More info can also be found at http://gcc.gnu.org/wiki/AutoParInGCC */
/*
Reduction handling:
- currently we use vect_force_simple_reduction() to detect reduction patterns.
+ currently we use code inspired by vect_force_simple_reduction to detect
+ reduction patterns.
The code transformation will be introduced by an example.
*/
+/* Error reporting helper for parloops_is_simple_reduction below. GIMPLE
+ statement STMT is printed with a message MSG. */
+
+static void
+report_ploop_op (dump_flags_t msg_type, gimple *stmt, const char *msg)
+{
+ dump_printf_loc (msg_type, vect_location, "%s%G", msg, stmt);
+}
+
+/* DEF_STMT_INFO occurs in a loop that contains a potential reduction
+ operation. Return true if the results of DEF_STMT_INFO are something
+ that can be accumulated by such a reduction. */
+
+static bool
+parloops_valid_reduction_input_p (stmt_vec_info def_stmt_info)
+{
+ return (is_gimple_assign (def_stmt_info->stmt)
+ || is_gimple_call (def_stmt_info->stmt)
+ || STMT_VINFO_DEF_TYPE (def_stmt_info) == vect_induction_def
+ || (gimple_code (def_stmt_info->stmt) == GIMPLE_PHI
+ && STMT_VINFO_DEF_TYPE (def_stmt_info) == vect_internal_def
+ && !is_loop_header_bb_p (gimple_bb (def_stmt_info->stmt))));
+}
+
+/* Detect SLP reduction of the form:
+
+ #a1 = phi <a5, a0>
+ a2 = operation (a1)
+ a3 = operation (a2)
+ a4 = operation (a3)
+ a5 = operation (a4)
+
+ #a = phi <a5>
+
+ PHI is the reduction phi node (#a1 = phi <a5, a0> above)
+ FIRST_STMT is the first reduction stmt in the chain
+ (a2 = operation (a1)).
+
+ Return TRUE if a reduction chain was detected. */
+
+static bool
+parloops_is_slp_reduction (loop_vec_info loop_info, gimple *phi,
+ gimple *first_stmt)
+{
+ class loop *loop = (gimple_bb (phi))->loop_father;
+ class loop *vect_loop = LOOP_VINFO_LOOP (loop_info);
+ enum tree_code code;
+ gimple *loop_use_stmt = NULL;
+ stmt_vec_info use_stmt_info;
+ tree lhs;
+ imm_use_iterator imm_iter;
+ use_operand_p use_p;
+ int nloop_uses, size = 0, n_out_of_loop_uses;
+ bool found = false;
+
+ if (loop != vect_loop)
+ return false;
+
+ auto_vec<stmt_vec_info, 8> reduc_chain;
+ lhs = PHI_RESULT (phi);
+ code = gimple_assign_rhs_code (first_stmt);
+ while (1)
+ {
+ nloop_uses = 0;
+ n_out_of_loop_uses = 0;
+ FOR_EACH_IMM_USE_FAST (use_p, imm_iter, lhs)
+ {
+ gimple *use_stmt = USE_STMT (use_p);
+ if (is_gimple_debug (use_stmt))
+ continue;
+
+ /* Check if we got back to the reduction phi. */
+ if (use_stmt == phi)
+ {
+ loop_use_stmt = use_stmt;
+ found = true;
+ break;
+ }
+
+ if (flow_bb_inside_loop_p (loop, gimple_bb (use_stmt)))
+ {
+ loop_use_stmt = use_stmt;
+ nloop_uses++;
+ }
+ else
+ n_out_of_loop_uses++;
+
+ /* There are can be either a single use in the loop or two uses in
+ phi nodes. */
+ if (nloop_uses > 1 || (n_out_of_loop_uses && nloop_uses))
+ return false;
+ }
+
+ if (found)
+ break;
+
+ /* We reached a statement with no loop uses. */
+ if (nloop_uses == 0)
+ return false;
+
+ /* This is a loop exit phi, and we haven't reached the reduction phi. */
+ if (gimple_code (loop_use_stmt) == GIMPLE_PHI)
+ return false;
+
+ if (!is_gimple_assign (loop_use_stmt)
+ || code != gimple_assign_rhs_code (loop_use_stmt)
+ || !flow_bb_inside_loop_p (loop, gimple_bb (loop_use_stmt)))
+ return false;
+
+ /* Insert USE_STMT into reduction chain. */
+ use_stmt_info = loop_info->lookup_stmt (loop_use_stmt);
+ reduc_chain.safe_push (use_stmt_info);
+
+ lhs = gimple_assign_lhs (loop_use_stmt);
+ size++;
+ }
+
+ if (!found || loop_use_stmt != phi || size < 2)
+ return false;
+
+ /* Swap the operands, if needed, to make the reduction operand be the second
+ operand. */
+ lhs = PHI_RESULT (phi);
+ for (unsigned i = 0; i < reduc_chain.length (); ++i)
+ {
+ gassign *next_stmt = as_a <gassign *> (reduc_chain[i]->stmt);
+ if (gimple_assign_rhs2 (next_stmt) == lhs)
+ {
+ tree op = gimple_assign_rhs1 (next_stmt);
+ stmt_vec_info def_stmt_info = loop_info->lookup_def (op);
+
+ /* Check that the other def is either defined in the loop
+ ("vect_internal_def"), or it's an induction (defined by a
+ loop-header phi-node). */
+ if (def_stmt_info
+ && flow_bb_inside_loop_p (loop, gimple_bb (def_stmt_info->stmt))
+ && parloops_valid_reduction_input_p (def_stmt_info))
+ {
+ lhs = gimple_assign_lhs (next_stmt);
+ continue;
+ }
+
+ return false;
+ }
+ else
+ {
+ tree op = gimple_assign_rhs2 (next_stmt);
+ stmt_vec_info def_stmt_info = loop_info->lookup_def (op);
+
+ /* Check that the other def is either defined in the loop
+ ("vect_internal_def"), or it's an induction (defined by a
+ loop-header phi-node). */
+ if (def_stmt_info
+ && flow_bb_inside_loop_p (loop, gimple_bb (def_stmt_info->stmt))
+ && parloops_valid_reduction_input_p (def_stmt_info))
+ {
+ if (dump_enabled_p ())
+ dump_printf_loc (MSG_NOTE, vect_location, "swapping oprnds: %G",
+ next_stmt);
+
+ swap_ssa_operands (next_stmt,
+ gimple_assign_rhs1_ptr (next_stmt),
+ gimple_assign_rhs2_ptr (next_stmt));
+ update_stmt (next_stmt);
+
+ if (CONSTANT_CLASS_P (gimple_assign_rhs1 (next_stmt)))
+ LOOP_VINFO_OPERANDS_SWAPPED (loop_info) = true;
+ }
+ else
+ return false;
+ }
+
+ lhs = gimple_assign_lhs (next_stmt);
+ }
+
+ /* Build up the actual chain. */
+ for (unsigned i = 0; i < reduc_chain.length () - 1; ++i)
+ {
+ REDUC_GROUP_FIRST_ELEMENT (reduc_chain[i]) = reduc_chain[0];
+ REDUC_GROUP_NEXT_ELEMENT (reduc_chain[i]) = reduc_chain[i+1];
+ }
+ REDUC_GROUP_FIRST_ELEMENT (reduc_chain.last ()) = reduc_chain[0];
+ REDUC_GROUP_NEXT_ELEMENT (reduc_chain.last ()) = NULL;
+
+ /* Save the chain for further analysis in SLP detection. */
+ LOOP_VINFO_REDUCTION_CHAINS (loop_info).safe_push (reduc_chain[0]);
+ REDUC_GROUP_SIZE (reduc_chain[0]) = size;
+
+ return true;
+}
+
+/* Return true if we need an in-order reduction for operation CODE
+ on type TYPE. NEED_WRAPPING_INTEGRAL_OVERFLOW is true if integer
+ overflow must wrap. */
+
+static bool
+parloops_needs_fold_left_reduction_p (tree type, tree_code code,
+ bool need_wrapping_integral_overflow)
+{
+ /* CHECKME: check for !flag_finite_math_only too? */
+ if (SCALAR_FLOAT_TYPE_P (type))
+ switch (code)
+ {
+ case MIN_EXPR:
+ case MAX_EXPR:
+ return false;
+
+ default:
+ return !flag_associative_math;
+ }
+
+ if (INTEGRAL_TYPE_P (type))
+ {
+ if (!operation_no_trapping_overflow (type, code))
+ return true;
+ if (need_wrapping_integral_overflow
+ && !TYPE_OVERFLOW_WRAPS (type)
+ && operation_can_overflow (code))
+ return true;
+ return false;
+ }
+
+ if (SAT_FIXED_POINT_TYPE_P (type))
+ return true;
+
+ return false;
+}
+
+
+/* Function parloops_is_simple_reduction
+
+ (1) Detect a cross-iteration def-use cycle that represents a simple
+ reduction computation. We look for the following pattern:
+
+ loop_header:
+ a1 = phi < a0, a2 >
+ a3 = ...
+ a2 = operation (a3, a1)
+
+ or
+
+ a3 = ...
+ loop_header:
+ a1 = phi < a0, a2 >
+ a2 = operation (a3, a1)
+
+ such that:
+ 1. operation is commutative and associative and it is safe to
+ change the order of the computation
+ 2. no uses for a2 in the loop (a2 is used out of the loop)
+ 3. no uses of a1 in the loop besides the reduction operation
+ 4. no uses of a1 outside the loop.
+
+ Conditions 1,4 are tested here.
+ Conditions 2,3 are tested in vect_mark_stmts_to_be_vectorized.
+
+ (2) Detect a cross-iteration def-use cycle in nested loops, i.e.,
+ nested cycles.
+
+ (3) Detect cycles of phi nodes in outer-loop vectorization, i.e., double
+ reductions:
+
+ a1 = phi < a0, a2 >
+ inner loop (def of a3)
+ a2 = phi < a3 >
+
+ (4) Detect condition expressions, ie:
+ for (int i = 0; i < N; i++)
+ if (a[i] < val)
+ ret_val = a[i];
+
+*/
+
+static stmt_vec_info
+parloops_is_simple_reduction (loop_vec_info loop_info, stmt_vec_info phi_info,
+ bool *double_reduc,
+ bool need_wrapping_integral_overflow,
+ enum vect_reduction_type *v_reduc_type)
+{
+ gphi *phi = as_a <gphi *> (phi_info->stmt);
+ class loop *loop = (gimple_bb (phi))->loop_father;
+ class loop *vect_loop = LOOP_VINFO_LOOP (loop_info);
+ bool nested_in_vect_loop = flow_loop_nested_p (vect_loop, loop);
+ gimple *phi_use_stmt = NULL;
+ enum tree_code orig_code, code;
+ tree op1, op2, op3 = NULL_TREE, op4 = NULL_TREE;
+ tree type;
+ tree name;
+ imm_use_iterator imm_iter;
+ use_operand_p use_p;
+ bool phi_def;
+
+ *double_reduc = false;
+ *v_reduc_type = TREE_CODE_REDUCTION;
+
+ tree phi_name = PHI_RESULT (phi);
+ /* ??? If there are no uses of the PHI result the inner loop reduction
+ won't be detected as possibly double-reduction by vectorizable_reduction
+ because that tries to walk the PHI arg from the preheader edge which
+ can be constant. See PR60382. */
+ if (has_zero_uses (phi_name))
+ return NULL;
+ unsigned nphi_def_loop_uses = 0;
+ FOR_EACH_IMM_USE_FAST (use_p, imm_iter, phi_name)
+ {
+ gimple *use_stmt = USE_STMT (use_p);
+ if (is_gimple_debug (use_stmt))
+ continue;
+
+ if (!flow_bb_inside_loop_p (loop, gimple_bb (use_stmt)))
+ {
+ if (dump_enabled_p ())
+ dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
+ "intermediate value used outside loop.\n");
+
+ return NULL;
+ }
+
+ nphi_def_loop_uses++;
+ phi_use_stmt = use_stmt;
+ }
+
+ edge latch_e = loop_latch_edge (loop);
+ tree loop_arg = PHI_ARG_DEF_FROM_EDGE (phi, latch_e);
+ if (TREE_CODE (loop_arg) != SSA_NAME)
+ {
+ if (dump_enabled_p ())
+ dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
+ "reduction: not ssa_name: %T\n", loop_arg);
+ return NULL;
+ }
+
+ stmt_vec_info def_stmt_info = loop_info->lookup_def (loop_arg);
+ if (!def_stmt_info
+ || !flow_bb_inside_loop_p (loop, gimple_bb (def_stmt_info->stmt)))
+ return NULL;
+
+ if (gassign *def_stmt = dyn_cast <gassign *> (def_stmt_info->stmt))
+ {
+ name = gimple_assign_lhs (def_stmt);
+ phi_def = false;
+ }
+ else if (gphi *def_stmt = dyn_cast <gphi *> (def_stmt_info->stmt))
+ {
+ name = PHI_RESULT (def_stmt);
+ phi_def = true;
+ }
+ else
+ {
+ if (dump_enabled_p ())
+ dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
+ "reduction: unhandled reduction operation: %G",
+ def_stmt_info->stmt);
+ return NULL;
+ }
+
+ unsigned nlatch_def_loop_uses = 0;
+ auto_vec<gphi *, 3> lcphis;
+ bool inner_loop_of_double_reduc = false;
+ FOR_EACH_IMM_USE_FAST (use_p, imm_iter, name)
+ {
+ gimple *use_stmt = USE_STMT (use_p);
+ if (is_gimple_debug (use_stmt))
+ continue;
+ if (flow_bb_inside_loop_p (loop, gimple_bb (use_stmt)))
+ nlatch_def_loop_uses++;
+ else
+ {
+ /* We can have more than one loop-closed PHI. */
+ lcphis.safe_push (as_a <gphi *> (use_stmt));
+ if (nested_in_vect_loop
+ && (STMT_VINFO_DEF_TYPE (loop_info->lookup_stmt (use_stmt))
+ == vect_double_reduction_def))
+ inner_loop_of_double_reduc = true;
+ }
+ }
+
+ /* If this isn't a nested cycle or if the nested cycle reduction value
+ is used ouside of the inner loop we cannot handle uses of the reduction
+ value. */
+ if ((!nested_in_vect_loop || inner_loop_of_double_reduc)
+ && (nlatch_def_loop_uses > 1 || nphi_def_loop_uses > 1))
+ {
+ if (dump_enabled_p ())
+ dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
+ "reduction used in loop.\n");
+ return NULL;
+ }
+
+ /* If DEF_STMT is a phi node itself, we expect it to have a single argument
+ defined in the inner loop. */
+ if (phi_def)
+ {
+ gphi *def_stmt = as_a <gphi *> (def_stmt_info->stmt);
+ op1 = PHI_ARG_DEF (def_stmt, 0);
+
+ if (gimple_phi_num_args (def_stmt) != 1
+ || TREE_CODE (op1) != SSA_NAME)
+ {
+ if (dump_enabled_p ())
+ dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
+ "unsupported phi node definition.\n");
+
+ return NULL;
+ }
+
+ gimple *def1 = SSA_NAME_DEF_STMT (op1);
+ if (gimple_bb (def1)
+ && flow_bb_inside_loop_p (loop, gimple_bb (def_stmt))
+ && loop->inner
+ && flow_bb_inside_loop_p (loop->inner, gimple_bb (def1))
+ && is_gimple_assign (def1)
+ && is_a <gphi *> (phi_use_stmt)
+ && flow_bb_inside_loop_p (loop->inner, gimple_bb (phi_use_stmt)))
+ {
+ if (dump_enabled_p ())
+ report_ploop_op (MSG_NOTE, def_stmt,
+ "detected double reduction: ");
+
+ *double_reduc = true;
+ return def_stmt_info;
+ }
+
+ return NULL;
+ }
+
+ /* If we are vectorizing an inner reduction we are executing that
+ in the original order only in case we are not dealing with a
+ double reduction. */
+ bool check_reduction = true;
+ if (flow_loop_nested_p (vect_loop, loop))
+ {
+ gphi *lcphi;
+ unsigned i;
+ check_reduction = false;
+ FOR_EACH_VEC_ELT (lcphis, i, lcphi)
+ FOR_EACH_IMM_USE_FAST (use_p, imm_iter, gimple_phi_result (lcphi))
+ {
+ gimple *use_stmt = USE_STMT (use_p);
+ if (is_gimple_debug (use_stmt))
+ continue;
+ if (! flow_bb_inside_loop_p (vect_loop, gimple_bb (use_stmt)))
+ check_reduction = true;
+ }
+ }
+
+ gassign *def_stmt = as_a <gassign *> (def_stmt_info->stmt);
+ code = orig_code = gimple_assign_rhs_code (def_stmt);
+
+ if (nested_in_vect_loop && !check_reduction)
+ {
+ /* FIXME: Even for non-reductions code generation is funneled
+ through vectorizable_reduction for the stmt defining the
+ PHI latch value. So we have to artificially restrict ourselves
+ for the supported operations. */
+ switch (get_gimple_rhs_class (code))
+ {
+ case GIMPLE_BINARY_RHS:
+ case GIMPLE_TERNARY_RHS:
+ break;
+ default:
+ /* Not supported by vectorizable_reduction. */
+ if (dump_enabled_p ())
+ report_ploop_op (MSG_MISSED_OPTIMIZATION, def_stmt,
+ "nested cycle: not handled operation: ");
+ return NULL;
+ }
+ if (dump_enabled_p ())
+ report_ploop_op (MSG_NOTE, def_stmt, "detected nested cycle: ");
+ return def_stmt_info;
+ }
+
+ /* We can handle "res -= x[i]", which is non-associative by
+ simply rewriting this into "res += -x[i]". Avoid changing
+ gimple instruction for the first simple tests and only do this
+ if we're allowed to change code at all. */
+ if (code == MINUS_EXPR && gimple_assign_rhs2 (def_stmt) != phi_name)
+ code = PLUS_EXPR;
+
+ if (code == COND_EXPR)
+ {
+ if (! nested_in_vect_loop)
+ *v_reduc_type = COND_REDUCTION;
+
+ op3 = gimple_assign_rhs1 (def_stmt);
+ if (COMPARISON_CLASS_P (op3))
+ {
+ op4 = TREE_OPERAND (op3, 1);
+ op3 = TREE_OPERAND (op3, 0);
+ }
+ if (op3 == phi_name || op4 == phi_name)
+ {
+ if (dump_enabled_p ())
+ report_ploop_op (MSG_MISSED_OPTIMIZATION, def_stmt,
+ "reduction: condition depends on previous"
+ " iteration: ");
+ return NULL;
+ }
+
+ op1 = gimple_assign_rhs2 (def_stmt);
+ op2 = gimple_assign_rhs3 (def_stmt);
+ }
+ else if (!commutative_tree_code (code) || !associative_tree_code (code))
+ {
+ if (dump_enabled_p ())
+ report_ploop_op (MSG_MISSED_OPTIMIZATION, def_stmt,
+ "reduction: not commutative/associative: ");
+ return NULL;
+ }
+ else if (get_gimple_rhs_class (code) == GIMPLE_BINARY_RHS)
+ {
+ op1 = gimple_assign_rhs1 (def_stmt);
+ op2 = gimple_assign_rhs2 (def_stmt);
+ }
+ else
+ {
+ if (dump_enabled_p ())
+ report_ploop_op (MSG_MISSED_OPTIMIZATION, def_stmt,
+ "reduction: not handled operation: ");
+ return NULL;
+ }
+
+ if (TREE_CODE (op1) != SSA_NAME && TREE_CODE (op2) != SSA_NAME)
+ {
+ if (dump_enabled_p ())
+ report_ploop_op (MSG_MISSED_OPTIMIZATION, def_stmt,
+ "reduction: both uses not ssa_names: ");
+
+ return NULL;
+ }
+
+ type = TREE_TYPE (gimple_assign_lhs (def_stmt));
+ if ((TREE_CODE (op1) == SSA_NAME
+ && !types_compatible_p (type,TREE_TYPE (op1)))
+ || (TREE_CODE (op2) == SSA_NAME
+ && !types_compatible_p (type, TREE_TYPE (op2)))
+ || (op3 && TREE_CODE (op3) == SSA_NAME
+ && !types_compatible_p (type, TREE_TYPE (op3)))
+ || (op4 && TREE_CODE (op4) == SSA_NAME
+ && !types_compatible_p (type, TREE_TYPE (op4))))
+ {
+ if (dump_enabled_p ())
+ {
+ dump_printf_loc (MSG_NOTE, vect_location,
+ "reduction: multiple types: operation type: "
+ "%T, operands types: %T,%T",
+ type, TREE_TYPE (op1), TREE_TYPE (op2));
+ if (op3)
+ dump_printf (MSG_NOTE, ",%T", TREE_TYPE (op3));
+
+ if (op4)
+ dump_printf (MSG_NOTE, ",%T", TREE_TYPE (op4));
+ dump_printf (MSG_NOTE, "\n");
+ }
+
+ return NULL;
+ }
+
+ /* Check whether it's ok to change the order of the computation.
+ Generally, when vectorizing a reduction we change the order of the
+ computation. This may change the behavior of the program in some
+ cases, so we need to check that this is ok. One exception is when
+ vectorizing an outer-loop: the inner-loop is executed sequentially,
+ and therefore vectorizing reductions in the inner-loop during
+ outer-loop vectorization is safe. */
+ if (check_reduction
+ && *v_reduc_type == TREE_CODE_REDUCTION
+ && parloops_needs_fold_left_reduction_p (type, code,
+ need_wrapping_integral_overflow))
+ *v_reduc_type = FOLD_LEFT_REDUCTION;
+
+ /* Reduction is safe. We're dealing with one of the following:
+ 1) integer arithmetic and no trapv
+ 2) floating point arithmetic, and special flags permit this optimization
+ 3) nested cycle (i.e., outer loop vectorization). */
+ stmt_vec_info def1_info = loop_info->lookup_def (op1);
+ stmt_vec_info def2_info = loop_info->lookup_def (op2);
+ if (code != COND_EXPR && !def1_info && !def2_info)
+ {
+ if (dump_enabled_p ())
+ report_ploop_op (MSG_NOTE, def_stmt,
+ "reduction: no defs for operands: ");
+ return NULL;
+ }
+
+ /* Check that one def is the reduction def, defined by PHI,
+ the other def is either defined in the loop ("vect_internal_def"),
+ or it's an induction (defined by a loop-header phi-node). */
+
+ if (def2_info
+ && def2_info->stmt == phi
+ && (code == COND_EXPR
+ || !def1_info
+ || !flow_bb_inside_loop_p (loop, gimple_bb (def1_info->stmt))
+ || parloops_valid_reduction_input_p (def1_info)))
+ {
+ if (dump_enabled_p ())
+ report_ploop_op (MSG_NOTE, def_stmt, "detected reduction: ");
+ return def_stmt_info;
+ }
+
+ if (def1_info
+ && def1_info->stmt == phi
+ && (code == COND_EXPR
+ || !def2_info
+ || !flow_bb_inside_loop_p (loop, gimple_bb (def2_info->stmt))
+ || parloops_valid_reduction_input_p (def2_info)))
+ {
+ if (! nested_in_vect_loop && orig_code != MINUS_EXPR)
+ {
+ /* Check if we can swap operands (just for simplicity - so that
+ the rest of the code can assume that the reduction variable
+ is always the last (second) argument). */
+ if (code == COND_EXPR)
+ {
+ /* Swap cond_expr by inverting the condition. */
+ tree cond_expr = gimple_assign_rhs1 (def_stmt);
+ enum tree_code invert_code = ERROR_MARK;
+ enum tree_code cond_code = TREE_CODE (cond_expr);
+
+ if (TREE_CODE_CLASS (cond_code) == tcc_comparison)
+ {
+ bool honor_nans = HONOR_NANS (TREE_OPERAND (cond_expr, 0));
+ invert_code = invert_tree_comparison (cond_code, honor_nans);
+ }
+ if (invert_code != ERROR_MARK)
+ {
+ TREE_SET_CODE (cond_expr, invert_code);
+ swap_ssa_operands (def_stmt,
+ gimple_assign_rhs2_ptr (def_stmt),
+ gimple_assign_rhs3_ptr (def_stmt));
+ }
+ else
+ {
+ if (dump_enabled_p ())
+ report_ploop_op (MSG_NOTE, def_stmt,
+ "detected reduction: cannot swap operands "
+ "for cond_expr");
+ return NULL;
+ }
+ }
+ else
+ swap_ssa_operands (def_stmt, gimple_assign_rhs1_ptr (def_stmt),
+ gimple_assign_rhs2_ptr (def_stmt));
+
+ if (dump_enabled_p ())
+ report_ploop_op (MSG_NOTE, def_stmt,
+ "detected reduction: need to swap operands: ");
+
+ if (CONSTANT_CLASS_P (gimple_assign_rhs1 (def_stmt)))
+ LOOP_VINFO_OPERANDS_SWAPPED (loop_info) = true;
+ }
+ else
+ {
+ if (dump_enabled_p ())
+ report_ploop_op (MSG_NOTE, def_stmt, "detected reduction: ");
+ }
+
+ return def_stmt_info;
+ }
+
+ /* Try to find SLP reduction chain. */
+ if (! nested_in_vect_loop
+ && code != COND_EXPR
+ && orig_code != MINUS_EXPR
+ && parloops_is_slp_reduction (loop_info, phi, def_stmt))
+ {
+ if (dump_enabled_p ())
+ report_ploop_op (MSG_NOTE, def_stmt,
+ "reduction: detected reduction chain: ");
+
+ return def_stmt_info;
+ }
+
+ /* Look for the expression computing loop_arg from loop PHI result. */
+ if (check_reduction_path (vect_location, loop, phi, loop_arg, code))
+ return def_stmt_info;
+
+ if (dump_enabled_p ())
+ {
+ report_ploop_op (MSG_MISSED_OPTIMIZATION, def_stmt,
+ "reduction: unknown pattern: ");
+ }
+
+ return NULL;
+}
+
+/* Wrapper around vect_is_simple_reduction, which will modify code
+ in-place if it enables detection of more reductions. Arguments
+ as there. */
+
+stmt_vec_info
+parloops_force_simple_reduction (loop_vec_info loop_info, stmt_vec_info phi_info,
+ bool *double_reduc,
+ bool need_wrapping_integral_overflow)
+{
+ enum vect_reduction_type v_reduc_type;
+ stmt_vec_info def_info
+ = parloops_is_simple_reduction (loop_info, phi_info, double_reduc,
+ need_wrapping_integral_overflow,
+ &v_reduc_type);
+ if (def_info)
+ {
+ STMT_VINFO_REDUC_TYPE (phi_info) = v_reduc_type;
+ STMT_VINFO_REDUC_DEF (phi_info) = def_info;
+ STMT_VINFO_REDUC_TYPE (def_info) = v_reduc_type;
+ STMT_VINFO_REDUC_DEF (def_info) = phi_info;
+ }
+ return def_info;
+}
+
/* Minimal number of iterations of a loop that should be executed in each
thread. */
#define MIN_PER_THREAD PARAM_VALUE (PARAM_PARLOOPS_MIN_PER_THREAD)
continue;
stmt_vec_info reduc_stmt_info
- = vect_force_simple_reduction (simple_loop_info,
- simple_loop_info->lookup_stmt (phi),
- &double_reduc, true);
+ = parloops_force_simple_reduction (simple_loop_info,
+ simple_loop_info->lookup_stmt (phi),
+ &double_reduc, true);
if (!reduc_stmt_info || !valid_reduction_p (reduc_stmt_info))
continue;
stmt_vec_info inner_phi_info
= simple_loop_info->lookup_stmt (inner_phi);
stmt_vec_info inner_reduc_stmt_info
- = vect_force_simple_reduction (simple_loop_info,
- inner_phi_info,
- &double_reduc, true);
+ = parloops_force_simple_reduction (simple_loop_info,
+ inner_phi_info,
+ &double_reduc, true);
gcc_assert (!double_reduc);
if (!inner_reduc_stmt_info
|| !valid_reduction_p (inner_reduc_stmt_info))
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