/*
- * 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.
+ * Copyright (C) 2012 University of Karlsruhe.
*/
/**
* Chapter 5.2.1.2.
* @author Goetz Lindenmaier
* @date 7.2002
- * @version $Id$
*/
#include "config.h"
-#ifdef HAVE_STRING_H
-# include <string.h>
-#endif
-#ifdef HAVE_STDLIB_H
-# include <stdlib.h>
-#endif
+#include <string.h>
+#include <stdlib.h>
#include "irloop_t.h"
#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
+#include "ircons.h"
/** The outermost graph the scc is computed for. */
static ir_graph *outermost_ir_graph;
/** 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. **/
/**********************************************************************/
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;
/**
* 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 scc_info *new_scc_info(struct obstack *obst)
+{
+ return OALLOCZ(obst, scc_info);
}
/**
* 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);
+static inline void mark_irn_in_stack(ir_node *n)
+{
+ scc_info *scc = (scc_info*) get_irn_link(n);
assert(scc);
scc->in_stack = 1;
}
/**
* 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);
+static inline void mark_irn_not_in_stack(ir_node *n)
+{
+ scc_info *scc = (scc_info*) get_irn_link(n);
assert(scc);
scc->in_stack = 0;
}
/**
* 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);
+static inline int irn_is_in_stack(ir_node *n)
+{
+ scc_info *scc = (scc_info*) get_irn_link(n);
assert(scc);
return scc->in_stack;
}
/**
* 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);
+static inline void set_irn_uplink(ir_node *n, int uplink)
+{
+ scc_info *scc = (scc_info*) get_irn_link(n);
assert(scc);
scc->uplink = uplink;
}
/**
* Returns the uplink number for a node.
*/
-static int get_irn_uplink(ir_node *n) {
- scc_info *scc = get_irn_link(n);
+static int get_irn_uplink(ir_node *n)
+{
+ scc_info *scc = (scc_info*) get_irn_link(n);
assert(scc);
return scc->uplink;
}
/**
* 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);
+static inline void set_irn_dfn(ir_node *n, int dfn)
+{
+ scc_info *scc = (scc_info*) get_irn_link(n);
assert(scc);
scc->dfn = dfn;
}
/**
* Returns the depth-first-search number of a node.
*/
-static int get_irn_dfn(ir_node *n) {
- scc_info *scc = get_irn_link(n);
+static int get_irn_dfn(ir_node *n)
+{
+ scc_info *scc = (scc_info*) get_irn_link(n);
assert(scc);
return scc->dfn;
}
-#if 0
-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;
-}
-#endif
-
/**********************************************************************/
/* A stack. **/
/**********************************************************************/
static ir_node **stack = NULL;
-static int tos = 0; /* top of stack */
+static size_t tos = 0; /* top of stack */
/**
* initializes the stack
*/
-static inline void init_stack(void) {
+static inline void init_stack(void)
+{
if (stack) {
ARR_RESIZE(ir_node *, stack, 1000);
} else {
/**
* Frees the stack.
*/
-static void finish_stack(void) {
+static void finish_stack(void)
+{
DEL_ARR_F(stack);
stack = NULL;
}
*
* @param n The node to push
*/
-static inline void push(ir_node *n) {
+static inline void push(ir_node *n)
+{
if (tos == ARR_LEN(stack)) {
- int nlen = ARR_LEN(stack) * 2;
+ size_t nlen = ARR_LEN(stack) * 2;
ARR_RESIZE(ir_node *, stack, nlen);
}
- stack [tos++] = n;
+ stack[tos++] = n;
mark_irn_in_stack(n);
}
*
* @return The topmost node
*/
-static inline ir_node *pop(void) {
- ir_node *n = stack[--tos];
+static inline ir_node *pop(void)
+{
+ ir_node *n;
+
+ assert(tos > 0);
+ 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) {
+static inline void pop_scc_to_loop(ir_node *n)
+{
ir_node *m;
- int i = 0;
do {
m = pop();
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");
- */
}
/* 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;
+static void close_loop(ir_loop *l)
+{
+ size_t last = get_loop_n_elements(l) - 1;
loop_element lelement = get_loop_element(l, last);
ir_loop *last_son = lelement.son;
/* 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) {
+static inline void pop_scc_unmark_visit(ir_node *n)
+{
ir_node *m = NULL;
while (m != n) {
/* 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) {
+static ir_loop *new_loop(void)
+{
ir_loop *father = current_loop;
- ir_loop *son = alloc_loop(father, outermost_ir_graph->obst);
+ ir_loop *son = alloc_loop(father, get_irg_obstack(outermost_ir_graph));
- if (son->depth > max_loop_depth) max_loop_depth = son->depth;
current_loop = son;
return father;
}
/* Initialization steps. **********************************************/
-static inline void init_node(ir_node *n, void *env) {
- struct obstack *obst = env;
+static inline void init_node(ir_node *n, void *env)
+{
+ struct obstack *obst = (struct obstack*) env;
set_irn_link(n, new_scc_info(obst));
clear_backedges(n);
}
-static inline void init_scc_common(void) {
+static inline void init_scc_common(void)
+{
current_dfn = 1;
loop_node_cnt = 0;
init_stack();
}
-static inline void init_scc(ir_graph *irg, struct obstack *obst) {
+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);
- */
}
static inline void finish_scc(void)
finish_stack();
}
-#ifdef INTERPROCEDURAL_VIEW
-static inline void init_ip_scc(struct obstack *obst) {
- init_scc_common();
- cg_walk(init_node, NULL, obst);
-
-#if EXPERIMENTAL_LOOP_TREE
- cg_walk(link_to_reg_end, NULL, NULL);
-#endif
-}
-#endif
-
/**
- * Check weather a given node represents the outer most Start
+ * Check whether a given node represents the outermost 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.
*
* This is the condition for breaking the scc recursion.
*/
-static int is_outermost_Start(ir_node *n) {
+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));
}
/* 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
-
+static inline int get_start_index(ir_node *n)
+{
/* 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 ||
- is_Block(n) ||
- (is_Filter(n) && get_interprocedural_view()) || (
- get_irg_pinned(get_irn_irg(n)) == op_pin_state_floats &&
- get_irn_pinned(n) == op_pin_state_floats
- ))
+ 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 (is_Phi(n) ||
+ is_Block(n) ||
+ (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) || is_Start(n))
- return -1;
- else
- return 0;
-
-#endif
}
/**
* Return non-zero if the given node is a legal loop header:
- * Block, Phi, Filter.
+ * Block, Phi
*
* @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()));
+static inline int is_possible_loop_head(ir_node *n)
+{
+ return is_Block(n) || is_Phi(n);
}
/**
- * 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.
+ * Returns non-zero if n is a loop header, i.e., it is a Block or Phi
+ * 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) {
+static int is_head(ir_node *n, ir_node *root)
+{
int i, arity;
int some_outof_loop = 0, some_in_loop = 0;
/**
* 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
+ * I.e., it is a Block or Phi 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) {
+static int is_endless_head(ir_node *n, ir_node *root)
+{
int i, arity;
int none_outof_loop = 1, some_in_loop = 0;
/** Returns index of the predecessor with the smallest dfn number
greater-equal than limit. */
-static int smallest_dfn_pred(ir_node *n, int limit) {
+static int smallest_dfn_pred(ir_node *n, int limit)
+{
int i, index = -2, min = -1;
if (!is_outermost_Start(n)) {
/**
* Returns index of the predecessor with the largest dfn number.
*/
-static int largest_dfn_pred(ir_node *n) {
+static int largest_dfn_pred(ir_node *n)
+{
int i, index = -2, max = -1;
if (!is_outermost_Start(n)) {
*
* @param n A node where uplink == dfn.
*/
-static ir_node *find_tail(ir_node *n) {
+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);
res_index = largest_dfn_pred (m);
break;
}
- if (m == n) { break; } /* It's not an unreachable loop, either. */
+ /* It's not an unreachable loop, either. */
+ if (m == n)
+ break;
}
//assert(0 && "no head found on stack");
}
/* 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));
+ ir_graph *irg = get_irn_irg(n);
+ ir_mode *mode = get_irn_mode(n);
+ ir_node *bad = new_r_Bad(irg, mode);
+ int arity = get_irn_arity(n);
for (i = -1; i < arity; ++i) {
set_irn_n(n, i, bad);
}
return is_outermost_Start(n) ? NULL : get_irn_n(m, res_index);
}
-
-#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);
-}
-
-
-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);
- }
-}
-
-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);
-}
-
-ir_node *get_projx_link(ir_node *cb_projx) {
- return((ir_node *) pmap_get(projx_link, (void *)cb_projx));
-}
-
-#endif
-
-static inline int is_outermost_loop(ir_loop *l) {
+static inline int is_outermost_loop(ir_loop *l)
+{
return l == get_loop_outer_loop(l);
}
-
/*-----------------------------------------------------------*
* The core algorithm. *
*-----------------------------------------------------------*/
*
* @param n node to start
*/
-static void scc(ir_node *n) {
+static void scc(ir_node *n)
+{
if (irn_visited_else_mark(n))
return;
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
l = current_loop;
close = 0;
}
-#else
- ir_loop *l = new_loop();
-#endif
/* Remove the loop from the stack ... */
pop_scc_unmark_visit(n);
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.
}
}
-#ifdef INTERPROCEDURAL_VIEW
-static void my_scc(ir_node *n) {
- int i;
- if (irn_visited_else_mark(n))
- return;
-
- /* 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 || is_Unknown(m)) 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 */
-
-/* Constructs backedge information for irg. In interprocedural view constructs
- backedges for all methods called by irg, too. */
-int construct_backedges(ir_graph *irg) {
+void 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_free(&temp, NULL);
assert(head_rem == current_loop);
- mature_loops(current_loop, irg->obst);
+ mature_loops(current_loop, get_irg_obstack(irg));
set_irg_loop(irg, current_loop);
- set_irg_loopinfo_state(irg, loopinfo_consistent);
+ add_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_LOOPINFO);
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
-static void reset_backedges(ir_node *n) {
+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
}
}
-
-/*
-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) {
+static void loop_reset_node(ir_node *n, void *env)
+{
(void) env;
set_irn_loop(n, NULL);
reset_backedges(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));
- */
+void free_loop_information(ir_graph *irg)
+{
irg_walk_graph(irg, loop_reset_node, NULL, NULL);
set_irg_loop(irg, NULL);
- set_irg_loopinfo_state(current_ir_graph, loopinfo_none);
+ clear_irg_properties(current_ir_graph, IR_GRAPH_PROPERTY_CONSISTENT_LOOPINFO);
/* 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
+void free_all_loop_information(void)
+{
+ size_t i;
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");
- }
-
- 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;
-}
-
-/** 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;
+static int is_loop_variant(ir_loop *l, ir_loop *b)
+{
+ size_t i, n_elems;
if (l == 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(const ir_node *n, const ir_node *block) {
+int is_loop_invariant(const ir_node *n, const ir_node *block)
+{
ir_loop *l = get_irn_loop(block);
const ir_node *b = is_Block(n) ? n : get_nodes_block(n);
return !is_loop_variant(l, get_irn_loop(b));
projects / libfirm / blobdiff