X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Flower%2Flower_mode_b.c;h=f9a2b9bb99b19bae7106ae8b04f73417fe92cec8;hb=61c66f56e9a5b1d23bb679077bf2f9350ff7594e;hp=50c1b4271c9d9fb6e24e5dd3dc209bf64b81ea77;hpb=9baf0cd6e299828073f897e4bd0a284379ad9cdb;p=libfirm

diff --git a/ir/lower/lower_mode_b.c b/ir/lower/lower_mode_b.c
index 50c1b4271..f9a2b9bb9 100644
--- a/ir/lower/lower_mode_b.c
+++ b/ir/lower/lower_mode_b.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 1995-2007 University of Karlsruhe.  All right reserved.
+ * Copyright (C) 1995-2011 University of Karlsruhe.  All right reserved.
  *
  * This file is part of libFirm.
  *
@@ -19,285 +19,288 @@
 
 /**
  * @file
+ * @brief       lower mode_b operations to something the backend can handle
  * @author      Matthias Braun, Christoph Mallon
- * @version     $Id$
  */
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
+
+#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"
+#include "irgopt.h"
+
+typedef struct needs_lowering_t {
+	ir_node *node;
+	int      input;
+} needs_lowering_t;
 
-static ir_mode *lowered_mode     = NULL;
-static int      lower_direct_cmp = 0;
+static ir_mode          *lowered_mode;
+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);
-	tarval   *tv_one = get_tarval_one(lowered_mode);
-	ir_node  *one    = new_d_Const(dbgi, lowered_mode, tv_one);
+	ir_node   *block  = get_nodes_block(node);
+	ir_mode   *mode   = 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);
+
+	return new_rd_Eor(dbgi, block, node, one, mode);
+}
 
-	return new_rd_Eor(dbgi,	irg, block, node, one, lowered_mode);
+static ir_node *convert_to_modeb(ir_node *node)
+{
+	ir_node   *block   = get_nodes_block(node);
+	ir_graph  *irg     = get_irn_irg(node);
+	ir_mode   *mode    = 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;
+}
+
+/**
+ * implementation of create_set_func which produces a cond with control
+ * flow
+ */
+static ir_node *create_cond_set(ir_node *cond_value, ir_mode *dest_mode)
+{
+	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_op    *op    = get_irn_op(node);
 	ir_node  *block = get_nodes_block(node);
-	ir_node  *res;
-
-	assert(get_irn_mode(node) == mode_b);
+	ir_mode  *mode  = 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... */
-	if(op == op_Phi) {
+	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    = alloca(arity * sizeof(in[0]));
-		unknown = new_Unknown(lowered_mode);
-		for(i = 0; i < arity; ++i) {
-			in[i] = unknown;
+		in    = ALLOCAN(ir_node*, arity);
+		dummy = new_r_Dummy(irg, mode);
+		for (i = 0; i < arity; ++i) {
+			in[i] = dummy;
 		}
-		new_phi = new_rd_Phi(dbgi, irg, block, arity, in,
-		                              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);
 
-		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;
 	}
 
-	if(op == op_And || op == op_Or || op == op_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, lowered_mode);
-
-		set_irn_link(node, copy);
-		return copy;
+	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;
 	}
-	if(op == op_Not) {
+	case iro_Eor: {
+		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);
-		return res;
+		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, irg, block, not_cond, low_v_false,
-		                               lowered_mode);
-
-		ir_node *or       = new_rd_Or(dbgi, irg, block, and0, and1,
-		                              lowered_mode);
-
-		set_irn_link(node, or);
-		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);
-
-		set_irn_link(node, psi);
-		return psi;
+		ir_node *and1     = new_rd_And(dbgi, block, not_cond, low_v_false, mode);
+		res = new_rd_Or(dbgi, block, and0, and1, mode);
+		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);
-			ir_node *left  = get_Cmp_left(pred);
-			ir_node *right = get_Cmp_right(pred);
-
-			if( (mode_is_int(mode) || mode_is_reference(mode)) &&
-				(get_mode_size_bits(mode) < get_mode_size_bits(lowered_mode)
-			         || classify_Const(right) == CNST_NULL)) {
-				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) ^ 1 */
-					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) ^ 1 */
-					a        = left;
-					b        = right;
-					need_not = 1;
-				}
-
-				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);
-
-					if(need_not) {
-						res = create_not(dbgi, res);
-					}
-					set_irn_link(node, res);
-					return res;
-				}
-			}
-
-			{
-			/* 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);
-
-			set_irn_link(node, psi);
-			return psi;
-			}
-		}
 
-		panic("unexpected projb: %+F (pred: %+F)", node, pred);
-	}
-	if(op == op_Const) {
-		tarval *tv = get_Const_tarval(node);
-		if(tv == get_tarval_b_true()) {
-			tarval  *tv_one  = get_tarval_one(lowered_mode);
-			res              = new_d_Const(dbgi, lowered_mode, tv_one);
-		} else if(tv == get_tarval_b_false()) {
-			tarval  *tv_zero = get_tarval_null(lowered_mode);
-			res              = new_d_Const(dbgi, lowered_mode, tv_zero);
+	case iro_Cmp:
+		res = create_cond_set(node, mode);
+		break;
+
+	case iro_Const: {
+		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);
-		return res;
+		break;
+	}
+
+	case iro_Unknown:
+		res = new_r_Unknown(irg, mode);
+		break;
+
+	case iro_Bad:
+		res = new_r_Bad(irg, mode);
+		break;
+
+	default:
+		panic("Don't know how to lower mode_b node %+F", node);
 	}
 
-	panic("didn't expect %+F to have mode_b", node);
+	set_irn_link(node, res);
+	return res;
 }
 
-static ir_node *create_convb(ir_node *node)
+static bool needs_mode_b_input(const ir_node *node, int input)
 {
-	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;
+	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)
+ */
+static void collect_needs_lowering(ir_node *node, void *env)
 {
-	int i, arity;
+	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 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(! lower_direct_cmp) {
-			if(is_Cond(node)
-					|| (is_Psi(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);
-		lowered_in = create_convb(lowered_in);
-		set_irn_n(node, i, lowered_in);
+		entry.node  = node;
+		entry.input = i;
+		ARR_APP1(needs_lowering_t, needs_lowering, entry);
 	}
 }
 
-static void clear_links(ir_node *node, void *env)
+void ir_lower_mode_b(ir_graph *const irg, ir_mode *const nlowered_mode)
 {
-	(void) env;
-	set_irn_link(node, NULL);
-}
+	size_t i;
+	size_t n;
 
-void ir_lower_mode_b(ir_graph *irg, ir_mode *mode, int do_lower_direct_cmp)
-{
-	lowered_mode     = mode;
-	lower_direct_cmp = do_lower_direct_cmp;
-	set_using_irn_link(irg);
-	irg_walk_graph(irg, clear_links, NULL, NULL);
-	irg_walk_graph(irg, lower_mode_b_walker, NULL, NULL);
-	clear_using_irn_link(irg);
+	lowered_mode = nlowered_mode;
+
+	/* edges are used by part_block_edges in the ir_create_cond_set variant. */
+	assure_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUT_EDGES
+	                         | IR_GRAPH_PROPERTY_NO_TUPLES);
+
+	add_irg_constraints(irg, IR_GRAPH_CONSTRAINT_MODEB_LOWERED);
+	ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK);
+
+	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);
+
+		if (needs_mode_b_input(node, input))
+			lowered = convert_to_modeb(lowered);
+		set_irn_n(node, input, lowered);
+	}
+
+	ir_free_resources(irg, IR_RESOURCE_IRN_LINK);
+
+	DEL_ARR_F(needs_lowering);
+
+	confirm_irg_properties(irg, n > 0 ? IR_GRAPH_PROPERTIES_NONE : IR_GRAPH_PROPERTIES_ALL);
 }