-/* Copyright (C) 2002 by Universitaet Karlsruhe
-* All rights reserved.
-*
-* Authors: Goetz Lindenmaier
-*
-* irscc.c Computing the strongly connected regions and building
-* backedge/loop datastructures.
-*
-*/
-
-/* $Id$ */
+/*
+ * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
+ *
+ * This file is part of libFirm.
+ *
+ * This file may be distributed and/or modified under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation and appearing in the file LICENSE.GPL included in the
+ * packaging of this file.
+ *
+ * Licensees holding valid libFirm Professional Edition licenses may use
+ * this file in accordance with the libFirm Commercial License.
+ * Agreement provided with the Software.
+ *
+ * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+ * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
+ */
+
+/**
+ * @file
+ * @brief Compute the strongly connected regions and build
+ * backedge/loop datastructures.
+ * A variation on the Tarjan algorithm. See also [Trapp:99],
+ * Chapter 5.2.1.2.
+ * @author Goetz Lindenmaier
+ * @date 7.2002
+ * @version $Id$
+ */
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
-#include <string.h>
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif
+#ifdef HAVE_STDLIB_H
+# include <stdlib.h>
+#endif
#include "irloop_t.h"
-#include "irnode.h"
+
+#include "irprog_t.h"
#include "irgraph_t.h"
-#include "array.h"
-#include "xprintf.h"
+#include "irnode_t.h"
#include "irgwalk.h"
-#include "irprog.h"
-
-ir_graph *outermost_ir_graph; /* The outermost graph the scc is computed
- for */
-static ir_loop *current_loop; /* Current loop construction is working
- on. */
-static int loop_node_cnt = 0; /* Counts the number of allocated loop nodes.
- Each loop node gets a unique number.
- What for? ev. remove. @@@ */
-static int current_dfn = 1; /* Counter to generate depth first numbering
- of visited nodes. */
+#include "irdump.h"
+#include "array.h"
+#include "pmap.h"
+
+/* A variant of the loop tree that avoids loops without head.
+ This reduces the depth of the loop tree. */
+#define NO_LOOPS_WITHOUT_HEAD 1
+
+/** The outermost graph the scc is computed for. */
+static ir_graph *outermost_ir_graph;
+/** Current loop construction is working on. */
+static ir_loop *current_loop;
+/** Counts the number of allocated loop nodes.
+ * Each loop node gets a unique number.
+ * @todo What for? ev. remove.
+ */
+static int loop_node_cnt = 0;
+/** Counter to generate depth first numbering of visited nodes. */
+static int current_dfn = 1;
+
+static int max_loop_depth = 0;
+
+void link_to_reg_end(ir_node *n, void *env);
+void set_projx_link(ir_node *cb_projx, ir_node *end_projx);
+ir_node *get_projx_link(ir_node *cb_projx);
+
+/**********************************************************************/
+/* Node attributes **/
+/**********************************************************************/
/**********************************************************************/
/* Node attributes needed for the construction. **/
/**********************************************************************/
typedef struct scc_info {
- bool in_stack; /* Marks whether node is on the stack. */
- int dfn; /* Depth first search number. */
- int uplink; /* dfn number of ancestor. */
- ir_loop *loop; /* Refers to the containing loop. */
- /*
- struct section *section;
- xset def;
- xset use;
- */
+ int in_stack; /**< Marks whether node is on the stack. */
+ int dfn; /**< Depth first search number. */
+ int uplink; /**< dfn number of ancestor. */
+ /* ir_loop *loop; *//* Refers to the containing loop. */
+ /*
+ struct section *section;
+ xset def;
+ xset use;
+ */
} scc_info;
-static INLINE scc_info* new_scc_info(void) {
- scc_info *info = obstack_alloc (outermost_ir_graph->obst, sizeof (scc_info));
- memset (info, 0, sizeof (scc_info));
- return info;
+/**
+ * Allocates a new SCC info on the given obstack.
+ */
+static INLINE scc_info *new_scc_info(struct obstack *obst) {
+ scc_info *info = obstack_alloc(obst, sizeof(*info));
+ memset(info, 0, sizeof(*info));
+ return info;
}
-static INLINE void
-mark_irn_in_stack (ir_node *n) {
- assert(get_irn_link(n));
- ((scc_info *)get_irn_link(n))->in_stack = true;
+/**
+ * Mark node n being on the SCC stack.
+ */
+static INLINE void mark_irn_in_stack(ir_node *n) {
+ scc_info *scc = get_irn_link(n);
+ assert(scc);
+ scc->in_stack = 1;
}
-static INLINE void
-mark_irn_not_in_stack (ir_node *n) {
- assert(get_irn_link(n));
- ((scc_info *)get_irn_link(n))->in_stack = false;
-}
-
-static INLINE bool
-irn_is_in_stack (ir_node *n) {
- assert(get_irn_link(n));
- return ((scc_info *)get_irn_link(n))->in_stack;
+/**
+* Mark node n NOT being on the SCC stack.
+*/
+static INLINE void mark_irn_not_in_stack(ir_node *n) {
+ scc_info *scc = get_irn_link(n);
+ assert(scc);
+ scc->in_stack = 0;
}
-static INLINE void
-set_irn_uplink (ir_node *n, int uplink) {
- assert(get_irn_link(n));
- ((scc_info *)get_irn_link(n))->uplink = uplink;
+/**
+ * Checks if a node is on the SCC stack.
+ */
+static INLINE int irn_is_in_stack(ir_node *n) {
+ scc_info *scc = get_irn_link(n);
+ assert(scc);
+ return scc->in_stack;
}
-static INLINE int
-get_irn_uplink (ir_node *n) {
- assert(get_irn_link(n));
- return ((scc_info *)get_irn_link(n))->uplink;
+/**
+ * Sets the uplink number for a node.
+ */
+static INLINE void set_irn_uplink(ir_node *n, int uplink) {
+ scc_info *scc = get_irn_link(n);
+ assert(scc);
+ scc->uplink = uplink;
}
-static INLINE void
-set_irn_dfn (ir_node *n, int dfn) {
- if (! get_irn_link(n)) { DDMN(n); DDME(get_irg_ent(current_ir_graph));}
- assert(get_irn_link(n));
- ((scc_info *)get_irn_link(n))->dfn = dfn;
+/**
+ * Returns the uplink number for a node.
+ */
+static int get_irn_uplink(ir_node *n) {
+ scc_info *scc = get_irn_link(n);
+ assert(scc);
+ return scc->uplink;
}
-static INLINE int
-get_irn_dfn (ir_node *n) {
- assert(get_irn_link(n));
- return ((scc_info *)get_irn_link(n))->dfn;
+/**
+ * Sets the depth-first-search number for a node.
+ */
+static INLINE void set_irn_dfn(ir_node *n, int dfn) {
+ scc_info *scc = get_irn_link(n);
+ assert(scc);
+ scc->dfn = dfn;
}
-/* Uses temporary information to set the loop */
-static INLINE void
-set_irn_loop_tmp (ir_node *n, ir_loop* loop) {
- assert(get_irn_link(n));
- ((scc_info *)get_irn_link(n))->loop = loop;
+/**
+ * Returns the depth-first-search number of a node.
+ */
+static int get_irn_dfn(ir_node *n) {
+ scc_info *scc = get_irn_link(n);
+ assert(scc);
+ return scc->dfn;
}
#if 0
-/* Uses temporary information to get the loop */
-static INLINE ir_loop *
-get_irn_loop_tmp (ir_node *n) {
- assert(get_irn_link(n));
- return ((scc_info *)get_irn_link(n))->loop;
-}
-#endif
-
-static ir_loop *find_nodes_loop (ir_node *n, ir_loop *l) {
- int i;
- ir_loop *res = NULL;
-
- /* Test whether n is contained in this loop. */
- for (i = 0; i < get_loop_n_nodes(l); i++)
- if (n == get_loop_node(l, i)) return l;
-
- /* Is this a leave in the loop tree? If so loop not found. */
- if (get_loop_n_sons(l) == 0) return NULL;
-
- /* Else descend in the loop tree. */
- for (i = 0; i < get_loop_n_sons(l); i++) {
- res = find_nodes_loop(n, get_loop_son(l, i));
- if (res) break;
- }
- return res;
+static ir_loop *find_nodes_loop(ir_node *n, ir_loop *l) {
+ int i;
+ ir_loop *res = NULL;
+
+ /* Test whether n is contained in this loop. */
+ for (i = 0; i < get_loop_n_nodes(l); i++)
+ if (n == get_loop_node(l, i)) return l;
+
+ /* Is this a leave in the loop tree? If so loop not found. */
+ if (get_loop_n_sons(l) == 0) return NULL;
+
+ /* Else descend in the loop tree. */
+ for (i = 0; i < get_loop_n_sons(l); i++) {
+ res = find_nodes_loop(n, get_loop_son(l, i));
+ if (res) break;
+ }
+ return res;
}
/* @@@ temporary implementation, costly!!! */
ir_loop * get_irn_loop(ir_node *n) {
- ir_loop *l = get_irg_loop(current_ir_graph);
- l = find_nodes_loop(n, l);
- return l;
+ ir_loop *l = get_irg_loop(current_ir_graph);
+ l = find_nodes_loop(n, l);
+ return l;
}
+#endif
/**********************************************************************/
/* A stack. **/
static ir_node **stack = NULL;
static int tos = 0; /* top of stack */
+/**
+ * initializes the stack
+ */
static INLINE void init_stack(void) {
- if (stack) {
- ARR_RESIZE (ir_node *, stack, 1000);
- } else {
- stack = NEW_ARR_F (ir_node *, 1000);
- }
- tos = 0;
+ if (stack) {
+ ARR_RESIZE(ir_node *, stack, 1000);
+ } else {
+ stack = NEW_ARR_F(ir_node *, 1000);
+ }
+ tos = 0;
}
#if 0
+/**
+ * Frees the stack.
+ */
static INLINE void free_stack(void) {
- DEL_ARR_F(stack);
- stack = NULL;
- tos = 0;
+ if (stack != NULL) {
+ DEL_ARR_F(stack);
+ stack = NULL;
+ }
+ tos = 0;
}
#endif
-static INLINE void
-push (ir_node *n)
-{
- //DDMN(n);
+/**
+ * push a node onto the stack
+ *
+ * @param n The node to push
+ */
+static INLINE void push(ir_node *n) {
+ if (tos == ARR_LEN(stack)) {
+ int nlen = ARR_LEN(stack) * 2;
+ ARR_RESIZE(ir_node *, stack, nlen);
+ }
+ stack [tos++] = n;
+ mark_irn_in_stack(n);
+}
- if (tos == ARR_LEN (stack)) {
- int nlen = ARR_LEN (stack) * 2;
- ARR_RESIZE (ir_node *, stack, nlen);
- }
- stack [tos++] = n;
- mark_irn_in_stack(n);
+/**
+ * pop a node from the stack
+ *
+ * @return The topmost node
+ */
+static INLINE ir_node *pop(void) {
+ ir_node *n = stack[--tos];
+ mark_irn_not_in_stack(n);
+ return n;
}
-static INLINE ir_node *
-pop (void)
-{
- ir_node *n = stack[--tos];
- mark_irn_not_in_stack(n);
- return n;
+/**
+ * The nodes up to n belong to the current loop.
+ * Removes them from the stack and adds them to the current loop.
+ */
+static INLINE void pop_scc_to_loop(ir_node *n) {
+ ir_node *m;
+ int i = 0;
+
+ do {
+ m = pop();
+
+ loop_node_cnt++;
+ set_irn_dfn(m, loop_node_cnt);
+ add_loop_node(current_loop, m);
+ set_irn_loop(m, current_loop);
+ ++i;
+ } while (m != n);
+
+ /* i might be bigger than 1 for dead (and that's why bad) loops */
+ /* if(i > 1)
+ printf("Mehr als eine Iteration!!!!!!!!!!!!!!!!!!!!!!!!!!!!11111\n");
+ */
}
-/* The nodes up to n belong to the current loop.
- Removes them from the stack and adds them to the current loop. */
-static INLINE void
-pop_scc_to_loop (ir_node *n)
-{
- ir_node *m;
+/* GL ??? my last son is my grandson??? Removes loops with no
+ ir_nodes in them. Such loops have only another loop as son. (Why
+ can't they have two loops as sons? Does it never get that far? ) */
+static void close_loop(ir_loop *l) {
+ int last = get_loop_n_elements(l) - 1;
+ loop_element lelement = get_loop_element(l, last);
+ ir_loop *last_son = lelement.son;
+
+ if (get_kind(last_son) == k_ir_loop &&
+ get_loop_n_elements(last_son) == 1) {
+ ir_loop *gson;
- for (;;) {
- m = pop();
- set_irn_dfn(m, loop_node_cnt);
- loop_node_cnt++;
- add_loop_node(current_loop, m);
- set_irn_loop_tmp(m, current_loop);
- if (m==n) break;
- }
+ lelement = get_loop_element(last_son, 0);
+ gson = lelement.son;
+
+ if (get_kind(gson) == k_ir_loop) {
+ loop_element new_last_son;
+
+ gson->outer_loop = l;
+ new_last_son.son = gson;
+ l->children[last] = new_last_son;
+ }
+ }
+
+ current_loop = l;
}
/* Removes and unmarks all nodes up to n from the stack.
The nodes must be visited once more to assign them to a scc. */
-static INLINE void
-pop_scc_unmark_visit (ir_node *n)
-{
- ir_node *m = NULL;
+static INLINE void pop_scc_unmark_visit(ir_node *n) {
+ ir_node *m = NULL;
- while (m != n) {
- m = pop();
- set_irn_visited(m, 0);
- }
+ while (m != n) {
+ m = pop();
+ set_irn_visited(m, 0);
+ }
}
/**********************************************************************/
/* Allocates a new loop as son of current_loop. Sets current_loop
to the new loop and returns the father. */
-static ir_loop *new_loop (void) {
- ir_loop *father, *son;
+static ir_loop *new_loop(void) {
+ ir_loop *father = current_loop;
+ ir_loop *son = alloc_loop(father, outermost_ir_graph->obst);
+
+ if (son->depth > max_loop_depth) max_loop_depth = son->depth;
+ current_loop = son;
+ return father;
+}
+
+/**********************************************************************/
+/* Constructing and destructing the loop/backedge information. **/
+/**********************************************************************/
+
+/* Initialization steps. **********************************************/
- father = current_loop;
+static INLINE void init_node(ir_node *n, void *env) {
+ struct obstack *obst = env;
+ set_irn_link(n, new_scc_info(obst));
+ clear_backedges(n);
+}
- son = (ir_loop *) obstack_alloc (outermost_ir_graph->obst, sizeof (ir_loop));
- memset (son, 0, sizeof (ir_loop));
- son->kind = k_ir_loop;
- son->sons = NEW_ARR_F (ir_loop *, 0);
- son->nodes = NEW_ARR_F (ir_node *, 0);
- if (father) {
- son->outer_loop = father;
- add_loop_son(father, son);
- son->depth = father->depth+1;
- } else { /* The root loop */
- son->outer_loop = son;
- son->depth = 0;
- }
+static INLINE void init_scc_common(void) {
+ current_dfn = 1;
+ loop_node_cnt = 0;
+ init_stack();
+}
- current_loop = son;
- return father;
+static INLINE void init_scc(ir_graph *irg, struct obstack *obst) {
+ init_scc_common();
+ irg_walk_graph(irg, init_node, NULL, obst);
+ /*
+ irg_walk (irg, link_to_reg_end, NULL, NULL);
+ */
}
-#if 0
-/* Finishes the datastructures, copies the arrays to the obstack
- of current_ir_graph. */
-static void mature_loop (ir_loop *loop) {
- ir_loop **new_sons;
+#ifdef INTERPROCEDURAL_VIEW
+static INLINE void init_ip_scc(struct obstack *obst) {
+ init_scc_common();
+ cg_walk(init_node, NULL, obst);
- new_sons = NEW_ARR_D (ir_loop *, current_ir_graph->obst, ARR_LEN(loop->sons));
- memcpy (new_sons, loop->sons, sizeof (ir_loop *) * ARR_LEN(loop->sons));
- DEL_ARR_F(loop->sons);
- loop->sons = new_sons;
+#if EXPERIMENTAL_LOOP_TREE
+ cg_walk(link_to_reg_end, NULL, NULL);
+#endif
}
#endif
-/* Returns outer loop, itself if outermost. */
-ir_loop *get_loop_outer_loop (ir_loop *loop) {
- assert(loop && loop->kind == k_ir_loop);
- return loop->outer_loop;
+/**
+ * Check weather a given node represents the outer most Start
+ * block. In intra-procedural view this is the start block of the
+ * current graph, in interprocedural view it is the start block
+ * of the outer most graph.
+ *
+ * @param n the node to check
+ *
+ * This is the condition for breaking the scc recursion.
+ */
+static int is_outermost_Start(ir_node *n) {
+ /* Test whether this is the outermost Start node. */
+ if (is_Block(n) && get_Block_n_cfgpreds(n) == 1) {
+ ir_node *pred = skip_Proj(get_Block_cfgpred(n, 0));
+ if (is_Start(pred) && get_nodes_block(pred) == n)
+ return 1;
+ }
+ return 0;
}
-/* Returns nesting depth of this loop */
-int get_loop_depth (ir_loop *loop) {
- assert(loop); assert(loop->kind == k_ir_loop);
- return loop->depth;
+/* When to walk from nodes to blocks. Only for Control flow operations? */
+static INLINE int get_start_index(ir_node *n) {
+#undef BLOCK_BEFORE_NODE
+#define BLOCK_BEFORE_NODE 1
+
+#if BLOCK_BEFORE_NODE
+
+ /* This version assures, that all nodes are ordered absolutely. This allows
+ to undef all nodes in the heap analysis if the block is false, which means
+ not reachable.
+ I.e., with this code, the order on the loop tree is correct. But a (single)
+ test showed the loop tree is deeper. */
+ if (get_irn_op(n) == op_Phi ||
+ get_irn_op(n) == op_Block ||
+ (get_irn_op(n) == op_Filter && get_interprocedural_view()) ||
+ (get_irg_pinned(get_irn_irg(n)) == op_pin_state_floats &&
+ get_irn_pinned(n) == op_pin_state_floats))
+ // Here we could test for backedge at -1 which is illegal
+ return 0;
+ else
+ return -1;
+
+#else
+
+ /* This version causes deeper loop trees (at least we verified this
+ for Polymor).
+ But it guarantees that Blocks are analysed before nodes contained in the
+ block. If so, we can set the value to undef if the block is not \
+ executed. */
+ if (is_cfop(n) || is_fragile_op(n) || get_irn_op(n) == op_Start)
+ return -1;
+ else
+ return 0;
+
+#endif
}
-/* Returns the number of inner loops */
-int get_loop_n_sons (ir_loop *loop) {
- assert(loop && loop->kind == k_ir_loop);
- return ARR_LEN(loop->sons);
+/**
+ * Return non-zero if the given node is a legal loop header:
+ * Block, Phi, Filter.
+ *
+ * @param n the node to check
+ */
+static INLINE int is_possible_loop_head(ir_node *n) {
+ ir_op *op = get_irn_op(n);
+ return ((op == op_Block) ||
+ (op == op_Phi) ||
+ ((op == op_Filter) && get_interprocedural_view()));
}
-ir_loop *get_loop_son (ir_loop *loop, int pos) {
- assert(loop && loop->kind == k_ir_loop);
- return loop->sons[pos];
+
+/**
+ * Returns non-zero if n is a loop header, i.e., it is a Block, Phi
+ * or Filter node and has predecessors within the loop and out
+ * of the loop.
+ *
+ * @param n the node to check
+ * @param root only needed for assertion.
+ */
+static int is_head(ir_node *n, ir_node *root) {
+ int i, arity;
+ int some_outof_loop = 0, some_in_loop = 0;
+
+ /* Test for legal loop header: Block, Phi, ... */
+ if (!is_possible_loop_head(n))
+ return 0;
+
+ if (!is_outermost_Start(n)) {
+#ifndef NDEBUG
+ int uplink = get_irn_uplink(root);
+#endif
+ arity = get_irn_arity(n);
+ for (i = get_start_index(n); i < arity; i++) {
+ ir_node *pred;
+ if (is_backedge(n, i))
+ continue;
+ pred = get_irn_n(n, i);
+ if (! irn_is_in_stack(pred)) {
+ some_outof_loop = 1;
+ } else {
+ assert(get_irn_uplink(pred) >= uplink);
+ some_in_loop = 1;
+ }
+ }
+ }
+ return some_outof_loop & some_in_loop;
}
-static INLINE void
-add_loop_son(ir_loop *loop, ir_loop *son) {
- assert(loop && loop->kind == k_ir_loop);
- ARR_APP1 (ir_loop *, loop->sons, son);
+
+/**
+ * Returns non-zero if n is possible loop head of an endless loop.
+ * I.e., it is a Block, Phi or Filter node and has only predecessors
+ * within the loop.
+ *
+ * @param n the node to check
+ * @param root only needed for assertion.
+ */
+static int is_endless_head(ir_node *n, ir_node *root) {
+ int i, arity;
+ int none_outof_loop = 1, some_in_loop = 0;
+
+ /* Test for legal loop header: Block, Phi, ... */
+ if (!is_possible_loop_head(n))
+ return 0;
+
+ if (!is_outermost_Start(n)) {
+#ifndef NDEBUG
+ int uplink = get_irn_uplink(root);
+#endif
+ arity = get_irn_arity(n);
+ for (i = get_start_index(n); i < arity; i++) {
+ ir_node *pred;
+ if (is_backedge(n, i))
+ continue;
+ pred = get_irn_n(n, i);
+ if (!irn_is_in_stack(pred)) {
+ none_outof_loop = 0;
+ } else {
+ assert(get_irn_uplink(pred) >= uplink);
+ some_in_loop = 1;
+ }
+ }
+ }
+ return none_outof_loop & some_in_loop;
}
-/* Returns the number of nodes in the loop */
-int get_loop_n_nodes (ir_loop *loop) {
- assert(loop); assert(loop->kind == k_ir_loop);
- return ARR_LEN(loop->nodes);
+/** Returns index of the predecessor with the smallest dfn number
+ greater-equal than limit. */
+static int smallest_dfn_pred(ir_node *n, int limit) {
+ int i, index = -2, min = -1;
+
+ if (!is_outermost_Start(n)) {
+ int arity = get_irn_arity(n);
+ for (i = get_start_index(n); i < arity; i++) {
+ ir_node *pred = get_irn_n(n, i);
+ if (is_backedge(n, i) || !irn_is_in_stack(pred))
+ continue;
+ if (get_irn_dfn(pred) >= limit && (min == -1 || get_irn_dfn(pred) < min)) {
+ index = i;
+ min = get_irn_dfn(pred);
+ }
+ }
+ }
+ return index;
}
-ir_node *get_loop_node (ir_loop *loop, int pos) {
- assert(loop && loop->kind == k_ir_loop);
- return loop->nodes[pos];
+
+/**
+ * Returns index of the predecessor with the largest dfn number.
+ */
+static int largest_dfn_pred(ir_node *n) {
+ int i, index = -2, max = -1;
+
+ if (!is_outermost_Start(n)) {
+ int arity = get_irn_arity(n);
+ for (i = get_start_index(n); i < arity; i++) {
+ ir_node *pred = get_irn_n(n, i);
+ if (is_backedge (n, i) || !irn_is_in_stack(pred))
+ continue;
+ if (get_irn_dfn(pred) > max) {
+ index = i;
+ max = get_irn_dfn(pred);
+ }
+ }
+ }
+ return index;
}
-static INLINE void
-add_loop_node(ir_loop *loop, ir_node *n) {
- assert(loop && loop->kind == k_ir_loop);
- ARR_APP1 (ir_node *, loop->nodes, n);
+
+/**
+ * Searches the stack for possible loop heads. Tests these for backedges.
+ * If it finds a head with an unmarked backedge it marks this edge and
+ * returns the tail of the loop.
+ * If it finds no backedge returns NULL.
+ * ("disable_backedge" in fiasco)
+ *
+ * @param n A node where uplink == dfn.
+ */
+static ir_node *find_tail(ir_node *n) {
+ ir_node *m;
+ int i, res_index = -2;
+
+ /*
+ if (!icfg && rm_cyclic_phis && remove_cyclic_phis (n)) return NULL;
+ */
+ m = stack[tos-1]; /* tos = top of stack */
+ if (is_head(m, n)) {
+ res_index = smallest_dfn_pred(m, 0);
+ if ((res_index == -2) && /* no smallest dfn pred found. */
+ (n == m))
+ return NULL;
+ } else {
+ if (m == n) return NULL; // Is this to catch Phi - self loops?
+ for (i = tos-2; i >= 0; --i) {
+ m = stack[i];
+
+ if (is_head(m, n)) {
+ res_index = smallest_dfn_pred(m, get_irn_dfn(m) + 1);
+ if (res_index == -2) /* no smallest dfn pred found. */
+ res_index = largest_dfn_pred(m);
+
+ if ((m == n) && (res_index == -2)) { /* don't walk past loop head. */
+ i = -1;
+ }
+ break;
+ }
+
+ /* We should not walk past our selves on the stack: The upcoming nodes
+ are not in this loop. We assume a loop not reachable from Start. */
+ if (m == n) {
+ i = -1;
+ break;
+ }
+ }
+
+ if (i < 0) {
+ /* A dead loop not reachable from Start. */
+ for (i = tos-2; i >= 0; --i) {
+ m = stack[i];
+ if (is_endless_head(m, n)) {
+ res_index = smallest_dfn_pred(m, get_irn_dfn(m) + 1);
+ if (res_index == -2) /* no smallest dfn pred found. */
+ res_index = largest_dfn_pred (m);
+ break;
+ }
+ if (m == n) { break; } /* It's not an unreachable loop, either. */
+ }
+ //assert(0 && "no head found on stack");
+ }
+
+ }
+ if (res_index <= -2) {
+ /* It's a completely bad loop: without Phi/Block nodes that can
+ be a head. I.e., the code is "dying". We break the loop by
+ setting Bad nodes. */
+ int arity = get_irn_arity(n);
+ ir_node *bad = get_irg_bad(get_irn_irg(n));
+ for (i = -1; i < arity; ++i) {
+ set_irn_n(n, i, bad);
+ }
+ return NULL;
+ }
+ assert(res_index > -2);
+
+ set_backedge(m, res_index);
+ return is_outermost_Start(n) ? NULL : get_irn_n(m, res_index);
}
-/* The outermost loop is remarked in the surrounding graph. */
-void set_irg_loop(ir_graph *irg, ir_loop *loop) {
- assert(irg);
- irg->loop = loop;
+
+#if EXPERIMENTAL_LOOP_TREE
+
+/* ----------------------------------------------------------------
+ AS: This is experimental code to build loop trees suitable for
+ the heap analysis. Does not work correctly right now... :-(
+
+
+ Search in stack for the corresponding first Call-End-ProjX that
+ corresponds to one of the control flow predecessors of the given
+ block, that is the possible callers.
+ returns: the control predecessor to chose\
+ or -1 if no corresponding Call-End-Node could be found
+ on the stack.
+ - -------------------------------------------------------------- */
+
+int search_endproj_in_stack(ir_node *start_block) {
+ int i, j;
+ assert(is_Block(start_block));
+ for(i = tos - 1; i >= 0; --i)
+ {
+ if(get_irn_op(stack[i]) == op_Proj && get_irn_mode(stack[i]) == mode_X &&
+ get_irn_op(get_irn_n(stack[i], 0)) == op_EndReg)
+ {
+ printf("FOUND PROJ!!!!!!!!!!!!!!!!!!!!!!!!!!\n");
+ ir_node *end_projx = stack[i];
+
+ int arity = get_irn_arity(start_block);
+ for(j = 0; j < arity; j++)
+ {
+ ir_node *begin_projx = get_Block_cfgpred(get_irg_start_block(get_irn_irg(end_projx)),
+ get_Proj_proj(end_projx));
+ if(get_irn_n(start_block, j) == begin_projx)
+ {
+ printf("FOUND IT!!!!!!!!!!!!!!!!!!\n");
+ return(j);
+ }
+ }
+ }
+ }
+ return(-1);
}
-ir_loop *get_irg_loop(ir_graph *irg) {
- assert(irg);
- return irg->loop;
+
+
+static pmap *projx_link = NULL;
+
+void link_to_reg_end (ir_node *n, void *env) {
+ if(get_irn_op(n) == op_Proj &&
+ get_irn_mode(n) == mode_X &&
+ get_irn_op(get_irn_n(n, 0)) == op_EndReg) {
+ /* Reg End Projx -> Find the CallBegin Projx and hash it */
+ ir_node *end_projx = n;
+ ir_node *begin_projx = get_Block_cfgpred(get_irg_start_block(get_irn_irg(end_projx)),
+ get_Proj_proj(end_projx));
+ set_projx_link(begin_projx, end_projx);
+ }
}
-/**********************************************************************/
-/* Constructing and destructing the loop/backedge information. **/
-/**********************************************************************/
+void set_projx_link(ir_node *cb_projx, ir_node *end_projx) {
+ if(projx_link == NULL)
+ projx_link = pmap_create();
+ pmap_insert(projx_link, (void *)cb_projx, (void *)end_projx);
+}
-/* Initialization steps. **********************************************/
+ir_node *get_projx_link(ir_node *cb_projx) {
+ return((ir_node *) pmap_get(projx_link, (void *)cb_projx));
+}
-static INLINE void
-init_node (ir_node *n, void *env) {
- set_irn_link (n, new_scc_info());
- clear_backedges(n);
-#if 0
- /* Also init nodes not visible in intraproc_view. */
- /* @@@ init_node is called for too many nodes -- this wastes memory!.
- The mem is not lost as its on the obstack. */
- if (get_irn_op(n) == op_Filter) {
- for (i = 0; i < get_Filter_n_cg_preds(n); i++)
- init_node(get_Filter_cg_pred(n, i), NULL);
- }
- if (get_irn_op(n) == op_Block) {
- for (i = 0; i < get_Block_cg_n_cfgpreds(n); i++) {
- init_node(get_Block_cg_cfgpred(n, i), NULL);
- }
- }
- /* The following pattern matches only after a call from above pattern. */
- if ((get_irn_op(n) == op_Proj) /*&& (get_Proj_proj(n) == 0)*/) {
- /* @@@ init_node is called for every proj -- this wastes memory!.
- The mem is not lost as its on the obstack. */
- ir_node *cb = get_Proj_pred(n);
- if ((get_irn_op(cb) == op_CallBegin) ||
- (get_irn_op(cb) == op_EndReg) ||
- (get_irn_op(cb) == op_EndExcept)) {
- init_node(cb, NULL);
- init_node(get_nodes_Block(cb), NULL);
- }
#endif
+
+static INLINE int is_outermost_loop(ir_loop *l) {
+ return l == get_loop_outer_loop(l);
}
-static INLINE void
-init_scc (ir_graph *irg) {
- current_dfn = 1;
- loop_node_cnt = 0;
- init_stack();
- irg_walk_graph (irg, init_node, NULL, NULL);
- /*
- irg_walk (irg, link_to_reg_end, NULL, NULL);
- */
+
+/*-----------------------------------------------------------*
+ * The core algorithm. *
+ *-----------------------------------------------------------*/
+
+/**
+ * The core algorithm: Find strongly coupled components.
+ *
+ * @param n node to start
+ */
+static void scc(ir_node *n) {
+ if (irn_visited(n))
+ return;
+ mark_irn_visited(n);
+
+ /* Initialize the node */
+ set_irn_dfn(n, current_dfn); /* Depth first number for this node */
+ set_irn_uplink(n, current_dfn); /* ... is default uplink. */
+ set_irn_loop(n, NULL);
+ ++current_dfn;
+ push(n);
+
+ /* AS: get_start_index might return -1 for Control Flow Nodes, and thus a negative
+ array index would be passed to is_backedge(). But CFG Nodes dont't have a backedge array,
+ so is_backedge does not access array[-1] but correctly returns false! */
+
+ if (!is_outermost_Start(n)) {
+ int i, arity = get_irn_arity(n);
+
+ for (i = get_start_index(n); i < arity; ++i) {
+ ir_node *m;
+ if (is_backedge(n, i))
+ continue;
+ m = get_irn_n(n, i);
+ scc(m);
+ if (irn_is_in_stack(m)) {
+ /* Uplink of m is smaller if n->m is a backedge.
+ Propagate the uplink to mark the loop. */
+ if (get_irn_uplink(m) < get_irn_uplink(n))
+ set_irn_uplink(n, get_irn_uplink(m));
+ }
+ }
+ }
+
+ if (get_irn_dfn(n) == get_irn_uplink(n)) {
+ /* This condition holds for
+ 1) the node with the incoming backedge.
+ That is: We found a loop!
+ 2) Straight line code, because no uplink has been propagated, so the
+ uplink still is the same as the dfn.
+
+ But n might not be a proper loop head for the analysis. Proper loop
+ heads are Block and Phi nodes. find_tail() searches the stack for
+ Block's and Phi's and takes those nodes as loop heads for the current
+ loop instead and marks the incoming edge as backedge. */
+
+ ir_node *tail = find_tail(n);
+ if (tail != NULL) {
+ /* We have a loop, that is no straight line code,
+ because we found a loop head!
+ Next actions: Open a new loop on the loop tree and
+ try to find inner loops */
+
+#if NO_LOOPS_WITHOUT_HEAD
+ /* This is an adaption of the algorithm from fiasco / optscc to
+ * avoid loops without Block or Phi as first node. This should
+ * severely reduce the number of evaluations of nodes to detect
+ * a fixpoint in the heap analysis.
+ * Further it avoids loops without firm nodes that cause errors
+ * in the heap analyses.
+ * But attention: don't do it for the outermost loop: This loop
+ * is not iterated. A first block can be a loop head in case of
+ * an endless recursion. */
+
+ ir_loop *l;
+ int close;
+ if ((get_loop_n_elements(current_loop) > 0) || (is_outermost_loop(current_loop))) {
+ l = new_loop();
+ close = 1;
+ } else {
+ l = current_loop;
+ close = 0;
+ }
+#else
+ ir_loop *l = new_loop();
+#endif
+
+ /* Remove the loop from the stack ... */
+ pop_scc_unmark_visit(n);
+
+ /* The current backedge has been marked, that is temporarily eliminated,
+ by find tail. Start the scc algorithm
+ again on the subgraph that is left (the current loop without the backedge)
+ in order to find more inner loops. */
+ scc(tail);
+
+ assert(irn_visited(n));
+#if NO_LOOPS_WITHOUT_HEAD
+ if (close)
+#endif
+ close_loop(l);
+ } else {
+ /* No loop head was found, that is we have straight line code.
+ Pop all nodes from the stack to the current loop. */
+ pop_scc_to_loop(n);
+ }
+ }
}
-static INLINE void
-init_ip_scc (void) {
- current_dfn = 1;
- loop_node_cnt = 0;
- init_stack();
- cg_walk (init_node, NULL, NULL);
+#ifdef INTERPROCEDURAL_VIEW
+static void my_scc(ir_node *n) {
+ int i;
+ if (irn_visited(n))
+ return;
+ mark_irn_visited(n);
+
+ /* Initialize the node */
+ set_irn_dfn(n, current_dfn); /* Depth first number for this node */
+ set_irn_uplink(n, current_dfn); /* ... is default uplink. */
+ set_irn_loop(n, NULL);
+ current_dfn ++;
+ push(n);
+
+ /* AS: get_start_index might return -1 for Control Flow Nodes, and thus a negative
+ array index would be passed to is_backedge(). But CFG Nodes dont't have a backedge array,
+ so is_backedge does not access array[-1] but correctly returns false! */
+
+ if (!is_outermost_Start(n)) {
+ int arity = get_irn_arity(n);
+
+ for (i = get_start_index(n); i < arity; i++) {
+ ir_node *m;
+ if (is_backedge(n, i)) continue;
+ m = get_irn_n(n, i); /* get_irn_ip_pred(n, i); */
+ /* if ((!m) || (get_irn_op(m) == op_Unknown)) continue; */
+ my_scc(m);
+ if (irn_is_in_stack(m)) {
+ /* Uplink of m is smaller if n->m is a backedge.
+ Propagate the uplink to mark the loop. */
+ if (get_irn_uplink(m) < get_irn_uplink(n))
+ set_irn_uplink(n, get_irn_uplink(m));
+ }
+ }
+ }
+
+ if (get_irn_dfn(n) == get_irn_uplink(n)) {
+ /* This condition holds for
+ 1) the node with the incoming backedge.
+ That is: We found a loop!
+ 2) Straight line code, because no uplink has been propagated, so the
+ uplink still is the same as the dfn.
+
+ But n might not be a proper loop head for the analysis. Proper loop
+ heads are Block and Phi nodes. find_tail searches the stack for
+ Block's and Phi's and takes those nodes as loop heads for the current
+ loop instead and marks the incoming edge as backedge. */
+
+ ir_node *tail = find_tail(n);
+ if (tail) {
+ /* We have a loop, that is no straight line code,
+ because we found a loop head!
+ Next actions: Open a new loop on the loop tree and
+ try to find inner loops */
+
+#if NO_LOOPS_WITHOUT_HEAD
+ /* This is an adaption of the algorithm from fiasco / optscc to
+ * avoid loops without Block or Phi as first node. This should
+ * severely reduce the number of evaluations of nodes to detect
+ * a fixpoint in the heap analysis.
+ * Further it avoids loops without firm nodes that cause errors
+ * in the heap analyses. */
+
+ ir_loop *l;
+ int close;
+ if ((get_loop_n_elements(current_loop) > 0) || (is_outermost_loop(current_loop))) {
+ l = new_loop();
+ close = 1;
+ } else {
+ l = current_loop;
+ close = 0;
+ }
+#else
+ ir_loop *l = new_loop();
+#endif
+
+ /* Remove the loop from the stack ... */
+ pop_scc_unmark_visit(n);
+
+ /* The current backedge has been marked, that is temporarily eliminated,
+ by find tail. Start the scc algorithm
+ anew on the subgraph that is left (the current loop without the backedge)
+ in order to find more inner loops. */
+ my_scc(tail);
+
+ assert(irn_visited(n));
+#if NO_LOOPS_WITHOUT_HEAD
+ if (close)
+#endif
+ close_loop(l);
+ } else {
+ /* No loop head was found, that is we have straightline code.
+ Pop all nodes from the stack to the current loop. */
+ pop_scc_to_loop(n);
+ }
+ }
}
+#endif /* INTERPROCEDURAL_VIEW */
-#if 0
-Works, but is inefficient.
-static INLINE void
-init_ip_scc (void) {
- int i;
- interprocedural_view = 1;
- current_dfn = 1;
- loop_node_cnt = 0;
- init_stack();
- for (i = 0; i < get_irp_n_irgs(); i++) {
- current_ir_graph = get_irp_irg(i);
- irg_walk_graph (current_ir_graph, init_node, NULL, NULL);
- /* @@@ decrease max_visited to avoide double walks */
- }
+/* Constructs backedge information for irg. In interprocedural view constructs
+ backedges for all methods called by irg, too. */
+int construct_backedges(ir_graph *irg) {
+ ir_graph *rem = current_ir_graph;
+ ir_loop *head_rem;
+ struct obstack temp;
+
+ assert(!get_interprocedural_view() &&
+ "not implemented, use construct_ip_backedges()");
+
+ max_loop_depth = 0;
+ current_ir_graph = irg;
+ outermost_ir_graph = irg;
+
+ obstack_init(&temp);
+ init_scc(irg, &temp);
+
+ current_loop = NULL;
+ new_loop(); /* sets current_loop */
+ head_rem = current_loop; /* Just for assertion */
+
+ inc_irg_visited(irg);
+
+ scc(get_irg_end(irg));
+ obstack_free(&temp, NULL);
+
+ assert(head_rem == current_loop);
+ mature_loops(current_loop, irg->obst);
+ set_irg_loop(irg, current_loop);
+ set_irg_loopinfo_state(irg, loopinfo_consistent);
+ assert(get_irg_loop(irg)->kind == k_ir_loop);
+ current_ir_graph = rem;
+ return max_loop_depth;
+}
+
+
+#ifdef INTERPROCEDURAL_VIEW
+int construct_ip_backedges(void) {
+ ir_graph *rem = current_ir_graph;
+ int rem_ipv = get_interprocedural_view();
+ int i;
+ strcut obstack temp;
+
+ max_loop_depth = 0;
+ assert(get_irp_ip_view_state() == ip_view_valid);
+
+ outermost_ir_graph = get_irp_main_irg();
+
+ obstack_init(&temp);
+ init_ip_scc(&temp);
+
+ current_loop = NULL;
+ new_loop(); /* sets current_loop */
+ set_interprocedural_view(1);
+
+ inc_max_irg_visited();
+ for (i = 0; i < get_irp_n_irgs(); i++)
+ set_irg_visited(get_irp_irg(i), get_max_irg_visited());
+
+ /** We have to start the walk at the same nodes as cg_walk. **/
+ /* Walk starting at unreachable procedures. Only these
+ * have End blocks visible in interprocedural view. */
+ for (i = 0; i < get_irp_n_irgs(); i++) {
+ ir_node *sb;
+ current_ir_graph = get_irp_irg(i);
+
+ sb = get_irg_start_block(current_ir_graph);
+
+ if ((get_Block_n_cfgpreds(sb) > 1) ||
+ (get_nodes_block(get_Block_cfgpred(sb, 0)) != sb))
+ continue;
+
+ scc(get_irg_end(current_ir_graph));
+ }
+
+ /* Check whether we walked all procedures: there could be procedures
+ with cyclic calls but no call from the outside. */
+ for (i = 0; i < get_irp_n_irgs(); i++) {
+ ir_node *sb;
+ current_ir_graph = get_irp_irg(i);
+
+ /* Test start block: if inner procedure end and end block are not
+ * visible and therefore not marked. */
+ sb = get_irg_start_block(current_ir_graph);
+ if (get_irn_visited(sb) < get_irg_visited(current_ir_graph)) scc(sb);
+ }
+
+ /* Walk all endless loops in inner procedures.
+ * We recognize an inner procedure if the End node is not visited. */
+ for (i = 0; i < get_irp_n_irgs(); i++) {
+ ir_node *e;
+ current_ir_graph = get_irp_irg(i);
+
+ e = get_irg_end(current_ir_graph);
+ if (get_irn_visited(e) < get_irg_visited(current_ir_graph)) {
+ int j;
+ /* Don't visit the End node. */
+ for (j = 0; j < get_End_n_keepalives(e); j++)
+ scc(get_End_keepalive(e, j));
+ }
+ }
+
+ set_irg_loop(outermost_ir_graph, current_loop);
+ set_irg_loopinfo_state(current_ir_graph, loopinfo_ip_consistent);
+ assert(get_irg_loop(outermost_ir_graph)->kind == k_ir_loop);
+
+ obstack_free(&temp, NULL);
+ current_ir_graph = rem;
+ set_interprocedural_view(rem_ipv);
+ return max_loop_depth;
+}
+
+void my_construct_ip_backedges(void) {
+ ir_graph *rem = current_ir_graph;
+ int rem_ipv = get_interprocedural_view();
+ int i;
+
+ assert(get_irp_ip_view_state() == ip_view_valid);
+
+ outermost_ir_graph = get_irp_main_irg();
+
+ init_ip_scc();
+
+ current_loop = NULL;
+ new_loop(); /* sets current_loop */
+ set_interprocedural_view(1);
+
+ inc_max_irg_visited();
+ for (i = 0; i < get_irp_n_irgs(); i++)
+ set_irg_visited(get_irp_irg(i), get_max_irg_visited());
+
+ /** We have to start the walk at the same nodes as cg_walk. **/
+ /* Walk starting at unreachable procedures. Only these
+ * have End blocks visible in interprocedural view. */
+ for (i = 0; i < get_irp_n_irgs(); i++) {
+ ir_node *sb;
+ current_ir_graph = get_irp_irg(i);
+
+ sb = get_irg_start_block(current_ir_graph);
+
+ if ((get_Block_n_cfgpreds(sb) > 1) ||
+ (get_nodes_block(get_Block_cfgpred(sb, 0)) != sb)) continue;
+
+ my_scc(get_irg_end(current_ir_graph));
+ }
+
+ /* Check whether we walked all procedures: there could be procedures
+ with cyclic calls but no call from the outside. */
+ for (i = 0; i < get_irp_n_irgs(); i++) {
+ ir_node *sb;
+ current_ir_graph = get_irp_irg(i);
+
+ /* Test start block: if inner procedure end and end block are not
+ * visible and therefore not marked. */
+ sb = get_irg_start_block(current_ir_graph);
+ if (get_irn_visited(sb) < get_irg_visited(current_ir_graph))
+ scc(sb);
+ }
+
+ /* Walk all endless loops in inner procedures.
+ * We recognize an inner procedure if the End node is not visited. */
+ for (i = 0; i < get_irp_n_irgs(); i++) {
+ ir_node *e;
+ current_ir_graph = get_irp_irg(i);
+
+ e = get_irg_end(current_ir_graph);
+ if (get_irn_visited(e) < get_irg_visited(current_ir_graph)) {
+ int j;
+ /* Don't visit the End node. */
+ for (j = 0; j < get_End_n_keepalives(e); j++) scc(get_End_keepalive(e, j));
+ }
+ }
+
+ set_irg_loop(outermost_ir_graph, current_loop);
+ set_irg_loopinfo_state(current_ir_graph, loopinfo_ip_consistent);
+ assert(get_irg_loop(outermost_ir_graph)->kind == k_ir_loop);
+
+ current_ir_graph = rem;
+ set_interprocedural_view(rem_ipv);
}
#endif
-/* Condition for breaking the recursion. */
-static bool is_outermost_Start(ir_node *n) {
- /* Test whether this is the outermost Start node. If so
- recursion must end. */
- if ((get_irn_op(n) == op_Block) &&
- (get_Block_n_cfgpreds(n) == 1) &&
- (get_irn_op(skip_Proj(get_Block_cfgpred(n, 0))) == op_Start) &&
- (get_nodes_Block(skip_Proj(get_Block_cfgpred(n, 0))) == n)) {
- return true;
- }
-#if 0
- /* @@@ Bad condition:
- not possible in interprocedural view as outermost_graph is
- not necessarily the only with a dead-end start block.
- Besides current_ir_graph is not set properly. */
- if ((get_irn_op(n) == op_Block) &&
- (n == get_irg_start_block(current_ir_graph))) {
- if ((!interprocedural_view) ||
- (current_ir_graph == outermost_ir_graph))
- return true;
- }
+static void reset_backedges(ir_node *n) {
+ if (is_possible_loop_head(n)) {
+#ifdef INTERPROCEDURAL_VIEW
+ int rem = get_interprocedural_view();
+
+ set_interprocedural_view(1);
+ clear_backedges(n);
+ set_interprocedural_view(1);
+ clear_backedges(n);
+ set_interprocedural_view(rem);
+#else
+ clear_backedges(n);
#endif
- return false;
-}
-
-/* Don't walk from nodes to blocks except for Control flow operations. */
-static INLINE int
-get_start_index(ir_node *n) {
- if (is_cfop(n) || is_fragile_op(n) || get_irn_op(n) == op_Start)
- return -1;
- else
- return 0;
-}
-
-/* Returns current_ir_graph and set it to the irg of predecessor index
- of node n. */
-static INLINE ir_graph *
-switch_irg (ir_node *n, int index) {
- ir_graph *old_current = current_ir_graph;
-
- if (interprocedural_view) {
- /* Only Filter and Block nodes can have predecessors in other graphs. */
- if (get_irn_op(n) == op_Filter)
- n = get_nodes_Block(n);
- if (get_irn_op(n) == op_Block) {
- ir_node *cfop = skip_Proj(get_Block_cfgpred(n, index));
- if (is_ip_cfop(cfop)) {
- current_ir_graph = get_irn_irg(cfop);
- set_irg_visited(current_ir_graph, get_max_irg_visited());
- }
- }
- }
-
- return old_current;
-}
-
-/* Walks up the stack passing n and then finding the node
- where we walked into the irg n is contained in.
- Here we switch the irg. */
-static ir_graph *
-find_irg_on_stack (ir_node *n) {
- ir_node *m;
- ir_graph *old_current = current_ir_graph;
- int i;
-
- if (interprocedural_view) {
- for (i = tos; i >= 0; i--) {
- if (stack[i] == n) break;
- }
- if (i < 0) i = tos;
-
- //printf(" Here\n");
-
- assert (i >= 0);
- for (; i >= 0; i--) {
- m = stack[i];
- //printf(" Visiting %d ", i); DDMN(m);
- if (is_ip_cfop(m)) {
- current_ir_graph = get_irn_irg(m);
- break;
- }
- if (get_irn_op(m) == op_Filter) {
- /* Find the corresponding ip_cfop */
- ir_node *pred = stack[i+1];
- int j;
- for (j = 0; j < get_Filter_n_cg_preds(m); j++)
- if (get_Filter_cg_pred(m, j) == pred) break;
- if (j >= get_Filter_n_cg_preds(m))
- /* It is a filter we didn't pass as the predecessors are marked. */
- continue;
- assert(get_Filter_cg_pred(m, j) == pred);
- switch_irg(m, j);
- break;
- }
- }
- }
-
- return old_current;
+ }
}
-#if 0
-static void test(ir_node *pred, ir_node *root, ir_node *this) {
- int i;
- if (get_irn_uplink(pred) >= get_irn_uplink(root)) return;
- printf("this: %d ", get_irn_uplink(this)); DDMN(this);
- printf("pred: %d ", get_irn_uplink(pred)); DDMN(pred);
- printf("root: %d ", get_irn_uplink(root)); DDMN(root);
+/*
+static void loop_reset_backedges(ir_loop *l) {
+ int i;
+ reset_backedges(get_loop_node(l, 0));
+ for (i = 0; i < get_loop_n_nodes(l); ++i)
+ set_irn_loop(get_loop_node(l, i), NULL);
+ for (i = 0; i < get_loop_n_sons(l); ++i) {
+ loop_reset_backedges(get_loop_son(l, i));
+ }
+}
+*/
+
+static void loop_reset_node(ir_node *n, void *env) {
+ (void) env;
+ set_irn_loop(n, NULL);
+ reset_backedges(n);
+}
- printf("tos: %d\n", tos);
- for (i = tos; i >= 0; i--) {
- ir_node *n = stack[i];
- if (!n) continue;
- printf(" uplink: %d, pos: %d ", get_irn_uplink(n), i); DDMN(n);
- }
+/** Removes all loop information.
+ Resets all backedges */
+void free_loop_information(ir_graph *irg) {
+ /* We can not use this recursion, as the loop might contain
+ illegal nodes by now. Why else would we throw away the
+ representation?
+ if (get_irg_loop(irg)) loop_reset_backedges(get_irg_loop(irg));
+ */
+ irg_walk_graph(irg, loop_reset_node, NULL, NULL);
+ set_irg_loop(irg, NULL);
+ set_irg_loopinfo_state(current_ir_graph, loopinfo_none);
+ /* We cannot free the loop nodes, they are on the obstack. */
}
+
+
+void free_all_loop_information(void) {
+ int i;
+#ifdef INTERPROCEDURAL_VIEW
+ int rem = get_interprocedural_view();
+ set_interprocedural_view(1); /* To visit all filter nodes */
#endif
+ for (i = 0; i < get_irp_n_irgs(); i++) {
+ free_loop_information(get_irp_irg(i));
+ }
+#ifdef INTERPROCEDURAL_VIEW
+ set_interprocedural_view(rem);
+#endif
+}
+
+
+
+
+
+/* Debug stuff *************************************************/
+
+static int test_loop_node(ir_loop *l) {
+ int i, has_node = 0, found_problem = 0;
+ loop_element le;
+
+ assert(l && l->kind == k_ir_loop);
+
+ if (get_loop_n_elements(l) == 0) {
+ found_problem = 1;
+ dump_loop(l, "-ha");
+ }
+
+ le = get_loop_element(l, 0);
+ if (*(le.kind) != k_ir_node) {
+ assert(le.kind && *(le.kind) == k_ir_loop);
+
+ found_problem = 1;
+ dump_loop(l, "-ha");
+ }
+
+ if ((*(le.kind) == k_ir_node) && !is_possible_loop_head(le.node)) {
+ found_problem = 1;
+ dump_loop(l, "-ha");
+ }
-/* Returns true if n is a loop header, i.e., it is a Block, Phi
- or Filter node and has predecessors within the loop and out
- of the loop. */
-static bool
-is_head (ir_node *n, ir_node *root)
-{
- int i;
- int some_outof_loop = 0, some_in_loop = 0;
-
- /* Test for legal loop header */
- if (!((get_irn_op(n) == op_Block) ||
- (get_irn_op(n) == op_Phi) ||
- ((get_irn_op(n) == op_Filter) && interprocedural_view)))
- return false;
-
- if (!is_outermost_Start(n)) {
- for (i = get_start_index(n); i < get_irn_arity(n); i++) {
- ir_node *pred = get_irn_n(n, i);
- assert(pred);
- if (is_backedge(n, i)) continue;
- if (!irn_is_in_stack(pred)) {
- some_outof_loop = 1;
- } else {
- assert(get_irn_uplink(pred) >= get_irn_uplink(root));
- some_in_loop = 1;
- }
- }
- }
- return some_outof_loop && some_in_loop;
-}
-
-/* Returns index of the predecessor with the smallest dfn number
- greater-equal than limit. */
-static int
-smallest_dfn_pred (ir_node *n, int limit)
-{
- int i, index = -2, min = -1;
-
- if (!is_outermost_Start(n)) {
- for (i = get_start_index(n); i < get_irn_arity(n); i++) {
- ir_node *pred = get_irn_n(n, i);
- assert(pred);
- if (is_backedge(n, i) || !irn_is_in_stack(pred)) continue;
- if (get_irn_dfn(pred) >= limit
- && (min == -1 || get_irn_dfn(pred) < min)) {
- index = i;
- min = get_irn_dfn(pred);
- }
- }
- }
- return index;
-}
-
-/* Returns index of the predecessor with the largest dfn number. */
-static int
-largest_dfn_pred (ir_node *n)
-{
- int i, index = -2, max = -1;
-
- if (!is_outermost_Start(n)) {
- for (i = get_start_index(n); i < get_irn_arity(n); i++) {
- ir_node *pred = get_irn_n(n, i);
- if (is_backedge (n, i) || !irn_is_in_stack(pred)) continue;
- if (get_irn_dfn(pred) > max) {
- index = i;
- max = get_irn_dfn(pred);
- }
- }
- }
- return index;
-}
-
-/* Searches the stack for possible loop heads. Tests these for backedges.
- If it finds a head with an unmarked backedge it marks this edge and
- returns the tail of the loop.
- If it finds no backedge returns NULL. */
-static ir_node *
-find_tail (ir_node *n) {
- ir_node *m;
- int i, res_index = -2;
-
- /*
- if (!icfg && rm_cyclic_phis && remove_cyclic_phis (n)) return NULL;
- */
-
- m = stack[tos-1];
- if (is_head (m, n)) {
- res_index = smallest_dfn_pred(m, 0);
- if ((res_index == -2) && /* no smallest dfn pred found. */
- (n == m))
- return NULL;
- } else {
- if (m == n) return NULL;
- for (i = tos-2; ; --i) {
- m = stack[i];
- if (is_head (m, n)) {
- res_index = smallest_dfn_pred (m, get_irn_dfn(m) + 1);
- if (res_index == -2) /* no smallest dfn pred found. */
- res_index = largest_dfn_pred (m);
- break;
- }
- }
- }
- assert (res_index > -2);
-
- set_backedge (m, res_index);
- return is_outermost_Start(n) ? NULL : get_irn_n(m, res_index);
-}
-
-
-/* The core algorithm. *****************************************/
-
-static void scc (ir_node *n) {
- int i;
- ir_graph *rem;
-
- if (irn_visited(n)) return;
- mark_irn_visited(n);
- //printf("mark: %d ", get_irn_visited(n)); DDMN(n);
- //DDME(get_irg_ent(current_ir_graph));
-
- /* Initialize the node */
- set_irn_dfn(n, current_dfn); /* Depth first number for this node */
- set_irn_uplink(n, current_dfn); /* ... is default uplink. */
- set_irn_loop_tmp(n, NULL);
- current_dfn ++;
-
- /* What's this good for?
- n->ana.scc.section = NULL;
- */
-
- push(n);
-
- if (!is_outermost_Start(n)) {
- for (i = get_start_index(n); i < get_irn_arity(n); i++) {
- ir_node *m;
- if (is_backedge(n, i)) continue;
-
- m = get_irn_n(n, i); //get_irn_ip_pred(n, i);
- if ((!m) || (get_irn_op(m) == op_Unknown)) continue;
- scc (m);
- //return_recur(n, i);
-
- if (irn_is_in_stack(m)) {
- /* Uplink of m is smaller if n->m is a backedge.
- Propagate the uplink to mark the loop. */
- if (get_irn_uplink(m) < get_irn_uplink(n))
- set_irn_uplink(n, get_irn_uplink(m));
- }
- }
- }
- if (get_irn_dfn(n) == get_irn_uplink(n)) {
- /* This condition holds for the node with the incoming backedge. */
- ir_node *tail = find_tail(n);
- if (tail) {
- /* We found a new loop! */
- ir_loop *l = new_loop();
- /* Remove the loop from the stack ... */
- pop_scc_unmark_visit (n);
- /* and recompute it in a better order; and so that it goes into
- the new loop. */
- rem = find_irg_on_stack(tail);
- scc (tail);
- current_ir_graph = rem;
-
- assert (irn_visited(n));
-
- current_loop = l;
- } else {
- pop_scc_to_loop(n);
- }
- }
+ if ((get_loop_depth(l) != 0) &&
+ (*(le.kind) == k_ir_node) && !has_backedges(le.node)) {
+ found_problem = 1;
+ dump_loop(l, "-ha");
+ }
+
+ /* Recur */
+ has_node = 0;
+ for (i = 0; i < get_loop_n_elements(l); ++i) {
+ le = get_loop_element(l, i);
+ if (*(le.kind) == k_ir_node)
+ has_node++;
+ else
+ if (test_loop_node(le.son)) found_problem = 1;
+ }
+
+ if (has_node == 0) {
+ found_problem = 1;
+ dump_loop(l, "-ha");
+ }
+
+ return found_problem;
}
-/* Constructs backedge information for irg. In interprocedural view constructs
- backedges for all methods called by irg, too. */
-void construct_backedges(ir_graph *irg) {
- ir_graph *rem = current_ir_graph;
- ir_loop *head_rem;
- int i;
-
- assert(!interprocedural_view &&
- "not implemented, use construct_ip_backedges");
-
- current_ir_graph = irg;
- outermost_ir_graph = irg;
-
- init_scc(irg);
-
- current_loop = NULL;
- new_loop(); /* sets current_loop */
- head_rem = current_loop; /* Just for assertion */
-
- if (interprocedural_view) {
- set_irg_visited(irg, inc_max_irg_visited());
- init_ip_walk ();
- } else {
- inc_irg_visited(irg);
- }
-
- scc(get_irg_end(irg));
- for (i = 0; i < get_End_n_keepalives(get_irg_end(irg)); i++)
- scc(get_End_keepalive(get_irg_end(irg), i));
-
- if (interprocedural_view) finish_ip_walk();
-
- assert(head_rem == current_loop);
- set_irg_loop(irg, current_loop);
- assert(get_irg_loop(irg)->kind == k_ir_loop);
- /*
- irg->loops = current_loop;
- if (icfg == 1) {
- int count = 0;
- int depth = 0;
- count_loop (the_loop, &count, &depth);
- }
- }
- */
- current_ir_graph = rem;
-}
-
-
-
-void construct_ip_backedges (void) {
- ir_graph *rem = current_ir_graph;
- int rem_ipv = interprocedural_view;
- int i, j;
-
- outermost_ir_graph = get_irp_main_irg();
-
- init_ip_scc();
-
- current_loop = NULL;
- new_loop(); /* sets current_loop */
- interprocedural_view = 1;
-
- inc_max_irg_visited();
- for (i = 0; i < get_irp_n_irgs(); i++)
- set_irg_visited(get_irp_irg(i), get_max_irg_visited());
-
- for (i = 0; i < get_irp_n_irgs(); i++) {
- ir_node *sb;
- current_ir_graph = get_irp_irg(i);
- //DDME(get_irg_ent(current_ir_graph));
- /* Find real entry points */
- sb = get_irg_start_block(current_ir_graph);
- if ((get_Block_n_cfgpreds(sb) > 1) ||
- (get_nodes_Block(get_Block_cfgpred(sb, 0)) != sb)) continue;
- // printf("running scc for "); DDME(get_irg_ent(current_ir_graph));
- /* Compute scc for this graph */
- outermost_ir_graph = current_ir_graph;
- set_irg_visited(outermost_ir_graph, get_max_irg_visited());
- scc(get_irg_end(current_ir_graph));
- for (j = 0; j < get_End_n_keepalives(get_irg_end(outermost_ir_graph)); j++)
- scc(get_End_keepalive(get_irg_end(outermost_ir_graph), j));
- }
-
- set_irg_loop(outermost_ir_graph, current_loop);
- assert(get_irg_loop(outermost_ir_graph)->kind == k_ir_loop);
-
- current_ir_graph = rem;
- interprocedural_view = rem_ipv;
+/** Prints all loop nodes that
+ * - do not have any firm nodes, only loop sons
+ * - the header is not a Phi, Block or Filter.
+ */
+void find_strange_loop_nodes(ir_loop *l) {
+ int found_problem = 0;
+ found_problem = test_loop_node(l);
+ printf("Finished Test\n\n");
+ if (found_problem) exit(0);
+
+}
+
+/* ------------------------------------------------------------------- */
+/* Simple analyses based on the loop information */
+/* ------------------------------------------------------------------- */
+
+int is_loop_variant(ir_loop *l, ir_loop *b) {
+ int i, n_elems;
+
+ if (l == b) return 1;
+
+ n_elems = get_loop_n_elements(l);
+ for (i = 0; i < n_elems; ++i) {
+ loop_element e = get_loop_element(l, i);
+ if (is_ir_loop(e.kind))
+ if (is_loop_variant(e.son, b))
+ return 1;
+ }
+
+ return 0;
+}
+
+/* Test whether a value is loop invariant.
+ *
+ * @param n The node to be tested.
+ * @param block A block node. We pass the block, not the loop as we must
+ * start off with a block loop to find all proper uses.
+ *
+ * Returns non-zero, if the node n is not changed in the loop block
+ * belongs to or in inner loops of this blocks loop. */
+int is_loop_invariant(ir_node *n, ir_node *block) {
+ ir_loop *l = get_irn_loop(block);
+ ir_node *b = is_Block(n) ? n : get_nodes_block(n);
+ return !is_loop_variant(l, get_irn_loop(b));
}