/*
- * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
+ * Copyright (C) 1995-2011 University of Karlsruhe. All right reserved.
*
* This file is part of libFirm.
*
* @brief Tail-recursion call optimization.
* @date 08.06.2004
* @author Michael Beck
- * @version $Id$
*/
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
+#include "config.h"
#include <string.h>
#include <assert.h>
#include "debug.h"
#include "iroptimize.h"
#include "scalar_replace.h"
-#include "array.h"
+#include "array_t.h"
#include "irprog_t.h"
#include "irgwalk.h"
#include "irgmod.h"
#include "irouts.h"
#include "irhooks.h"
#include "ircons_t.h"
-#include "xmalloc.h"
+#include "irpass.h"
-DEBUG_ONLY(static firm_dbg_module_t *dbg);
+DEBUG_ONLY(static firm_dbg_module_t *dbg;)
/**
* the environment for collecting data
*/
-typedef struct _collect_t {
+typedef struct collect_t {
ir_node *proj_X; /**< initial exec proj */
ir_node *block; /**< old first block */
int blk_idx; /**< cfgpred index of the initial exec in block */
/**
* walker for collecting data, fills a collect_t environment
*/
-static void collect_data(ir_node *node, void *env) {
- collect_t *data = env;
+static void collect_data(ir_node *node, void *env)
+{
+ collect_t *data = (collect_t*)env;
ir_node *pred;
- ir_op *op;
+ ir_opcode opcode;
switch (get_irn_opcode(node)) {
case iro_Proj:
pred = get_Proj_pred(node);
- op = get_irn_op(pred);
- if (op == op_Proj) {
+ opcode = (ir_opcode)get_irn_opcode(pred);
+ if (opcode == iro_Proj) {
ir_node *start = get_Proj_pred(pred);
- if (get_irn_op(start) == op_Start) {
+ if (is_Start(start)) {
if (get_Proj_proj(pred) == pn_Start_T_args) {
/* found Proj(ProjT(Start)) */
set_irn_link(node, data->proj_data);
data->proj_data = node;
}
}
- } else if (op == op_Start) {
+ } else if (opcode == iro_Start) {
if (get_Proj_proj(node) == pn_Start_X_initial_exec) {
/* found ProjX(Start) */
data->proj_X = node;
/*
* the first block has the initial exec as cfg predecessor
*/
- if (node != get_irg_start_block(current_ir_graph)) {
+ if (node != get_irg_start_block(get_irn_irg(node))) {
for (i = 0; i < n_pred; ++i) {
if (get_Block_cfgpred(node, i) == data->proj_X) {
data->block = node;
/**
* do the graph reconstruction for tail-recursion elimination
*
- * @param irg the graph that will reconstructed
- * @param rets linked list of all rets
- * @param n_tail_calls number of tail-recursion calls
+ * @param irg the graph that will reconstructed
+ * @param env tail recursion environment
*/
-static void do_opt_tail_rec(ir_graph *irg, tr_env *env) {
+static void do_opt_tail_rec(ir_graph *irg, tr_env *env)
+{
ir_node *end_block = get_irg_end_block(irg);
ir_node *block, *jmp, *call, *calls;
ir_node **in;
int rem = get_optimize();
ir_entity *ent = get_irg_entity(irg);
ir_type *method_tp = get_entity_type(ent);
- ir_graph *old = current_ir_graph;
-
- current_ir_graph = irg;
assert(env->n_tail_calls > 0);
- /* we add new nodes, so the outs are inconsistent */
- set_irg_outs_inconsistent(irg);
-
/* we add new blocks and change the control flow */
- set_irg_doms_inconsistent(irg);
- set_irg_extblk_inconsistent(irg);
-
- /* we add a new loop */
- set_irg_loopinfo_inconsistent(irg);
-
- /* calls are removed */
- set_trouts_inconsistent();
+ clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_DOMINANCE);
/* we must build some new nodes WITHOUT CSE */
set_optimize(0);
irg_walk_graph(irg, NULL, collect_data, &data);
/* check number of arguments */
- call = get_irn_link(end_block);
+ call = (ir_node*)get_irn_link(end_block);
n_params = get_Call_n_params(call);
assert(data.proj_X && "Could not find initial exec from Start");
/* allocate in's for phi and block construction */
NEW_ARR_A(ir_node *, in, env->n_tail_calls + 1);
- in[0] = data.proj_X;
+ /* build a new header block for the loop we create */
+ i = 0;
+ in[i++] = data.proj_X;
/* turn Return's into Jmp's */
- for (i = 1, p = env->rets; p; p = n) {
+ for (p = env->rets; p; p = n) {
ir_node *block = get_nodes_block(p);
- n = get_irn_link(p);
- in[i++] = new_r_Jmp(irg, block);
+ n = (ir_node*)get_irn_link(p);
+ in[i++] = new_r_Jmp(block);
// exchange(p, new_r_Bad(irg));
* the block to the keep-alive list */
add_End_keepalive(get_irg_end(irg), block);
}
+ assert(i == env->n_tail_calls + 1);
- /* create a new block at start */
- block = new_r_Block(irg, env->n_tail_calls + 1, in);
- jmp = new_r_Jmp(irg, block);
+ /* now create it */
+ block = new_r_Block(irg, i, in);
+ jmp = new_r_Jmp(block);
/* the old first block is now the second one */
set_Block_cfgpred(data.block, data.blk_idx, jmp);
/* build the memory phi */
i = 0;
- in[i] = new_r_Proj(irg, get_irg_start_block(irg), get_irg_start(irg), mode_M, pn_Start_M);
+ in[i] = new_r_Proj(get_irg_start(irg), mode_M, pn_Start_M);
set_irg_initial_mem(irg, in[i]);
++i;
- for (calls = call; calls; calls = get_irn_link(calls)) {
+ for (calls = call; calls != NULL; calls = (ir_node*)get_irn_link(calls)) {
in[i] = get_Call_mem(calls);
++i;
}
assert(i == env->n_tail_calls + 1);
- phis[0] = new_r_Phi(irg, block, env->n_tail_calls + 1, in, mode_M);
+ phis[0] = new_r_Phi(block, env->n_tail_calls + 1, in, mode_M);
/* build the data Phi's */
if (n_params > 0) {
ir_node *calls;
ir_node *args;
- ir_node *args_bl;
NEW_ARR_A(ir_node **, call_params, env->n_tail_calls);
/* collect all parameters */
- for (i = 0, calls = call; calls; calls = get_irn_link(calls)) {
+ for (i = 0, calls = call; calls != NULL;
+ calls = (ir_node*)get_irn_link(calls)) {
call_params[i] = get_Call_param_arr(calls);
++i;
}
/* build new Proj's and Phi's */
args = get_irg_args(irg);
- args_bl = get_nodes_block(args);
for (i = 0; i < n_params; ++i) {
ir_mode *mode = get_type_mode(get_method_param_type(method_tp, i));
- in[0] = new_r_Proj(irg, args_bl, args, mode, i);
+ in[0] = new_r_Proj(args, mode, i);
for (j = 0; j < env->n_tail_calls; ++j)
in[j + 1] = call_params[j][i];
- phis[i + 1] = new_r_Phi(irg, block, env->n_tail_calls + 1, in, mode);
+ phis[i + 1] = new_r_Phi(block, env->n_tail_calls + 1, in, mode);
}
}
long proj = get_Proj_proj(p);
assert(0 <= proj && proj < n_params);
- n = get_irn_link(p);
+ n = (ir_node*)get_irn_link(p);
exchange(p, phis[proj + 1]);
}
/* tail recursion was done, all info is invalid */
- set_irg_doms_inconsistent(irg);
- set_irg_outs_inconsistent(irg);
- set_irg_extblk_inconsistent(irg);
- set_irg_loopinfo_state(current_ir_graph, loopinfo_cf_inconsistent);
- set_trouts_inconsistent();
+ clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_DOMINANCE
+ | IR_GRAPH_PROPERTY_CONSISTENT_LOOPINFO);
set_irg_callee_info_state(irg, irg_callee_info_inconsistent);
set_optimize(rem);
/* check if we need new values */
n_locs = 0;
for (i = 0; i < env->n_ress; ++i) {
- if (env->variants[i] != TR_DIRECT)
+ if (env->variants[i] != TR_DIRECT) {
++n_locs;
+ break;
+ }
}
if (n_locs > 0) {
- ir_node *bad, *start_block;
+ ir_node *start_block;
ir_node **in;
ir_mode **modes;
- NEW_ARR_A(ir_node *, in, n_locs);
- NEW_ARR_A(ir_mode *, modes, n_locs);
- ssa_cons_start(irg, n_locs);
+ NEW_ARR_A(ir_node *, in, env->n_ress);
+ NEW_ARR_A(ir_mode *, modes, env->n_ress);
+ ssa_cons_start(irg, env->n_ress);
start_block = get_irg_start_block(irg);
- set_cur_block(start_block);
+ set_r_cur_block(irg, start_block);
+ /* set the neutral elements for the iteration start */
for (i = 0; i < env->n_ress; ++i) {
ir_type *tp = get_method_res_type(method_tp, i);
ir_mode *mode = get_type_mode(tp);
modes[i] = mode;
if (env->variants[i] == TR_ADD) {
- set_value(i, new_Const(mode, get_mode_null(mode)));
+ set_r_value(irg, i, new_r_Const(irg, get_mode_null(mode)));
} else if (env->variants[i] == TR_MUL) {
- set_value(i, new_Const(mode, get_mode_one(mode)));
+ set_r_value(irg, i, new_r_Const(irg, get_mode_one(mode)));
}
}
mature_immBlock(start_block);
/* no: we can kill all returns */
- bad = get_irg_bad(irg);
-
for (p = env->rets; p; p = n) {
ir_node *block = get_nodes_block(p);
- ir_node *call, *mem, *jmp, *tuple;
-
- set_cur_block(block);
- n = get_irn_link(p);
+ ir_node *jmp, *tuple;
- call = skip_Proj(get_Return_mem(p));
- assert(is_Call(call));
+ set_r_cur_block(irg, block);
+ n = (ir_node*)get_irn_link(p);
- mem = get_Call_mem(call);
+ ir_node *const call = skip_Proj(get_Return_mem(p));
+ ir_node *const mem = get_Call_mem(call);
/* create a new jump, free of CSE */
set_optimize(0);
- jmp = new_Jmp();
+ jmp = new_r_Jmp(block);
set_optimize(rem);
for (i = 0; i < env->n_ress; ++i) {
+ ir_mode *mode = modes[i];
if (env->variants[i] != TR_DIRECT) {
- in[i] = get_value(i, modes[i]);
+ in[i] = get_r_value(irg, i, mode);
} else {
- in[i] = bad;
+ in[i] = new_r_Bad(irg, mode);
}
}
/* create a new tuple for the return values */
- tuple = new_Tuple(env->n_ress, in);
+ tuple = new_r_Tuple(block, env->n_ress, in);
- turn_into_tuple(call, pn_Call_max);
- set_Tuple_pred(call, pn_Call_M, mem);
- set_Tuple_pred(call, pn_Call_X_regular, jmp);
- set_Tuple_pred(call, pn_Call_X_except, bad);
- set_Tuple_pred(call, pn_Call_T_result, tuple);
- set_Tuple_pred(call, pn_Call_M_except, mem);
- set_Tuple_pred(call, pn_Call_P_value_res_base, bad);
+ turn_into_tuple(call, pn_Call_max+1);
+ set_Tuple_pred(call, pn_Call_M, mem);
+ set_Tuple_pred(call, pn_Call_X_regular, jmp);
+ set_Tuple_pred(call, pn_Call_X_except, new_r_Bad(irg, mode_X));
+ set_Tuple_pred(call, pn_Call_T_result, tuple);
for (i = 0; i < env->n_ress; ++i) {
ir_node *res = get_Return_res(p, i);
if (env->variants[i] != TR_DIRECT) {
- set_value(i, res);
+ set_r_value(irg, i, res);
}
}
- exchange(p, bad);
+ exchange(p, new_r_Bad(irg, mode_X));
}
/* finally fix all other returns */
end_block = get_irg_end_block(irg);
for (i = get_Block_n_cfgpreds(end_block) - 1; i >= 0; --i) {
ir_node *ret = get_Block_cfgpred(end_block, i);
+ ir_node *block;
/* search all Returns of a block */
if (! is_Return(ret))
continue;
- set_cur_block(get_nodes_block(ret));
+ block = get_nodes_block(ret);
+ set_r_cur_block(irg, block);
for (j = 0; j < env->n_ress; ++j) {
ir_node *pred = get_Return_res(ret, j);
ir_node *n;
continue;
case TR_ADD:
- n = get_value(j, modes[j]);
- n = new_Add(n, pred, modes[j]);
+ n = get_r_value(irg, j, modes[j]);
+ n = new_r_Add(block, n, pred, modes[j]);
set_Return_res(ret, j, n);
break;
case TR_MUL:
- n = get_value(j, modes[j]);
- n = new_Mul(n, pred, modes[j]);
+ n = get_r_value(irg, j, modes[j]);
+ n = new_r_Mul(block, n, pred, modes[j]);
set_Return_res(ret, j, n);
break;
}
ssa_cons_finish(irg);
} else {
- ir_node *bad = get_irg_bad(irg);
+ ir_node *bad = new_r_Bad(irg, mode_X);
/* no: we can kill all returns */
for (p = env->rets; p; p = n) {
- n = get_irn_link(p);
+ n = (ir_node*)get_irn_link(p);
exchange(p, bad);
}
}
- current_ir_graph = old;
}
/**
*
* @return non-zero if it's ok to do tail recursion
*/
-static int check_lifetime_of_locals(ir_graph *irg) {
- ir_node *irg_frame, *irg_val_param_base;
+static int check_lifetime_of_locals(ir_graph *irg)
+{
+ ir_node *irg_frame;
int i;
+ ir_type *frame_tp = get_irg_frame_type(irg);
irg_frame = get_irg_frame(irg);
for (i = get_irn_n_outs(irg_frame) - 1; i >= 0; --i) {
ir_node *succ = get_irn_out(irg_frame, i);
- if (is_Sel(succ) && is_address_taken(succ))
- return 0;
- }
-
- /* Check if we have compound arguments.
- For now, we cannot handle them, */
- irg_val_param_base = get_irg_value_param_base(irg);
- if (get_irn_n_outs(irg_val_param_base) > 0)
- return 0;
+ if (is_Sel(succ)) {
+ /* Check if we have compound arguments.
+ For now, we cannot handle them, */
+ if (get_entity_owner(get_Sel_entity(succ)) != frame_tp)
+ return 0;
+ if (is_address_taken(succ))
+ return 0;
+ }
+ }
return 1;
}
/**
* Examine irn and detect the recursion variant.
*/
-static tail_rec_variants find_variant(ir_node *irn, ir_node *call) {
+static tail_rec_variants find_variant(ir_node *irn, ir_node *call)
+{
ir_node *a, *b;
tail_rec_variants va, vb, res;
case iro_Add:
/* try additive */
a = get_Add_left(irn);
- if (get_irn_MacroBlock(a) != get_irn_MacroBlock(call)) {
+ if (get_nodes_block(a) != get_nodes_block(call)) {
/* we are outside, ignore */
va = TR_UNKNOWN;
} else {
return TR_BAD;
}
b = get_Add_right(irn);
- if (get_irn_MacroBlock(b) != get_irn_MacroBlock(call)) {
+ if (get_nodes_block(b) != get_nodes_block(call)) {
/* we are outside, ignore */
vb = TR_UNKNOWN;
} else {
return TR_BAD;
case iro_Sub:
- /* try additive, but return value mut be left */
+ /* try additive, but return value must be left */
a = get_Sub_left(irn);
- if (get_irn_MacroBlock(a) != get_irn_MacroBlock(call)) {
+ if (get_nodes_block(a) != get_nodes_block(call)) {
/* we are outside, ignore */
va = TR_UNKNOWN;
} else {
return TR_BAD;
}
b = get_Sub_right(irn);
- if (get_irn_MacroBlock(b) != get_irn_MacroBlock(call)) {
+ if (get_nodes_block(b) != get_nodes_block(call)) {
/* we are outside, ignore */
vb = TR_UNKNOWN;
} else {
case iro_Mul:
/* try multiplicative */
a = get_Mul_left(irn);
- if (get_irn_MacroBlock(a) != get_irn_MacroBlock(call)) {
+ if (get_nodes_block(a) != get_nodes_block(call)) {
/* we are outside, ignore */
va = TR_UNKNOWN;
} else {
return TR_BAD;
}
b = get_Mul_right(irn);
- if (get_irn_MacroBlock(b) != get_irn_MacroBlock(call)) {
+ if (get_nodes_block(b) != get_nodes_block(call)) {
/* we are outside, ignore */
vb = TR_UNKNOWN;
} else {
/*
* convert simple tail-calls into loops
*/
-int opt_tail_rec_irg(ir_graph *irg) {
- tr_env env;
- ir_node *end_block;
- int i, n_ress, n_tail_calls = 0;
- ir_node *rets = NULL;
- ir_type *mtd_type, *call_type;
- ir_entity *ent;
+void opt_tail_rec_irg(ir_graph *irg)
+{
+ tr_env env;
+ ir_node *end_block;
+ int i, n_ress, n_tail_calls = 0;
+ ir_node *rets = NULL;
+ ir_type *mtd_type, *call_type;
+ ir_entity *ent;
+ ir_graph *rem;
+
+ assure_irg_properties(irg,
+ IR_GRAPH_PROPERTY_MANY_RETURNS
+ | IR_GRAPH_PROPERTY_NO_BADS
+ | IR_GRAPH_PROPERTY_CONSISTENT_OUTS);
- assure_irg_outs(irg);
+ FIRM_DBG_REGISTER(dbg, "firm.opt.tailrec");
- if (! check_lifetime_of_locals(irg))
- return 0;
+ if (! check_lifetime_of_locals(irg)) {
+ confirm_irg_properties(irg, IR_GRAPH_PROPERTIES_ALL);
+ return;
+ }
+ rem = current_ir_graph;
+ current_ir_graph = irg;
ent = get_irg_entity(irg);
mtd_type = get_entity_type(ent);
- n_ress = get_method_n_ress(mtd_type);
+ n_ress = get_method_n_ress(mtd_type);
env.variants = NULL;
env.n_ress = n_ress;
env.variants[i] = TR_DIRECT;
}
- /*
- * This tail recursion optimization works best
- * if the Returns are normalized.
- */
- normalize_n_returns(irg);
+ ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK);
end_block = get_irg_end_block(irg);
set_irn_link(end_block, NULL);
/* check if it's a recursive call */
call_ptr = get_Call_ptr(call);
- if (! is_Global(call_ptr))
+ if (! is_SymConst_addr_ent(call_ptr))
continue;
- ent = get_Global_entity(call_ptr);
+ ent = get_SymConst_entity(call_ptr);
if (!ent || get_entity_irg(ent) != irg)
continue;
* This can happen in C when no prototype is given
* or K&R style is used.
*/
-#if 0
- printf("Warning: Tail recursion fails because of different method and call types:\n");
- dump_type(mtd_type);
- dump_type(call_type);
-#endif
+ DB((dbg, LEVEL_3, " tail recursion fails because of call type mismatch: %+F != %+F\n", mtd_type, call_type));
continue;
}
/* cannot be transformed */
break;
}
- if (var == TR_DIRECT)
+ if (var == TR_DIRECT) {
var = env.variants[j];
- else if (env.variants[j] == TR_DIRECT)
+ } else if (env.variants[j] == TR_DIRECT) {
env.variants[j] = var;
+ }
if (env.variants[j] != var) {
/* not compatible */
+ DB((dbg, LEVEL_3, " tail recursion fails for %d return value of %+F\n", j, ret));
break;
}
}
}
/* now, end_block->link contains the list of all tail calls */
- if (n_tail_calls <= 0)
- return 0;
-
- DB((dbg, LEVEL_2, " Performing tail recursion for graph %s and %d Calls\n",
- get_entity_ld_name(get_irg_entity(irg)), n_tail_calls));
+ if (n_tail_calls > 0) {
+ DB((dbg, LEVEL_2, " Performing tail recursion for graph %s and %d Calls\n",
+ get_entity_ld_name(get_irg_entity(irg)), n_tail_calls));
- hook_tail_rec(irg, n_tail_calls);
+ hook_tail_rec(irg, n_tail_calls);
- env.n_tail_calls = n_tail_calls;
- env.rets = rets;
- do_opt_tail_rec(irg, &env);
+ env.n_tail_calls = n_tail_calls;
+ env.rets = rets;
+ do_opt_tail_rec(irg, &env);
+ confirm_irg_properties(irg, IR_GRAPH_PROPERTIES_NONE);
+ } else {
+ confirm_irg_properties(irg, IR_GRAPH_PROPERTIES_ALL);
+ }
+ ir_free_resources(irg, IR_RESOURCE_IRN_LINK);
+ current_ir_graph = rem;
+}
- return n_tail_calls;
+ir_graph_pass_t *opt_tail_rec_irg_pass(const char *name)
+{
+ return def_graph_pass(name ? name : "tailrec", opt_tail_rec_irg);
}
/*
* optimize tail recursion away
*/
-void opt_tail_recursion(void) {
- int i;
- int n_opt_applications = 0;
- ir_graph *irg;
+void opt_tail_recursion(void)
+{
+ size_t i, n;
FIRM_DBG_REGISTER(dbg, "firm.opt.tailrec");
- for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
- irg = get_irp_irg(i);
-
- current_ir_graph = irg;
-
- if (opt_tail_rec_irg(irg))
- ++n_opt_applications;
+ DB((dbg, LEVEL_1, "Performing tail recursion ...\n"));
+ for (i = 0, n = get_irp_n_irgs(); i < n; ++i) {
+ ir_graph *irg = get_irp_irg(i);
+ opt_tail_rec_irg(irg);
}
+}
- DB((dbg, LEVEL_1, "Performed tail recursion for %d of %d graphs\n",
- n_opt_applications, get_irp_n_irgs()));
+ir_prog_pass_t *opt_tail_recursion_pass(const char *name)
+{
+ return def_prog_pass(name ? name : "tailrec", opt_tail_recursion);
}
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