/*
- * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
+ * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
*
* This file is part of libFirm.
*
/**
* @file
+ * @brief lowers operations with mode_b. The result is a graph which
+ * might still contains some convs from/to mode_b, but no
+ * operations are performed on them anymore, they are just there
+ * so modes match. A backend can safely skip all mode_b convs.
* @author Matthias Braun, Christoph Mallon
* @version $Id$
+ *
+ * After this pass the following should hold:
+ * - The only inputs with mode_b are for the Cond node or the
+ * Sel input of a Mux node.
+ * - The only nodes producing mode_b are: Proj(Cmp) and ConvB(X) (where X
+ * is some mode that can be converted to the lowered mode).
+ * ConvB will usually be implemented by a comparison with 0 producing some
+ * flags in the backends. It's debatable wether ConvB(X) is a goode idea.
+ * Maybe we should rather introduce a Test node.
+ * All other former uses should be converted to manipulations with an integer
+ * mode that was specified in the pass configuration.
*/
-#ifdef HAVE_CONFIG_H
#include "config.h"
-#endif
#include <stdlib.h>
+#include <stdbool.h>
#include "irnode_t.h"
#include "ircons_t.h"
+#include "irflag.h"
#include "irgwalk.h"
#include "irtools.h"
+#include "iredges.h"
+#include "iropt_t.h"
#include "tv.h"
#include "error.h"
#include "lowering.h"
+#include "pdeq.h"
+#include "irpass_t.h"
+
+static lower_mode_b_config_t config;
+static ir_type *lowered_type = NULL;
+static pdeq *lowered_nodes = NULL;
+
+/**
+ * Removes a node if its out-edge count has reached 0.
+ * temporary hack until we have proper automatic dead code elimination.
+ */
+static void maybe_kill_node(ir_node *node)
+{
+ ir_graph *irg;
+ int i, arity;
-static ir_mode *lowered_mode = NULL;
-static int lower_direct_cmp = 0;
+ if (get_irn_n_edges(node) != 0)
+ return;
+
+ irg = get_irn_irg(node);
+
+ assert(!is_Bad(node));
+
+ arity = get_irn_arity(node);
+ for (i = 0; i < arity; ++i) {
+ set_irn_n(node, i, new_r_Bad(irg));
+ }
+ set_nodes_block(node, new_r_Bad(irg));
+
+ edges_node_deleted(node, irg);
+}
static ir_node *create_not(dbg_info *dbgi, ir_node *node)
{
- ir_graph *irg = current_ir_graph;
ir_node *block = get_nodes_block(node);
- tarval *tv_one = get_tarval_one(lowered_mode);
- ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
+ ir_mode *mode = config.lowered_mode;
+ tarval *tv_one = get_mode_one(mode);
+ ir_graph *irg = get_irn_irg(node);
+ ir_node *one = new_rd_Const(dbgi, irg, tv_one);
- return new_rd_Eor(dbgi, irg, block, node, one, lowered_mode);
+ return new_rd_Eor(dbgi, block, node, one, mode);
}
-static int is_Const_0(const ir_node *node)
+static ir_node *create_convb(ir_node *node)
{
- tarval *tv;
+ ir_node *block = get_nodes_block(node);
+ ir_node *conv = new_rd_Conv(NULL, block, node, mode_b);
- if(!is_Const(node))
- return 0;
+ return conv;
+}
- tv = get_Const_tarval(node);
- return tarval_is_null(tv);
+static ir_type *create_lowered_type(void)
+{
+ if (lowered_type == NULL) {
+ lowered_type = new_type_primitive(config.lowered_mode);
+ }
+ return lowered_type;
+}
+
+/**
+ * creates a "set" node that produces a 0 or 1 based on a Cmp result
+ */
+static ir_node *create_set(ir_node *node)
+{
+ dbg_info *dbgi = get_irn_dbg_info(node);
+ ir_graph *irg = get_irn_irg(node);
+ ir_mode *mode = config.lowered_set_mode;
+ tarval *tv_one = get_mode_one(mode);
+ ir_node *one = new_rd_Const(dbgi, irg, tv_one);
+ ir_node *block = get_nodes_block(node);
+ tarval *tv_zero = get_mode_null(mode);
+ ir_node *zero = new_rd_Const(dbgi, irg, tv_zero);
+
+ ir_node *set = new_rd_Mux(dbgi, block, node, zero, one, mode);
+
+ if (mode != config.lowered_mode) {
+ set = new_r_Conv(block, set, config.lowered_mode);
+ }
+
+ return set;
+}
+
+static void adjust_method_type(ir_type *method_type)
+{
+ int i;
+ int n_params;
+ int n_res;
+
+ n_params = get_method_n_params(method_type);
+ for (i = 0; i < n_params; ++i) {
+ ir_type *param = get_method_param_type(method_type, i);
+ if (get_type_mode(param) == mode_b) {
+ set_method_param_type(method_type, i, create_lowered_type());
+ }
+ }
+
+ n_res = get_method_n_ress(method_type);
+ for (i = 0; i < n_res; ++i) {
+ ir_type *res_type = get_method_res_type(method_type, i);
+ if (get_type_mode(res_type) == mode_b) {
+ set_method_res_type(method_type, i, create_lowered_type());
+ }
+ }
}
static ir_node *lower_node(ir_node *node)
{
- ir_graph *irg = current_ir_graph;
dbg_info *dbgi = get_irn_dbg_info(node);
- ir_op *op = get_irn_op(node);
ir_node *block = get_nodes_block(node);
+ ir_mode *mode = config.lowered_mode;
+ ir_graph *irg;
+ ir_node *res;
+
+ res = get_irn_link(node);
+ if (res != NULL)
+ return res;
assert(get_irn_mode(node) == mode_b);
- /* TODO: be robust against phi-loops... */
+ irg = get_irn_irg(node);
+ switch (get_irn_opcode(node)) {
+ case iro_Phi: {
+ int i, arity;
+ ir_node **in;
+ ir_node *unknown, *new_phi;
+
+ arity = get_irn_arity(node);
+ in = ALLOCAN(ir_node*, arity);
+ unknown = new_r_Unknown(irg, mode);
+ for (i = 0; i < arity; ++i) {
+ in[i] = unknown;
+ }
+ new_phi = new_r_Phi(block, arity, in, mode);
+ /* FIXME This does not correctly break cycles: The Phi might not be the
+ * first in the recursion, so the caller(s) are some yet un-lowered nodes
+ * and this Phi might have them (indirectly) as operands, so they would be
+ * replaced twice. */
+ set_irn_link(node, new_phi);
+ pdeq_putr(lowered_nodes, node);
+
+ for (i = 0; i < arity; ++i) {
+ ir_node *in = get_irn_n(node, i);
+ ir_node *low_in = lower_node(in);
+
+ set_irn_n(new_phi, i, low_in);
+ }
- if(op == op_And || op == op_Or || op == op_Eor || op == op_Phi) {
+ return new_phi;
+ }
+
+ case iro_And:
+ case iro_Or:
+ case iro_Eor: {
int i, arity;
- ir_node *copy = exact_copy(node);
+ res = exact_copy(node);
arity = get_irn_arity(node);
- for(i = 0; i < arity; ++i) {
+ for (i = 0; i < arity; ++i) {
ir_node *in = get_irn_n(node, i);
ir_node *low_in = lower_node(in);
- set_irn_n(copy, i, low_in);
+ set_irn_n(res, i, low_in);
}
- set_irn_mode(copy, lowered_mode);
- return copy;
+ set_irn_mode(res, mode);
+ break;
}
- if(op == op_Not) {
+
+ case iro_Not: {
ir_node *op = get_Not_op(node);
ir_node *low_op = lower_node(op);
- return create_not(dbgi, low_op);
+ res = create_not(dbgi, low_op);
+ break;
}
- if(op == op_Psi) {
- ir_node *cond = get_Psi_cond(node, 0);
+
+ case iro_Mux: {
+ ir_node *cond = get_Mux_sel(node);
ir_node *low_cond = lower_node(cond);
- ir_node *v_true = get_Psi_val(node, 0);
+ ir_node *v_true = get_Mux_true(node);
ir_node *low_v_true = lower_node(v_true);
- ir_node *v_false = get_Psi_default(node);
+ ir_node *v_false = get_Mux_false(node);
ir_node *low_v_false = lower_node(v_false);
- ir_node *and0 = new_rd_And(dbgi, irg, block, cond, low_v_true,
- lowered_mode);
-
+ ir_node *and0 = new_rd_And(dbgi, block, low_cond, low_v_true, mode);
ir_node *not_cond = create_not(dbgi, low_cond);
+ ir_node *and1 = new_rd_And(dbgi, block, not_cond, low_v_false, mode);
+ res = new_rd_Or(dbgi, block, and0, and1, mode);
+ break;
+ }
- ir_node *and1 = new_rd_And(dbgi, irg, block, not_cond, low_v_false,
- lowered_mode);
-
- ir_node *or = new_rd_Or(dbgi, irg, block, and0, and1,
- lowered_mode);
+ case iro_Conv: {
+ ir_node *pred = get_Conv_op(node);
+ ir_mode *mode = get_irn_mode(pred);
+ tarval *tv_zeroc = get_mode_null(mode);
+ ir_node *zero_cmp = new_rd_Const(dbgi, irg, tv_zeroc);
- return or;
- }
- if(op == op_Conv) {
- tarval *tv_one = get_tarval_one(lowered_mode);
- ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
- tarval *tv_zero = get_tarval_null(lowered_mode);
- ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
- ir_mode *mode = get_irn_mode(node);
- tarval *tv_zeroc = get_tarval_null(mode);
- ir_node *zero_cmp = new_d_Const(dbgi, mode, tv_zeroc);
-
- ir_node *cmp = new_rd_Cmp(dbgi, irg, block, node, zero_cmp);
- ir_node *proj = new_rd_Proj(dbgi, irg, block, cmp, mode_b,
- pn_Cmp_Lg);
- ir_node *vals[2] = { one, zero };
- ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &proj, vals,
- lowered_mode);
-
- return psi;
+ ir_node *cmp = new_rd_Cmp(dbgi, block, pred, zero_cmp);
+ ir_node *proj = new_rd_Proj(dbgi, cmp, mode_b, pn_Cmp_Lg);
+ res = create_set(proj);
+ break;
}
- if(op == op_Proj) {
- ir_node *pred = get_Proj_pred(node);
- assert(!is_Load(pred));
- if(is_Cmp(pred)) {
- ir_mode *mode = get_irn_mode(pred);
+ case iro_Proj: {
+ ir_node *pred = get_Proj_pred(node);
+
+ if (is_Cmp(pred)) {
ir_node *left = get_Cmp_left(pred);
ir_node *right = get_Cmp_right(pred);
+ ir_mode *cmp_mode = get_irn_mode(left);
- if(get_mode_size_bits(mode) < get_mode_size_bits(lowered_mode)
- || is_Const_0(right)) {
+ if ((mode_is_int(cmp_mode) || mode_is_reference(cmp_mode)) &&
+ (get_mode_size_bits(cmp_mode) < get_mode_size_bits(mode) ||
+ (mode_is_signed(cmp_mode) && is_Const(right) && is_Const_null(right)))) {
int pnc = get_Proj_proj(node);
- ir_node *res = NULL;
int need_not = 0;
ir_node *a = NULL;
ir_node *b = NULL;
+ int bits;
+ tarval *tv;
+ ir_node *shift_cnt;
- if(pnc == pn_Cmp_Lt) {
+ if (pnc == pn_Cmp_Lt) {
/* a < b -> (a - b) >> 31 */
a = left;
b = right;
- } else if(pnc == pn_Cmp_Le) {
- /* a <= b -> ((a - b) >> 31) ^ 1 */
+ } else if (pnc == pn_Cmp_Le) {
+ /* a <= b -> ~(a - b) >> 31 */
a = right;
b = left;
need_not = 1;
- } else if(pnc == pn_Cmp_Gt) {
+ } else if (pnc == pn_Cmp_Gt) {
/* a > b -> (b - a) >> 31 */
a = right;
b = left;
- } else if(pnc == pn_Cmp_Ge) {
- /* a >= b -> ((a - b) >> 31) ^ 1 */
+ } else if (pnc == pn_Cmp_Ge) {
+ /* a >= b -> ~(a - b) >> 31 */
a = left;
b = right;
need_not = 1;
+ } else {
+ goto synth_zero_one;
}
- if(a != NULL) {
- tarval *tv = new_tarval_from_long(31, mode_Iu);
- ir_node *shift_cnt = new_d_Const(dbgi, mode_Iu, tv);
-
- if(mode != lowered_mode) {
- a = new_rd_Conv(dbgi, irg, block, a, lowered_mode);
- b = new_rd_Conv(dbgi, irg, block, b, lowered_mode);
- }
-
- res = new_rd_Sub(dbgi, irg, block, a, b, lowered_mode);
- res = new_rd_Shr(dbgi, irg, block, res, shift_cnt,
- lowered_mode);
+ bits = get_mode_size_bits(mode);
+ tv = new_tarval_from_long(bits-1, mode_Iu);
+ shift_cnt = new_rd_Const(dbgi, irg, tv);
- if(need_not) {
- res = create_not(dbgi, res);
- }
- return res;
+ if (cmp_mode != mode) {
+ a = new_rd_Conv(dbgi, block, a, mode);
+ b = new_rd_Conv(dbgi, block, b, mode);
}
- }
-
- {
- /* synthesize the 0/1 value */
- tarval *tv_one = get_tarval_one(lowered_mode);
- ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
- tarval *tv_zero = get_tarval_null(lowered_mode);
- ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
-
- ir_node *vals[2] = { one, zero };
- ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &node, vals,
- lowered_mode);
- return psi;
+ res = new_rd_Sub(dbgi, block, a, b, mode);
+ if (need_not) {
+ res = new_rd_Not(dbgi, block, res, mode);
+ }
+ res = new_rd_Shr(dbgi, block, res, shift_cnt, mode);
+ } else {
+ /* synthesize the 0/1 value */
+synth_zero_one:
+ res = create_set(node);
}
+ } else if (is_Proj(pred) && is_Call(get_Proj_pred(pred))) {
+ ir_type *type = get_Call_type(get_Proj_pred(pred));
+ adjust_method_type(type);
+ set_irn_mode(node, mode);
+ res = node;
+ goto own_replacement;
+ } else if (is_Proj(pred) && is_Start(get_Proj_pred(pred))) {
+ ir_graph *irg = get_irn_irg(node);
+ ir_entity *entity = get_irg_entity(irg);
+ ir_type *type = get_entity_type(entity);
+ adjust_method_type(type);
+ set_irn_mode(node, mode);
+ res = node;
+ goto own_replacement;
+ } else {
+ panic("unexpected projb: %+F (pred: %+F)", node, pred);
}
-
- panic("unexpected projb: %+F (pred: %+F)", node, pred);
- set_irn_mode(node, lowered_mode);
- return node;
+ break;
}
- if(op == op_Const) {
+
+ case iro_Const: {
tarval *tv = get_Const_tarval(node);
- if(tv == get_tarval_b_true()) {
- tarval *tv_one = get_tarval_one(lowered_mode);
- ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
- return one;
- } else if(tv == get_tarval_b_false()) {
- tarval *tv_zero = get_tarval_null(lowered_mode);
- ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
- return zero;
+ if (tv == get_tarval_b_true()) {
+ tarval *tv_one = get_mode_one(mode);
+ res = new_rd_Const(dbgi, irg, tv_one);
+ } else if (tv == get_tarval_b_false()) {
+ tarval *tv_zero = get_mode_null(mode);
+ res = new_rd_Const(dbgi, irg, tv_zero);
} else {
panic("invalid boolean const %+F", node);
}
+ break;
}
- panic("didn't expect %+F to have mode_b", node);
-}
+ case iro_Unknown:
+ res = new_r_Unknown(irg, mode);
+ break;
-static ir_node *create_convb(ir_node *node)
-{
- ir_graph *irg = current_ir_graph;
- ir_node *block = get_nodes_block(node);
- ir_node *conv = new_rd_Conv(NULL, irg, block, node, mode_b);
+ default:
+ panic("didn't expect %+F to have mode_b", node);
+ }
- return conv;
+ pdeq_putr(lowered_nodes, node);
+own_replacement:
+ set_irn_link(node, res);
+ return res;
}
static void lower_mode_b_walker(ir_node *node, void *env)
{
int i, arity;
- (void) env;
+ bool changed = false;
arity = get_irn_arity(node);
- for(i = 0; i < arity; ++i) {
+ for (i = 0; i < arity; ++i) {
ir_node *lowered_in;
ir_node *in = get_irn_n(node, i);
- if(get_irn_mode(in) != mode_b)
+ if (get_irn_mode(in) != mode_b)
continue;
- if(! lower_direct_cmp) {
- if(is_Cond(node)
- || (is_Psi(node) && get_irn_mode(node) != mode_b)) {
- if(is_Proj(in)) {
+ if (! config.lower_direct_cmp) {
+ /* Proj(Cmp) as input for Cond and Mux nodes needs no changes.
+ (Mux with mode_b is an exception as it gets replaced by and/or
+ anyway so we still lower the inputs then) */
+ if (is_Cond(node) ||
+ (is_Mux(node) && get_irn_mode(node) != mode_b)) {
+ if (is_Proj(in)) {
ir_node *pred = get_Proj_pred(in);
- if(is_Cmp(pred))
+ if (is_Cmp(pred))
continue;
}
}
}
lowered_in = lower_node(in);
- lowered_in = create_convb(lowered_in);
+
+ if (is_Call(node)) {
+ ir_type *type = get_Call_type(node);
+ adjust_method_type(type);
+ } else if (is_Cond(node) || (is_Mux(node) && i == 0)) {
+ lowered_in = create_convb(lowered_in);
+ }
set_irn_n(node, i, lowered_in);
+ changed = true;
+ }
+ if (changed) {
+ ir_graph *irg = get_irn_irg(node);
+ bool *global_changed = env;
+ *global_changed = true;
+ add_identities(irg->value_table, node);
}
}
-void ir_lower_mode_b(ir_graph *irg, ir_mode *mode, int do_lower_direct_cmp)
+void ir_lower_mode_b(ir_graph *irg, const lower_mode_b_config_t *nconfig)
{
- lowered_mode = mode;
- lower_direct_cmp = do_lower_direct_cmp;
- irg_walk_graph(irg, lower_mode_b_walker, NULL, NULL);
+ ir_entity *entity = get_irg_entity(irg);
+ ir_type *type = get_entity_type(entity);
+ bool changed = false;
+
+ config = *nconfig;
+ lowered_nodes = new_pdeq();
+ lowered_type = NULL;
+
+ edges_assure(irg);
+
+ /* ensure no optimisation touches muxes anymore */
+ set_irg_state(irg, IR_GRAPH_STATE_KEEP_MUX | IR_GRAPH_STATE_BCONV_ALLOWED);
+
+ ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK);
+
+ adjust_method_type(type);
+
+ set_opt_allow_conv_b(0);
+ irg_walk_graph(irg, firm_clear_link, NULL, NULL);
+ irg_walk_graph(irg, lower_mode_b_walker, NULL, &changed);
+
+ while (!pdeq_empty(lowered_nodes)) {
+ ir_node *node = (ir_node*) pdeq_getr(lowered_nodes);
+ maybe_kill_node(node);
+ }
+ del_pdeq(lowered_nodes);
+
+ ir_free_resources(irg, IR_RESOURCE_IRN_LINK);
+
+ if (changed) {
+ set_irg_outs_inconsistent(irg);
+ }
+}
+
+struct pass_t {
+ ir_graph_pass_t pass;
+ const lower_mode_b_config_t *config;
+};
+
+/**
+ * Wrapper to run ir_lower_mode_b() as an ir_graph pass
+ */
+static int pass_wrapper(ir_graph *irg, void *context)
+{
+ struct pass_t *pass = context;
+
+ ir_lower_mode_b(irg, pass->config);
+ return 0;
+}
+
+ir_graph_pass_t *ir_lower_mode_b_pass(
+ const char *name, const lower_mode_b_config_t *config)
+{
+ struct pass_t *pass = XMALLOCZ(struct pass_t);
+
+ pass->config = config;
+ return def_graph_pass_constructor(
+ &pass->pass, name ? name : "lower_mode_b", pass_wrapper);
}
projects / libfirm / blobdiff