/*
- * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
+ * Copyright (C) 1995-2011 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.
+ * @brief lower mode_b operations to something the backend can handle
* @author Matthias Braun, Christoph Mallon
* @version $Id$
*/
#include "config.h"
+#include "lower_mode_b.h"
+
#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 "irgmod.h"
#include "tv.h"
#include "error.h"
#include "lowering.h"
#include "pdeq.h"
+#include "irpass_t.h"
+#include "util.h"
+#include "array.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;
-
- 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_Bad());
- }
- set_nodes_block(node, new_Bad());
+typedef struct needs_lowering_t {
+ ir_node *node;
+ int input;
+} needs_lowering_t;
- edges_node_deleted(node, irg);
-}
+static const lower_mode_b_config_t *config;
+static needs_lowering_t *needs_lowering;
static ir_node *create_not(dbg_info *dbgi, ir_node *node)
{
- ir_graph *irg = current_ir_graph;
- ir_node *block = get_nodes_block(node);
- ir_mode *mode = config.lowered_mode;
- tarval *tv_one = get_tarval_one(mode);
- ir_node *one = new_d_Const(dbgi, mode, tv_one);
-
- return new_rd_Eor(dbgi, irg, block, node, one, mode);
-}
-
-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);
-
- return conv;
-}
+ ir_node *block = get_nodes_block(node);
+ ir_mode *mode = config->lowered_mode;
+ ir_tarval *tv_one = get_mode_one(mode);
+ ir_graph *irg = get_irn_irg(node);
+ ir_node *one = new_rd_Const(dbgi, irg, tv_one);
-static ir_type *create_lowered_type(void)
-{
- if(lowered_type == NULL) {
- lowered_type = new_type_primitive(new_id_from_str("__lowered_mode_b"),
- config.lowered_mode);
- }
- return lowered_type;
+ return new_rd_Eor(dbgi, block, node, one, mode);
}
-/**
- * creates a "set" node that produces a 0 or 1 based on a Cmp result
- */
-static ir_node *create_set(ir_node *node)
+static ir_node *convert_to_modeb(ir_node *node)
{
- ir_graph *irg = current_ir_graph;
- dbg_info *dbgi = get_irn_dbg_info(node);
- ir_mode *mode = config.lowered_set_mode;
- tarval *tv_one = get_tarval_one(mode);
- ir_node *one = new_d_Const(dbgi, mode, tv_one);
- ir_node *block = get_nodes_block(node);
- tarval *tv_zero = get_tarval_null(mode);
- ir_node *zero = new_d_Const(dbgi, mode, tv_zero);
-
- ir_node *set = new_rd_Mux(dbgi, irg, block, node, zero, one, mode);
-
- if (mode != config.lowered_mode) {
- set = new_r_Conv(irg, block, set, config.lowered_mode);
- }
-
- return set;
+ ir_node *block = get_nodes_block(node);
+ ir_graph *irg = get_irn_irg(node);
+ ir_mode *mode = config->lowered_mode;
+ ir_tarval *tv_zero = get_mode_null(mode);
+ ir_node *zero = new_r_Const(irg, tv_zero);
+ ir_node *cmp = new_r_Cmp(block, node, zero, ir_relation_less_greater);
+ return cmp;
}
-static void adjust_method_type(ir_type *method_type)
+ir_node *ir_create_cond_set(ir_node *cond_value, ir_mode *dest_mode)
{
- 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());
- }
- }
+ ir_node *lower_block = part_block_edges(cond_value);
+ ir_node *upper_block = get_nodes_block(cond_value);
+ ir_graph *irg = get_irn_irg(cond_value);
+ ir_node *cond = new_r_Cond(upper_block, cond_value);
+ ir_node *proj_true = new_r_Proj(cond, mode_X, pn_Cond_true);
+ ir_node *proj_false = new_r_Proj(cond, mode_X, pn_Cond_false);
+ ir_node *in_true[1] = { proj_true };
+ ir_node *in_false[1] = { proj_false };
+ ir_node *true_block = new_r_Block(irg, ARRAY_SIZE(in_true), in_true);
+ ir_node *false_block = new_r_Block(irg, ARRAY_SIZE(in_false),in_false);
+ ir_node *true_jmp = new_r_Jmp(true_block);
+ ir_node *false_jmp = new_r_Jmp(false_block);
+ ir_node *lower_in[2] = { true_jmp, false_jmp };
+ ir_node *one = new_r_Const(irg, get_mode_one(dest_mode));
+ ir_node *zero = new_r_Const(irg, get_mode_null(dest_mode));
+ ir_node *phi_in[2] = { one, zero };
+ ir_node *phi;
+
+ set_irn_in(lower_block, ARRAY_SIZE(lower_in), lower_in);
+ phi = new_r_Phi(lower_block, ARRAY_SIZE(phi_in), phi_in, dest_mode);
+
+ return phi;
}
static ir_node *lower_node(ir_node *node)
{
- ir_graph *irg = current_ir_graph;
dbg_info *dbgi = get_irn_dbg_info(node);
ir_node *block = get_nodes_block(node);
- ir_mode *mode = config.lowered_mode;
- ir_node *res;
-
- assert(get_irn_mode(node) == mode_b);
+ ir_mode *mode = config->lowered_mode;
+ ir_node *res = (ir_node*)get_irn_link(node);
+ ir_graph *irg;
- res = get_irn_link(node);
- if(res != NULL)
+ if (res != NULL)
return res;
- /* TODO: be robust against phi-loops... */
+ node = skip_Tuple(node);
+
+ assert(get_irn_mode(node) == mode_b);
+
+ irg = get_irn_irg(node);
switch (get_irn_opcode(node)) {
case iro_Phi: {
int i, arity;
ir_node **in;
- ir_node *unknown, *new_phi;
+ ir_node *dummy;
+ ir_node *new_phi;
- arity = get_irn_arity(node);
- in = ALLOCAN(ir_node*, arity);
- unknown = new_Unknown(config.lowered_mode);
- for(i = 0; i < arity; ++i) {
- in[i] = unknown;
+ arity = get_irn_arity(node);
+ in = ALLOCAN(ir_node*, arity);
+ dummy = new_r_Dummy(irg, mode);
+ for (i = 0; i < arity; ++i) {
+ in[i] = dummy;
}
- new_phi = new_r_Phi(irg, block, arity, in, config.lowered_mode);
+ 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);
+ for (i = 0; i < arity; ++i) {
+ ir_node *in = get_irn_n(node, i);
+ ir_node *lowered_in = lower_node(in);
- set_irn_n(new_phi, i, low_in);
+ set_irn_n(new_phi, i, lowered_in);
}
return new_phi;
}
- case iro_And:
- case iro_Or:
+ case iro_And: {
+ ir_node *lowered_left = lower_node(get_And_left(node));
+ ir_node *lowered_right = lower_node(get_And_right(node));
+ res = new_rd_And(dbgi, block, lowered_left, lowered_right, mode);
+ break;
+ }
+ case iro_Or: {
+ ir_node *lowered_left = lower_node(get_Or_left(node));
+ ir_node *lowered_right = lower_node(get_Or_right(node));
+ res = new_rd_Or(dbgi, block, lowered_left, lowered_right, mode);
+ break;
+ }
case iro_Eor: {
- int i, arity;
- ir_node *copy = exact_copy(node);
-
- arity = get_irn_arity(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(copy, i, low_in);
- }
- set_irn_mode(copy, config.lowered_mode);
-
- set_irn_link(node, copy);
- pdeq_putr(lowered_nodes, node);
- return copy;
+ ir_node *lowered_left = lower_node(get_Eor_left(node));
+ ir_node *lowered_right = lower_node(get_Eor_right(node));
+ res = new_rd_Eor(dbgi, block, lowered_left, lowered_right, mode);
+ break;
}
+
case iro_Not: {
ir_node *op = get_Not_op(node);
ir_node *low_op = lower_node(op);
res = create_not(dbgi, low_op);
- set_irn_link(node, res);
- pdeq_putr(lowered_nodes, node);
- return res;
+ break;
}
+
case iro_Mux: {
ir_node *cond = get_Mux_sel(node);
ir_node *low_cond = lower_node(cond);
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, low_cond, low_v_true, 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, irg, block, not_cond, low_v_false, mode);
- ir_node *or = new_rd_Or(dbgi, irg, block, and0, and1, mode);
-
- set_irn_link(node, or);
- pdeq_putr(lowered_nodes, node);
- return or;
- }
- case iro_Conv: {
- ir_node *pred = get_Conv_op(node);
- ir_mode *mode = get_irn_mode(pred);
- tarval *tv_zeroc = get_tarval_null(mode);
- ir_node *zero_cmp = new_d_Const(dbgi, mode, tv_zeroc);
- ir_node *set;
-
- ir_node *cmp = new_rd_Cmp(dbgi, irg, block, pred, zero_cmp);
- ir_node *proj = new_rd_Proj(dbgi, irg, block, cmp, mode_b,
- pn_Cmp_Lg);
- set = create_set(proj);
-
- set_irn_link(node, set);
- pdeq_putr(lowered_nodes, node);
- return set;
+ ir_node *and1 = new_rd_And(dbgi, block, not_cond, low_v_false, mode);
+ res = new_rd_Or(dbgi, block, and0, and1, mode);
+ break;
}
- 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);
- ir_node *set;
-
- 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);
- int need_not = 0;
- ir_node *a = NULL;
- ir_node *b = NULL;
-
- 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 */
- a = right;
- b = left;
- need_not = 1;
- } 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 */
- a = left;
- b = right;
- need_not = 1;
- }
-
- if(a != NULL) {
- int bits = get_mode_size_bits(mode);
- tarval *tv = new_tarval_from_long(bits-1, mode_Iu);
- ir_node *shift_cnt = new_d_Const(dbgi, mode_Iu, tv);
-
- if(cmp_mode != mode) {
- a = new_rd_Conv(dbgi, irg, block, a, mode);
- b = new_rd_Conv(dbgi, irg, block, b, mode);
- }
-
- res = new_rd_Sub(dbgi, irg, block, a, b, mode);
- if(need_not) {
- res = new_rd_Not(dbgi, irg, block, res, mode);
- }
- res = new_rd_Shr(dbgi, irg, block, res, shift_cnt, mode);
-
- set_irn_link(node, res);
- pdeq_putr(lowered_nodes, node);
- return res;
- }
+
+ case iro_Cmp: {
+ ir_node *left = get_Cmp_left(node);
+ ir_node *right = get_Cmp_right(node);
+ ir_mode *cmp_mode = get_irn_mode(left);
+ ir_relation relation = get_Cmp_relation(node);
+
+ 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) && relation != ir_relation_greater))) {
+ int need_not = 0;
+ ir_node *a = NULL;
+ ir_node *b = NULL;
+ int bits;
+ ir_tarval *tv;
+ ir_node *shift_cnt;
+
+ if (relation == ir_relation_less) {
+ /* a < b -> (a - b) >> 31 */
+ a = left;
+ b = right;
+ } else if (relation == ir_relation_less_equal) {
+ /* a <= b -> ~(a - b) >> 31 */
+ a = right;
+ b = left;
+ need_not = 1;
+ } else if (relation == ir_relation_greater) {
+ /* a > b -> (b - a) >> 31 */
+ a = right;
+ b = left;
+ } else if (relation == ir_relation_greater_equal) {
+ /* a >= b -> ~(a - b) >> 31 */
+ a = left;
+ b = right;
+ need_not = 1;
+ } else {
+ goto synth_zero_one;
+ }
+
+ bits = get_mode_size_bits(mode);
+ tv = new_tarval_from_long(bits-1, mode_Iu);
+ shift_cnt = new_rd_Const(dbgi, irg, tv);
+
+ if (cmp_mode != mode) {
+ a = new_rd_Conv(dbgi, block, a, mode);
+ b = new_rd_Conv(dbgi, block, b, mode);
}
+ 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 */
- set = create_set(node);
- set_irn_link(node, set);
- pdeq_putr(lowered_nodes, node);
- return set;
- } 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);
- return node;
- } else if(is_Proj(pred) && is_Start(get_Proj_pred(pred))) {
- ir_entity *entity = get_irg_entity(irg);
- ir_type *type = get_entity_type(entity);
- adjust_method_type(type);
- set_irn_mode(node, mode);
- return node;
+synth_zero_one:
+ res = config->create_set(node);
}
-
- panic("unexpected projb: %+F (pred: %+F)", node, pred);
+ break;
}
+
case iro_Const: {
- tarval *tv = get_Const_tarval(node);
- if(tv == get_tarval_b_true()) {
- tarval *tv_one = get_tarval_one(mode);
- res = new_d_Const(dbgi, mode, tv_one);
- } else if(tv == get_tarval_b_false()) {
- tarval *tv_zero = get_tarval_null(mode);
- res = new_d_Const(dbgi, mode, tv_zero);
+ ir_tarval *tv = get_Const_tarval(node);
+ if (tv == get_tarval_b_true()) {
+ ir_tarval *tv_one = get_mode_one(mode);
+ res = new_rd_Const(dbgi, irg, tv_one);
+ } else if (tv == get_tarval_b_false()) {
+ ir_tarval *tv_zero = get_mode_null(mode);
+ res = new_rd_Const(dbgi, irg, tv_zero);
} else {
panic("invalid boolean const %+F", node);
}
- set_irn_link(node, res);
- pdeq_putr(lowered_nodes, node);
- return res;
+ break;
}
+
case iro_Unknown:
- return new_Unknown(config.lowered_mode);
+ res = new_r_Unknown(irg, mode);
+ break;
+
+ case iro_Bad:
+ res = new_r_Bad(irg, mode);
+ break;
+
default:
- panic("didn't expect %+F to have mode_b", node);
+ panic("Don't know how to lower mode_b node %+F", node);
}
+
+ set_irn_link(node, res);
+ return res;
+}
+
+static bool needs_mode_b_input(const ir_node *node, int input)
+{
+ return (is_Cond(node) && input == n_Cond_selector)
+ || (is_Mux(node) && input == n_Mux_sel);
}
-static void lower_mode_b_walker(ir_node *node, void *env)
+/**
+ * Collects "roots" of a mode_b calculation. These are nodes which require a
+ * mode_b input (Cond, Mux, Conv(xxx_b))
+ */
+static void collect_needs_lowering(ir_node *node, void *env)
{
- int i, arity;
- int changed = 0;
+ int arity = get_irn_arity(node);
+ int i;
(void) env;
- arity = get_irn_arity(node);
- for(i = 0; i < arity; ++i) {
- ir_node *lowered_in;
+ /* if the node produces mode_b then it is a not a root (but should be
+ * something our lower_node function can handle) */
+ if (get_irn_mode(node) == mode_b) {
+ assert(is_And(node) || is_Or(node) || is_Eor(node) || is_Phi(node)
+ || is_Not(node) || is_Mux(node) || is_Cmp(node)
+ || is_Const(node) || is_Unknown(node) || is_Bad(node));
+ return;
+ }
+
+ for (i = 0; i < arity; ++i) {
+ needs_lowering_t entry;
ir_node *in = get_irn_n(node, i);
- if(get_irn_mode(in) != mode_b)
+ if (get_irn_mode(in) != mode_b)
+ continue;
+ if (is_Cmp(in) && needs_mode_b_input(node, i))
continue;
- if(! config.lower_direct_cmp) {
- 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))
- continue;
- }
- }
- }
-
- lowered_in = lower_node(in);
-
- if(is_Return(node)) {
- ir_entity *entity = get_irg_entity(current_ir_graph);
- ir_type *type = get_entity_type(entity);
- adjust_method_type(type);
- } else if(is_Call(node)) {
- ir_type *type = get_Call_type(node);
- adjust_method_type(type);
- } else {
- lowered_in = create_convb(lowered_in);
- }
- set_irn_n(node, i, lowered_in);
- changed = 1;
+ entry.node = node;
+ entry.input = i;
+ ARR_APP1(needs_lowering_t, needs_lowering, entry);
}
- if(changed) {
- add_identities(current_ir_graph->value_table, node);
- }
-}
-
-static void clear_links(ir_node *node, void *env)
-{
- (void) env;
- set_irn_link(node, NULL);
}
void ir_lower_mode_b(ir_graph *irg, const lower_mode_b_config_t *nconfig)
{
- config = *nconfig;
- lowered_nodes = new_pdeq();
+ size_t i;
+ size_t n;
+
+ config = nconfig;
+ /* edges are used by part_block_edges in the ir_create_cond_set variant. */
+ edges_assure(irg);
+
+ set_irg_state(irg, IR_GRAPH_STATE_MODEB_LOWERED);
ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK);
- irg_walk_graph(irg, clear_links, NULL, NULL);
- irg_walk_graph(irg, lower_mode_b_walker, NULL, NULL);
+ needs_lowering = NEW_ARR_F(needs_lowering_t, 0);
+
+ irg_walk_graph(irg, firm_clear_link, collect_needs_lowering, NULL);
+
+ n = ARR_LEN(needs_lowering);
+ for (i = 0; i < n; ++i) {
+ const needs_lowering_t *entry = &needs_lowering[i];
+ ir_node *node = entry->node;
+ int input = entry->input;
+ ir_node *in = get_irn_n(node, input);
+ ir_node *lowered = lower_node(in);
- while(!pdeq_empty(lowered_nodes)) {
- ir_node *node = (ir_node*) pdeq_getr(lowered_nodes);
- maybe_kill_node(node);
+ if (needs_mode_b_input(node, input))
+ lowered = convert_to_modeb(lowered);
+ set_irn_n(node, input, lowered);
}
- del_pdeq(lowered_nodes);
ir_free_resources(irg, IR_RESOURCE_IRN_LINK);
+
+ DEL_ARR_F(needs_lowering);
+
+ if (n > 0) {
+ /* lowering might create new blocks, so be sure to handle this */
+ set_irg_extblk_inconsistent(irg);
+ clear_irg_state(irg, IR_GRAPH_STATE_CONSISTENT_DOMINANCE);
+ edges_deactivate(irg);
+ }
}
projects / libfirm / blobdiff