) = phi;
- add_phi_arg (phi, init, entry);
- add_phi_arg (phi, next, latch);
+ add_phi_arg (phi, init, entry, UNKNOWN_LOCATION);
+ add_phi_arg (phi, next, latch, UNKNOWN_LOCATION);
}
}
init = force_gimple_operand (init, &stmts, written, NULL_TREE);
if (stmts)
- {
- mark_virtual_ops_for_renaming_list (stmts);
- gsi_insert_seq_on_edge_immediate (entry, stmts);
- }
+ gsi_insert_seq_on_edge_immediate (entry, stmts);
if (written)
{
next = VEC_index (tree, *vars, 1);
phi = create_phi_node (var, loop->header);
SSA_NAME_DEF_STMT (var) = phi;
- add_phi_arg (phi, init, entry);
- add_phi_arg (phi, next, latch);
+ add_phi_arg (phi, init, entry, UNKNOWN_LOCATION);
+ add_phi_arg (phi, next, latch, UNKNOWN_LOCATION);
}
else
{
execute_pred_commoning (loop, dta->chains, dta->tmp_vars);
}
-/* Returns true if we can and should unroll LOOP FACTOR times. Number
- of iterations of the loop is returned in NITER. */
-
-static bool
-should_unroll_loop_p (struct loop *loop, unsigned factor,
- struct tree_niter_desc *niter)
-{
- edge exit;
-
- if (factor == 1)
- return false;
-
- /* Check whether unrolling is possible. We only want to unroll loops
- for that we are able to determine number of iterations. We also
- want to split the extra iterations of the loop from its end,
- therefore we require that the loop has precisely one
- exit. */
-
- exit = single_dom_exit (loop);
- if (!exit)
- return false;
-
- if (!number_of_iterations_exit (loop, exit, niter, false))
- return false;
-
- /* And of course, we must be able to duplicate the loop. */
- if (!can_duplicate_loop_p (loop))
- return false;
-
- /* The final loop should be small enough. */
- if (tree_num_loop_insns (loop, &eni_size_weights) * factor
- > (unsigned) PARAM_VALUE (PARAM_MAX_UNROLLED_INSNS))
- return false;
-
- return true;
-}
-
/* Base NAME and all the names in the chain of phi nodes that use it
on variable VAR. The phi nodes are recognized by being in the copies of
the header of the LOOP. */
for (i = 0; (VEC_iterate (dref, ch1->refs, i, r1)
&& VEC_iterate (dref, ch2->refs, i, r2)); i++)
{
- nw = XCNEW (struct dref);
+ nw = XCNEW (struct dref_d);
nw->stmt = stmt_combining_refs (r1, r2);
nw->distance = r1->distance;
}
}
-/* Sets alias information based on data reference DR for REF,
- if necessary. */
-
-static void
-set_alias_info (tree ref, struct data_reference *dr)
-{
- tree var;
- tree tag = DR_SYMBOL_TAG (dr);
-
- gcc_assert (tag != NULL_TREE);
-
- ref = get_base_address (ref);
- if (!ref || !INDIRECT_REF_P (ref))
- return;
-
- var = SSA_NAME_VAR (TREE_OPERAND (ref, 0));
- if (var_ann (var)->symbol_mem_tag)
- return;
-
- if (!MTAG_P (tag))
- new_type_alias (var, tag, ref);
- else
- var_ann (var)->symbol_mem_tag = tag;
-}
-
/* Prepare initializers for CHAIN in LOOP. Returns false if this is
impossible because one of these initializers may trap, true otherwise. */
init = force_gimple_operand (init, &stmts, false, NULL_TREE);
if (stmts)
- {
- mark_virtual_ops_for_renaming_list (stmts);
- gsi_insert_seq_on_edge_immediate (entry, stmts);
- }
- set_alias_info (init, dr);
+ gsi_insert_seq_on_edge_immediate (entry, stmts);
VEC_replace (tree, chain->inits, i, init);
}
that its number of iterations is divisible by the factor. */
unroll_factor = determine_unroll_factor (chains);
scev_reset ();
- unroll = should_unroll_loop_p (loop, unroll_factor, &desc);
+ unroll = (unroll_factor > 1
+ && can_unroll_loop_p (loop, unroll_factor, &desc));
exit = single_dom_exit (loop);
/* Execute the predictive commoning transformations, and possibly unroll the
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