*
* Implementation of the RA-Interface for an external, (non-SSA) register allocator.
*
- * The external register allocator is a program taking 2 arguments:
- * 1) An input file in which the cfg is defined
- * 2) An output file containing the essential actions performed during allocation
+ * The external register allocator is a program:
+ * PROG -i INPUTFILE -o OUTPUTFILE
+ *
+ * 1) Input file defines the interference graph
+ * 2) Output file contains the instructions to perform
*
The input file format
----------------------
-inputfile ::= regs cfg .
-
-regs ::= 'regs' regcount 'saved-by-caller' reg-list 'saved-by-callee' reg-list . // Anzahl der register (0..regcount-1), die zur Verfuegung stehen
-
-reg-list ::= reg-nr
- | reg-nr reg-list
+inputfile ::= regs nodes interf affinities .
-cfg ::= 'cfg' ident '{' block* edge* '}' . // Steuerflussgraph der Prozedur
+regs ::= 'regs' regcount . // Anzahl der register (0..regcount-1), die zur Verfuegung stehen
-block ::= 'block' block-nr '{' insn* '}' . // Grundblock im cfg versehen mit einer nummer
+nodes ::= 'nodes' '{' node* '}' . // All nodes in the graph
-edge ::= 'cf-edge' block-nr block-nr . // Steuerflusskante src-->tgt
+node ::= node-info
+ | node-info '<' reg-nr '>' . // Reg-nr is present in case of constraints
-insn ::= gen-insn // Befehl in einem block
- | copy-insn .
+node-info ::= node-nr spill-costs .
-gen-insn ::= 'insn' insn-nr '{' uses defs '}' .
-copy-insn ::= 'copy' insn-nr '{' uses defs '}' .
-call-insn ::= 'call' insn-nr '{' uses defs '}' .
+interf ::= 'interferences' '{' i-edge* '}' . // Interference edges of the graph
-defs ::= 'def' var-list . // Liste der definierten/verwendeten Variablen
-uses ::= 'use' var-list .
+i-edge ::= '(' node-nr ',' node-nr ')' .
-var-list ::= var-ref
- | var-ref var-list .
+affinities ::= 'affinities' '{' a-edge* '}' . // Affinity edges of the graph
-var-ref ::= var-nr
- | var-nr '<' reg-nr '>' . // reg-nr gibt register constraint an.
+a-edge ::= '(' node-nr ',' node-nr ',' weight ')' .
-ident ::= non-whitespace-char* .
-regcount, block-nr, insn-nr, reg-nr, var-nr ::= integer .
-
+weight, regcount, node-nr ::= int32 .
+spill-costs ::= int32 . // negative spill costs indicate unspillable
The output file format
-----------------------
-outputfile ::= action* assign*.
-
-action ::= 'spill' loc var-nr // insert a spill spill(var-nr);
- | 'reload' loc new-var-nr var-nr // insert a reload new-var-nr := reload(var-nr);
- | 'setarg' insn-nr pos var-nr // change a usage to insn(..., var-nr, ...) (equals set_irn_n)
- | 'copy' loc var-nr var-nr // insert a copy var-nr[1] := var-nr[2];
+outputfile ::= spills | allocs .
-assign ::= 'assign' var-nr reg-nr . // assign var-nr the register reg-nr
+spills ::= 'spills' node-nr+ .
-loc ::= 'before' insn-nr
- | 'after' insn-nr .
-
-
-Constraints for output file
----------------------------
-1) The returned actions must result in a non-ssa-program
- equivalent to the former input.
-2) All names (numbers) must be defined before their first use.
- Numbers already occuring in the input file are implicitly defined in the output file.
-3) All spills of a variable must precede the first reload of this variable
-4) Each reload must define a new variable name
+allocs ::= 'allocs' alloc* .
+alloc ::= node-nr reg-nr .
******** End of file format docu ********/
#include <stdio.h>
#include <stdlib.h>
+#include <limits.h>
#ifdef WITH_LIBCORE
#include <libcore/lc_opts.h>
#include <libcore/lc_opts_enum.h>
#include "irnode_t.h"
#include "irgraph_t.h"
#include "irgwalk.h"
+#include "iredges_t.h"
#include "irdom_t.h"
#include "phiclass.h"
#include "beirgmod.h"
#include "besched.h"
#include "beutil.h"
+#include "belive_t.h"
+
+#define DBG_LEVEL 2
typedef struct _var_info_t var_info_t;
* Environment with all the needed stuff
*/
typedef struct _be_raext_env_t {
+ firm_dbg_module_t *dbg;
arch_env_t *aenv;
const arch_register_class_t *cls;
ir_graph *irg;
dom_front_info_t *dom_info;
- FILE *f; /**< file handle used for out- and input file */
- set *vars; /**< contains all var_info_t */
- pmap *nodes; /**< maps nodes numbers (int) to the node (ir_node*) having that node_nr */
+ FILE *f; /**< file handle used for out- and input file */
+ set *vars; /**< contains all var_info_t */
+ int n_cls_vars; /**< length of the array cls_vars */
+ var_info_t **cls_vars; /**< only the var_infos for current cls. needed for double iterating */
} be_raext_env_t;
#define pset_foreach(pset, irn) for(irn=pset_first(pset); irn; irn=pset_next(pset))
#define set_foreach(set, e) for(e=set_first(set); e; e=set_next(set))
-
/**
* Checks if _the_ result of the irn belongs to the
* current register class (raenv->cls)
*/
#define is_res_in_reg_class(irn) arch_irn_has_reg_class(raenv->aenv, irn, -1, raenv->cls)
+static INLINE ir_node *get_first_non_phi(pset *s) {
+ ir_node *irn;
+
+ pset_foreach(s, irn)
+ if (!is_Phi(irn)) {
+ pset_break(s);
+ return irn;
+ }
-/**
- * Checks if the irn uses or defines values of the
- * current register class (raenv->cls)
- */
-static INLINE int is_sth_in_reg_class(be_raext_env_t *raenv, const ir_node *irn) {
- int max, i;
-
- /* check arguments */
- for (i=0, max=get_irn_arity(irn); i<max; ++i)
- if (arch_irn_has_reg_class(raenv->aenv, get_irn_n(irn, i), -1, raenv->cls))
- return 1;
-
- /* check result(s) */
- if (get_irn_mode(irn) == mode_T) {
- ir_node *proj;
- for (proj = sched_next(irn); is_Proj(proj); proj = sched_next(proj))
- if (arch_irn_has_reg_class(raenv->aenv, proj, -1, raenv->cls))
- return 1;
- return 0;
- } else {
- return arch_irn_has_reg_class(raenv->aenv, irn, -1, raenv->cls);
+ assert(0 && "There must be a non-phi-irn in this");
+ return NULL;
+}
+
+static INLINE ir_node *get_first_phi(pset *s) {
+ ir_node *irn;
+
+ pset_foreach(s, irn)
+ if (is_Phi(irn)) {
+ pset_break(s);
+ return irn;
+ }
+
+ assert(0 && "There must be a phi in this");
+ return NULL;
+}
+
+static int get_loop_weight(ir_node *irn) {
+ int cost = 0;
+ ir_loop *loop = get_irn_loop(get_nodes_block(irn));
+
+ if (loop) {
+ int d = get_loop_depth(loop);
+ cost = d*d;
+ }
+ return cost+1;
+}
+
+#define get_const_weight(irn) (1)
+
+#define get_spill_weight(irn) get_loop_weight(irn)
+#define get_reload_weight(irn) get_loop_weight(irn)
+#define get_affinity_weight(irn) get_loop_weight(irn)
+
+/******************************************************************************
+ _____ _ _____ _
+ / ____| | | / ____| (_)
+ | | ___ _ __ ___| |_ _ __ | | ___ _ __ _ ___ ___
+ | | / _ \| '_ \/ __| __| '__| | | / _ \| '_ \| |/ _ \/ __|
+ | |___| (_) | | | \__ \ |_| | | |___| (_) | |_) | | __/\__ \
+ \_____\___/|_| |_|___/\__|_| \_____\___/| .__/|_|\___||___/
+ | |
+ |_|
+ *****************************************************************************/
+
+static void handle_constraints_walker(ir_node *irn, void *env) {
+ be_raext_env_t *raenv = env;
+ arch_register_req_t req;
+ int pos, max;
+
+ /* handle output constraints
+ * user -> irn becomes user -> cpy -> irn
+ */
+ arch_get_register_req(raenv->aenv, &req, irn, -1);
+ if (arch_register_req_is(&req, limited)) {
+ ir_node *cpy = be_new_Copy(req.cls, raenv->irg, get_nodes_block(irn), irn);
+ const ir_edge_t *edge;
+
+ /* all users of the irn use the copy instead */
+ sched_add_after(irn, cpy);
+ foreach_out_edge(irn, edge)
+ set_irn_n(edge->src, edge->pos, cpy);
}
- assert(0 && "Where did you come from???");
+
+ /* handle input constraints by converting them into output constraints
+ * of copies of the former argument
+ * irn -> arg becomes irn -> copy -> arg
+ */
+ for (pos = 0, max = get_irn_arity(irn); pos<max; ++pos) {
+ arch_get_register_req(raenv->aenv, &req, irn, pos);
+ if (arch_register_req_is(&req, limited)) {
+ ir_node *arg = get_irn_n(irn, pos);
+ ir_node *cpy = be_new_Copy(req.cls, raenv->irg, get_nodes_block(irn), arg);
+
+ /* use the copy instead */
+ sched_add_before(irn, cpy);
+ set_irn_n(irn, pos, cpy);
+
+ /* set an out constraint for the copy */
+ be_set_constr_limited(cpy, -1, &req);
+ }
+ }
}
+static void handle_constraints(be_raext_env_t *raenv) {
+ irg_block_walk_graph(raenv->irg, NULL, handle_constraints_walker, raenv);
+}
+
+
/******************************************************************************
_____ _____ _____ _
/ ____/ ____| /\ | __ \ | |
static void ssa_destr_rastello(be_raext_env_t *raenv) {
assert(0 && "NYI");
- /* TODO
+ exit(0xDeadBeef);
+ /*
phi_class_compute(raenv->irg);
irg_block_walk_graph(irg, ssa_destr_rastello, NULL, &raenv);
*/
*****************************************************************************/
/**
- * This struct maps a variable (nr) to
- * 1) the values belonging to this variable
- * 2) the spills of this variable
+ * This struct maps a variable (nr) to the values belonging to this variable
*/
struct _var_info_t {
- int var_nr; /* the key for comparesion */
+ int var_nr; /* the key */
pset *values; /* the ssa-values belonging to this variable */
- pset *spills; /* the spills of this variable */
- pset *reloads; /* the relaods of this variable */
- unsigned reload_phase:1; /* 0 initially, 1 if a reload of this var has been inserted */
};
+#define SET_REMOVED -1
+
/**
* The link field of an irn points to the var_info struct
* representing the corresponding variable.
#define set_var_info(irn, vi) set_irn_link(irn, vi)
#define get_var_info(irn) ((var_info_t *)get_irn_link(irn))
-/* TODO insn-nr handling if ext defines new ones */
-#define pmap_insert_sth(pmap, key, val) pmap_insert(pmap, (void *)key, (void *)val)
-#define pmap_get_sth(pmap, key) pmap_get(pmap, (void *)key)
-
-
#define HASH_VAR_NR(var_nr) var_nr
-
-
static int compare_var_infos(const void *e1, const void *e2, size_t size) {
const var_info_t *v1 = e1;
const var_info_t *v2 = e2;
+ if (v1->var_nr == SET_REMOVED || v2->var_nr == SET_REMOVED)
+ return 1;
+
return v1->var_nr != v2->var_nr;
}
found = set_insert(vars, &vi, sizeof(vi), HASH_VAR_NR(var_nr));
- if (!found->values) {
+ if (!found->values)
found->values = pset_new_ptr(1);
- found->spills = pset_new_ptr(1);
- found->reloads = pset_new_ptr(1);
- }
return found;
}
return vi;
}
-/**
- * Adds a spill to a variable. Sets all pointers accordingly.
- */
-static INLINE var_info_t *var_add_spill(be_raext_env_t *raenv, int var_to_spill, ir_node *before) {
- var_info_t *vi = var_find_or_insert(raenv->vars, var_to_spill);
- ir_node *blk, *tospill, *spill;
-
- assert(pset_count(vi->values) && "There are no values associated to this variable (yet?)");
- assert(!vi->reload_phase && "I have already seen a reload for this variable, so you cant spill anymore!");
-
- /* add spill to graph and schedule */
- blk = get_nodes_block(before);
- tospill = dom_up_search(vi->values, before); /* which value gets spilled */
- spill = be_new_Spill(raenv->cls, raenv->irg, blk, tospill, tospill); /* the corresponding spill node */
-
- sched_add_before(before, spill);
-
- /* the spill also points to the var_info of the spilled node */
- set_var_info(spill, vi);
-
- /* remember the spill */
- pset_insert_ptr(vi->spills, spill);
-
- return vi;
-}
-
-/**
- * Adds a reload to a variable. Sets all pointers accordingly.
- */
-static INLINE var_info_t *var_add_reload(be_raext_env_t *raenv, int var_to_reload, int var_nr_for_reload, ir_node *before) {
- var_info_t *vi = var_find_or_insert(raenv->vars, var_to_reload);
- ir_node *blk, *spill, *reload;
-
- assert(pset_count(vi->spills) && "There are no spills associated to this variable (yet?)");
- /* now we enter the reload phase, so no more spills are allowed */
- vi->reload_phase = 1;
-
- /* add reload to graph and schedule */
- blk = get_nodes_block(before);
- spill = pset_first(vi->spills); /* For now use an arbitrary spill node. This is corrected later in fix_reloads */
- pset_break(vi->spills);
- reload = be_new_Reload(raenv->cls, raenv->irg, blk, get_irn_mode(get_irn_n(spill, 0)), spill);
-
- sched_add_before(before, reload);
-
- /* create a new variable for the result of the reload */
- assert(!var_find(raenv->vars, var_nr_for_reload) && "Each reload must define a new variable");
- var_add_value(raenv, var_nr_for_reload, reload);
-
- /* remember the reload */
- pset_insert_ptr(vi->reloads, reload);
-
- return vi;
-}
-
static INLINE pset *get_var_values(be_raext_env_t *raenv, int var_nr) {
var_info_t *vi = var_find(raenv->vars, var_nr);
- assert(vi && "Variable does not (yet?) exist");
+ assert(vi && "Variable does not exist");
return vi->values;
}
-static INLINE pset *get_var_spills(be_raext_env_t *raenv, int var_nr) {
- var_info_t *vi = var_find(raenv->vars, var_nr);
- assert(vi && "Variable does not (yet?) exist");
- return vi->spills;
-}
-
-static INLINE pset *get_var_reloads(be_raext_env_t *raenv, int var_nr) {
- var_info_t *vi = var_find(raenv->vars, var_nr);
- assert(vi && "Variable does not (yet?) exist");
- return vi->reloads;
-}
-
/**
* Define variables (numbers) for all SSA-values.
* All values in a phi class get assigned the same variable name.
*/
static void values_to_vars(ir_node *irn, void *env) {
be_raext_env_t *raenv = env;
- ir_node *n;
int nr;
pset *vals;
+ if(arch_get_irn_reg_class(raenv->aenv, irn, -1) == NULL)
+ return;
+
vals = get_phi_class(irn);
- if (!vals) {
+ if (vals) {
+ nr = get_irn_node_nr(get_first_phi(vals));
+ } else {
/* not a phi class member, value == var */
+ nr = get_irn_node_nr(irn);
vals = pset_new_ptr(1);
pset_insert_ptr(vals, irn);
}
/* values <--> var mapping */
- n = pset_first(vals);
- nr = get_irn_node_nr(n);
- for (; n; n=pset_next(vals))
- var_add_value(raenv, nr, n);
+ pset_foreach(vals, irn) {
+ DBG((raenv->dbg, 0, "Var %d contains %+F\n", nr, irn));
+ var_add_value(raenv, nr, irn);
+ }
}
+
/******************************************************************************
- _ _____ _ _
- /\ | | | __ \ | | |
- / \ _ __ _ __ | |_ _ | |__) |___ ___ _ _| | |_
- / /\ \ | '_ \| '_ \| | | | | | _ // _ \/ __| | | | | __|
- / ____ \| |_) | |_) | | |_| | | | \ \ __/\__ \ |_| | | |_
- /_/ \_\ .__/| .__/|_|\__, | |_| \_\___||___/\__,_|_|\__|
- | | | | __/ |
- |_| |_| |___/
+ _____
+ | __ \
+ | | | |_ _ _ __ ___ _ __ ___ _ __
+ | | | | | | | '_ ` _ \| '_ \ / _ \ '__|
+ | |__| | |_| | | | | | | |_) | __/ |
+ |_____/ \__,_|_| |_| |_| .__/ \___|_|
+ | |
+ |_|
*****************************************************************************/
-#define INVALID_FILE_FORMAT assert(0 && "Invalid file format.")
-
-static INLINE int is_before(const char *s, size_t len) {
- if (!strncmp(s, "before", len))
- return 1;
- if (!strncmp(s, "after", len))
- return 0;
- INVALID_FILE_FORMAT;
- return -1;
-}
-static void fix_reloads(be_raext_env_t *raenv) {
+static void extract_vars_of_cls(be_raext_env_t *raenv) {
+ int count = 0;
var_info_t *vi;
+
+ raenv->cls_vars = malloc(set_count(raenv->vars) * sizeof(*raenv->cls_vars));
+ assert(raenv->cls_vars);
+
set_foreach(raenv->vars, vi)
- be_introduce_copies_pset(raenv->dom_info, vi->spills);
+ if (is_res_in_reg_class(get_first_non_phi(vi->values)))
+ raenv->cls_vars[count++] = vi;
+
+ raenv->cls_vars = realloc(raenv->cls_vars, count * sizeof(*raenv->cls_vars));
+ assert(raenv->cls_vars);
+
+ raenv->n_cls_vars = count;
}
+
/**
- * Read in the actions performed by the external allocator.
- * Apply these transformations to the irg.
+ * Check if node irn has a limited-constraint at position pos.
+ * If yes, dump it to FILE raenv->f
*/
-static void read_and_apply_results(be_raext_env_t *raenv, char *filename) {
- FILE *f;
- var_info_t *vi;
- int phase=0;
+static INLINE void dump_constraint(be_raext_env_t *raenv, ir_node *irn, int pos) {
+ bitset_t *bs = bitset_alloca(raenv->cls->n_regs);
+ arch_register_req_t req;
- if (!(f = fopen(filename, "rt"))) {
- fprintf(stderr, "Could not open file %s for reading\n", filename);
- exit(0xdeadbeef);
+ arch_get_register_req(raenv->aenv, &req, irn, pos);
+ if (arch_register_req_is(&req, limited)) {
+ int reg_nr;
+ req.limited(req.limited_env, bs);
+ reg_nr = bitset_next_set(bs, 0);
+ fprintf(raenv->f, "<%d>", reg_nr);
+ assert(-1 == bitset_next_set(bs, reg_nr+1) && "Constraints with more than 1 possible register are not supported");
}
- raenv->f = f;
-
-
-
- /* parse the file */
- while (phase == 0) {
- int loc, var_use_ident, var_def_ident, pos;
- char where[16];
+}
- /* handle a spill */
- if (fscanf(f, " spill %6s %d %d ", &where, &loc, &var_use_ident) == 3) {
+#define UNSPILLABLE -1
- /* determine the node to insert the spill before */
- ir_node *anchor = pmap_get_sth(raenv->nodes, loc);
- assert(anchor && "insn-nr does not exist");
- if (!is_before(where, sizeof(where)))
- anchor = sched_next(anchor);
+static INLINE int get_spill_costs(be_raext_env_t *raenv, var_info_t *vi) {
+ ir_node *irn;
+ int c_spills=0, c_reloads=0;
- var_add_spill(raenv, var_use_ident, anchor);
+ pset_foreach(vi->values, irn) {
+ if (arch_irn_is_ignore(raenv->aenv, irn) || be_is_Reload(irn)) {
+ pset_break(vi->values);
+ return UNSPILLABLE;
}
- /* handle a reload */
- else if (fscanf(f, " reload %s %d %d %d ", &where, &loc, &var_def_ident, &var_use_ident) == 4) {
-
- /* determine the node to insert the spill before */
- ir_node *anchor = pmap_get_sth(raenv->nodes, loc);
- assert(anchor && "insn-nr does not exist");
- if (!is_before(where, sizeof(where)))
- anchor = sched_next(anchor);
-
- var_add_reload(raenv, var_use_ident, var_def_ident, anchor);
+ if (is_Phi(irn)) {
+ /* number of reloads is the number of non-phi uses of all values of this var */
+ const ir_edge_t *edge;
+ foreach_out_edge(irn, edge)
+ if (!is_Phi(edge->src))
+ c_reloads += get_reload_weight(edge->src);
+ } else {
+ /* number of spills is the number of non-phi values for this var */
+ c_spills += get_spill_weight(irn);
}
+ }
- /* handle a set_irn_n */
- else if (fscanf(f, " setarg %d %d %d ", &loc, &pos, &var_use_ident) == 3) {
- ir_node *to_change, *new_arg;
- var_info_t *vi = var_find(raenv->vars, var_use_ident);
- assert(vi && vi->values && "New argument does not exist");
+ return c_spills + c_reloads;
+}
- to_change = pmap_get_sth(raenv->nodes, loc);
- assert(to_change && "insn-nr does not exist");
+static void dump_nodes(be_raext_env_t *raenv) {
+ FILE *f = raenv->f;
+ int i;
- new_arg = dom_up_search(vi->values, to_change);
- set_irn_n(to_change, pos, new_arg);
- }
+ fprintf(f, "\nnodes {\n");
- /* handle a copy insertion */
- else if (fscanf(f, " copy %s %d %d %d ", &where, &loc, &var_def_ident, &var_use_ident) == 4) {
- /* TODO
- Ziel der Kopie ist Variable die bereits existiert
- Ziel der Kopie ist eine neue Variable
- */
- }
+ for (i=0; i<raenv->n_cls_vars; ++i) {
+ var_info_t *vi = raenv->cls_vars[i];
- else
- phase++;
- }
+ if (vi->var_nr == SET_REMOVED)
+ continue;
- fix_reloads(raenv);
+ fprintf(f, "%d %d", vi->var_nr, get_spill_costs(raenv, vi));
+ dump_constraint(raenv, get_first_non_phi(vi->values), -1);
+ fprintf(f, "\n");
+ }
- while (phase == 1) {
- int var_use_ident, reg_nr;
+ fprintf(f, "}\n");
+ fflush(f);
+}
- /* assign register */
- if (fscanf(f, " assign %d %d ", &var_use_ident, ®_nr) == 2) {
- pset *vals = get_var_values(raenv, var_use_ident);
- ir_node *irn;
- assert(vals && "Variable does not (yet?) exist!");
- pset_foreach(vals, irn)
- arch_set_irn_register(raenv->aenv, irn, arch_register_for_index(raenv->cls, var_use_ident));
- }
- else
- phase++;
- }
+static void dump_interferences(be_raext_env_t *raenv) {
+ int i,o;
+ var_info_t *vi1, *vi2;
+ ir_node *irn1, *irn2;
+ FILE *f = raenv->f;
- if (!feof(f))
- INVALID_FILE_FORMAT;
+ fprintf(f, "\ninterferences {\n");
- fclose(f);
+ for (i=0; i<raenv->n_cls_vars; ++i) {
+ vi1 = raenv->cls_vars[i];
- /* Free the psets held in the variable-infos */
- set_foreach(raenv->vars, vi) {
- del_pset(vi->values);
- del_pset(vi->spills);
- del_pset(vi->reloads);
- }
-}
+ if (vi1->var_nr == SET_REMOVED)
+ continue;
-/******************************************************************************
- _____
- | __ \
- | | | |_ _ _ __ ___ _ __ ___ _ __
- | | | | | | | '_ ` _ \| '_ \ / _ \ '__|
- | |__| | |_| | | | | | | |_) | __/ |
- |_____/ \__,_|_| |_| |_| .__/ \___|_|
- | |
- |_|
- *****************************************************************************/
+ for (o=i+1; o<raenv->n_cls_vars; ++o) {
+ vi2 = raenv->cls_vars[o];
+ if (vi2->var_nr == SET_REMOVED)
+ continue;
-/**
- * Check if node irn has a limited-constraint at position pos.
- * If yes, dump it to FILE raenv->f
- */
-static INLINE void dump_constraint(be_raext_env_t *raenv, ir_node *irn, int pos) {
- bitset_t *bs = bitset_alloca(raenv->cls->n_regs);
- arch_register_req_t req;
+ pset_foreach(vi1->values, irn1)
+ pset_foreach(vi2->values, irn2)
+ if (values_interfere(irn1, irn2)) {
+ pset_break(vi1->values);
+ pset_break(vi2->values);
+ fprintf(f, "(%d, %d)\n", vi1->var_nr, vi2->var_nr);
+ goto NextVar;
+ }
- arch_get_register_req(raenv->aenv, &req, irn, pos);
- if (arch_register_req_is(&req, limited)) {
- int reg_nr;
- req.limited(req.limited_env, bs);
- reg_nr = bitset_next_set(bs, 0);
- fprintf(raenv->f, " <%d>", reg_nr);
- assert(-1 == bitset_next_set(bs, reg_nr+1) && "Constraints with more than 1 possible register are not supported");
+NextVar: ;
+ }
}
+ fprintf(f, "}\n");
}
-
-/**
- * Dump all blocks and instructions in that block
- */
-static void dump_blocks(ir_node *blk, void *env) {
+static void dump_affinities_walker(ir_node *irn, void *env) {
be_raext_env_t *raenv = env;
- ir_node *irn;
- FILE *f = raenv->f;
- int nr = get_irn_node_nr(blk);
+ arch_register_req_t req;
+ int pos, max;
+ var_info_t *vi1, *vi2;
- pmap_insert_sth(raenv->nodes, nr, blk);
+ if (arch_get_irn_reg_class(raenv->aenv, irn, -1) == NULL || arch_irn_is_ignore(raenv->aenv, irn))
+ return;
- /* begin block scope */
- fprintf(f, "\n");
- fprintf(f, " block %d {\n", nr);
+ vi1 = get_var_info(irn);
- /* for each instruction */
- for(irn=sched_first(blk); !sched_is_end(irn); irn=sched_next(irn)) {
- int max, i;
- int node_nr;
+ /* copies have affinities */
+ if (arch_irn_classify(raenv->aenv, irn) == arch_irn_class_copy) {
+ ir_node *other = get_irn_n(irn, be_pos_Copy_orig);
- if (is_Phi(irn) || !is_sth_in_reg_class(raenv, irn))
- continue;
+ if (! arch_irn_is_ignore(raenv->aenv, other)) {
+ vi2 = get_var_info(other);
- /* kind of instruction */
- if (arch_irn_classify(raenv->aenv, irn) == arch_irn_class_copy)
- fprintf(f, " copy");
- else if (arch_irn_classify(raenv->aenv, irn) == arch_irn_class_call)
- fprintf(f, " call");
- else
- fprintf(f, " insn");
-
- /* number */
- node_nr = get_irn_node_nr(irn);
- fprintf(f, " %ld {\n", node_nr);
-
- pmap_insert_sth(raenv->nodes, node_nr, irn);
-
-
- /*
- * print all uses
- */
- fprintf(f, " use");
- for (i=0, max=get_irn_arity(irn); i<max; ++i) {
- ir_node *arg = get_irn_n(irn, i);
- if (arch_irn_has_reg_class(raenv->aenv, arg, -1, raenv->cls)) {
- fprintf(f, " %d", get_var_info(arg)->var_nr);
- dump_constraint(raenv, irn, i);
- }
+ fprintf(raenv->f, "(%d, %d, %d)\n", vi1->var_nr, vi2->var_nr, get_affinity_weight(irn));
}
- fprintf(f,"\n");
-
- /*
- * print all defs
- */
- fprintf(f, " def");
- /* special handling of projs */
- if (get_irn_mode(irn) == mode_T) {
- for (irn = sched_next(irn); is_Proj(irn); irn = sched_next(irn))
- if (arch_irn_has_reg_class(raenv->aenv, irn, -1, raenv->cls)) {
- fprintf(f, " %d", get_var_info(irn)->var_nr);
- dump_constraint(raenv, irn, -1);
- }
- irn = sched_prev(irn); /* for outer loop */
- } else {
- if (arch_irn_has_reg_class(raenv->aenv, irn, -1, raenv->cls)) {
- fprintf(f, " %d", get_var_info(irn)->var_nr);
- dump_constraint(raenv, irn, -1);
- }
- }
- fprintf(f,"\n");
-
- /* end of insn scope */
- fprintf(f, " }\n");
}
- /* end the block scope */
- fprintf(f, " }\n");
-}
-
-/**
- * Dump all control flow edges of this irg
- */
-static void dump_edges(ir_node *blk, void *env) {
- be_raext_env_t *raenv = env;
- int i, max;
+ /* should_be_equal constraints are affinites */
+ for (pos = 0, max = get_irn_arity(irn); pos<max; ++pos) {
+ arch_get_register_req(raenv->aenv, &req, irn, pos);
- if (get_irg_start_block(get_irn_irg(blk)) == blk)
- return;
+ if (arch_register_req_is(&req, should_be_same) && arch_irn_is_ignore(raenv->aenv, req.other_same)) {
+ vi2 = get_var_info(req.other_same);
- /* dump cf edges in the flow-order "pred succ" */
- for (i=0, max=get_irn_arity(blk); i<max; ++i) {
- ir_node *pred = get_Block_cfgpred_block(blk, i);
- fprintf(raenv->f, " cf_edge %ld %ld\n", get_irn_node_nr(pred), get_irn_node_nr(blk));
+ fprintf(raenv->f, "(%d, %d, %d)\n", vi1->var_nr, vi2->var_nr, get_affinity_weight(irn));
+ }
}
}
+static void dump_affinities(be_raext_env_t *raenv) {
+ fprintf(raenv->f, "\naffinities {\n");
+ irg_walk_graph(raenv->irg, NULL, dump_affinities_walker, raenv);
+ fprintf(raenv->f, "}\n");
+}
+
/**
* Dump all information needed by the external
* register allocator to a single file.
*/
static void dump_to_file(be_raext_env_t *raenv, char *filename) {
FILE *f;
- int i, reg_count;
if (!(f = fopen(filename, "wt"))) {
fprintf(stderr, "Could not open file %s for writing\n", filename);
+ assert(0);
exit(0xdeadbeef);
}
raenv->f = f;
/* dump register info */
- reg_count = arch_register_class_n_regs(raenv->cls);
- fprintf(f, "regs %d", reg_count);
-
- fprintf(f, " saved-by-caller");
- for (i=0; i<reg_count; ++i)
- if (arch_register_type_is(arch_register_for_index(raenv->cls, i), caller_saved))
- fprintf(f, " %d", i);
+ fprintf(f, "regs %d\n", arch_register_class_n_regs(raenv->cls));
- fprintf(f, " saved-by-callee");
- for (i=0; i<reg_count; ++i)
- if (arch_register_type_is(arch_register_for_index(raenv->cls, i), callee_saved))
- fprintf(f, " %d", i);
-
- fprintf(f, "\n");
-
- /* dump the cfg */
-
- fprintf(f, "cfg %s {\n", filename);
- irg_block_walk_graph(raenv->irg, NULL, dump_blocks, raenv);
- irg_block_walk_graph(raenv->irg, NULL, dump_edges, raenv);
- fprintf(f, "}\n");
+ /* dump the interference graph */
+ dump_nodes(raenv);
+ dump_interferences(raenv);
+ dump_affinities(raenv);
fclose(f);
}
-
/******************************************************************************
______ _
| ____| | |
char cmd_line[1024];
int ret_status;
- snprintf(cmd_line, sizeof(cmd_line), "%s %s %s", prog_to_call, out_file, result_file);
+ snprintf(cmd_line, sizeof(cmd_line), "%s -i %s -o %s", prog_to_call, out_file, result_file);
ret_status = system(cmd_line);
assert(ret_status != -1 && "Invokation of external register allocator failed");
+ assert(ret_status == 0 && "External register allocator is unhappy with sth.");
+}
+
+/******************************************************************************
+ _ _____ _ _
+ /\ | | | __ \ | | |
+ / \ _ __ _ __ | |_ _ | |__) |___ ___ _ _| | |_
+ / /\ \ | '_ \| '_ \| | | | | | _ // _ \/ __| | | | | __|
+ / ____ \| |_) | |_) | | |_| | | | \ \ __/\__ \ |_| | | |_
+ /_/ \_\ .__/| .__/|_|\__, | |_| \_\___||___/\__,_|_|\__|
+ | | | | __/ |
+ |_| |_| |___/
+ *****************************************************************************/
+
+/**
+ * Spill a variable and add reloads before all uses.
+ */
+static INLINE void var_add_spills_and_reloads(be_raext_env_t *raenv, int var_nr) {
+ var_info_t *vi = var_find(raenv->vars, var_nr);
+ ir_node *spill=NULL, *ctx, *irn;
+ ir_mode *mode;
+ const ir_edge_t *edge, *ne;
+ pset *spills = pset_new_ptr(4); /* the spills of this variable */
+ pset *reloads = pset_new_ptr(4); /* the reloads of this variable */
+ int new_size, n_spills, n_reloads;
+
+ assert(vi && "Variable nr does not exist!");
+ assert(pset_count(vi->values) && "There are no values associated to this variable");
+
+ /* the spill context is set to an arbitrary node of the phi-class,
+ * or the node itself if it is not member of a phi class
+ */
+ if (pset_count(vi->values) == 1)
+ ctx = get_first_non_phi(vi->values);
+ else
+ ctx = get_first_phi(vi->values);
+
+ DBG((raenv->dbg, LEVEL_2, "Spill context: %+F\n", ctx));
+
+ /* for each value of this variable insert the spills */
+ pset_foreach(vi->values, irn) {
+ if (is_Phi(irn)) {
+ sched_remove(irn);
+ continue;
+ }
+
+ /* all ordinary nodes must be spilled */
+ DBG((raenv->dbg, LEVEL_2, " spilling %+F\n", irn));
+ spill = be_spill(raenv->aenv, irn, ctx);
+
+ /* remember the spill */
+ pset_insert_ptr(spills, spill);
+ }
+
+ assert(spill && "There must be at least one non-phi-node");
+
+ mode = get_irn_mode(get_irn_n(spill, be_pos_Spill_val));
+
+ /* insert reloads and wire them arbitrary*/
+ pset_foreach(vi->values, irn)
+ foreach_out_edge_safe(irn, edge, ne) {
+ ir_node *reload, *src = edge->src;
+ if (is_Phi(src) || be_is_Spill(src))
+ continue;
+
+ /* all real uses must be reloaded */
+ DBG((raenv->dbg, LEVEL_2, " reloading before %+F\n", src));
+ reload = be_reload(raenv->aenv, raenv->cls, edge->src, mode, spill);
+ set_irn_n(edge->src, edge->pos, reload);
+
+ /* remember the reload */
+ pset_insert_ptr(reloads, reload);
+ }
+
+ /* correct the reload->spill pointers... */
+ be_ssa_constr_set(raenv->dom_info, spills);
+
+
+ /****** correct the variable <--> values mapping: ******
+ *
+ * - if we had a phi class it gets split into several new variables
+ * - all reloads are new variables
+ */
+ n_spills = pset_count(spills);
+ n_reloads = pset_count(reloads);
+
+ /* first make room for new pointers in the cls_var array */
+ new_size = raenv->n_cls_vars + n_reloads + ((n_spills>1) ? n_spills : 0);
+ raenv->cls_vars = realloc(raenv->cls_vars, (new_size) * sizeof(*raenv->cls_vars));
+ assert(raenv->cls_vars && "Out of mem!?");
+
+ /* if we had a real phi-class, we must... */
+ if (pset_count(spills) > 1) {
+ /* ...remove the old variable corresponding to the phi class */
+ vi->var_nr = SET_REMOVED;
+
+ /* ...add new vars for each non-phi-member */
+ pset_foreach(spills, irn) {
+ ir_node *spilled = get_irn_n(irn, be_pos_Spill_val);
+ raenv->cls_vars[raenv->n_cls_vars++] = var_add_value(raenv, get_irn_node_nr(spilled), spilled);
+ }
+ }
+
+ /* add new variables for all reloads */
+ pset_foreach(reloads, irn) {
+ assert(get_irn_node_nr(irn) != 1089);
+ raenv->cls_vars[raenv->n_cls_vars++] = var_add_value(raenv, get_irn_node_nr(irn), irn);
+ }
+
+ del_pset(spills);
+ del_pset(reloads);
+}
+
+#define INVALID_FILE_FORMAT assert(0 && "Invalid file format.")
+#define BUFLEN 32
+#define BUFCONV " %32s "
+
+/**
+ * Read in the actions performed by the external allocator.
+ * Apply these transformations to the irg.
+ * @return 1 if an allocation was read in. 0 otherwise.
+ */
+static int read_and_apply_results(be_raext_env_t *raenv, char *filename) {
+ FILE *f;
+ char buf[BUFLEN];
+ int is_allocation = 0;
+
+ if (!(f = fopen(filename, "rt"))) {
+ fprintf(stderr, "Could not open file %s for reading\n", filename);
+ assert(0);
+ exit(0xdeadbeef);
+ }
+ raenv->f = f;
+
+ /* read the action */
+ if (fscanf(f, BUFCONV, buf) != 1)
+ INVALID_FILE_FORMAT;
+
+ /* do we spill */
+ if (!strcmp(buf, "spills")) {
+ int var_nr;
+ while (fscanf(f, " %d ", &var_nr) == 1)
+ var_add_spills_and_reloads(raenv, var_nr);
+ } else
+
+ /* or do we allocate */
+ if (!strcmp(buf, "allocs")) {
+ int var_nr, reg_nr;
+
+ is_allocation = 1;
+ while (fscanf(f, " %d %d ", &var_nr, ®_nr) == 2) {
+ ir_node *irn;
+ pset *vals = get_var_values(raenv, var_nr);
+
+ assert(vals && "Variable nr does not exist!");
+ pset_foreach(vals, irn)
+ arch_set_irn_register(raenv->aenv, irn, arch_register_for_index(raenv->cls, reg_nr));
+ }
+ } else
+ INVALID_FILE_FORMAT;
+
+ if (!feof(f))
+ INVALID_FILE_FORMAT;
+
+ fclose(f);
+
+ return is_allocation;
+}
+
+static void check_allocation(be_raext_env_t *raenv) {
+ int i, o;
+
+ for (i=0; i<raenv->n_cls_vars; ++i) {
+ var_info_t *vi1 = raenv->cls_vars[i];
+
+ if (vi1->var_nr == SET_REMOVED)
+ continue;
+
+ for (o=0; o<i; ++o) {
+ var_info_t *vi2 = raenv->cls_vars[o];
+ ir_node *irn1, *irn2;
+
+ if (vi2->var_nr == SET_REMOVED)
+ continue;
+
+ pset_foreach(vi1->values, irn1)
+ pset_foreach(vi2->values, irn2)
+ if (values_interfere(irn1, irn2) && arch_get_irn_register(raenv->aenv, irn1) == arch_get_irn_register(raenv->aenv, irn2)) {
+ dump_ir_block_graph_sched(raenv->irg, "ERROR");
+ ir_fprintf(stdout, "SSA values %+F and %+F interfere. They belong to varible %d and %d respectively.\n", irn1, irn2, vi1->var_nr, vi2->var_nr);
+ assert(0 && "ERROR graph dumped");
+ }
+ }
+ }
}
/******************************************************************************
* Default values for options
*/
static void (*ssa_destr)(be_raext_env_t*) = ssa_destr_simple;
-static char callee[128] = "echo";
+static char callee[128] = "\"E:/user/kimohoff/public/register allocator\"";
+//static char callee[128] = "/ben/kimohoff/ipd-registerallocator/register_allocator";
/**
* Read in results and apply them
*
*/
-static void be_ra_extern_main(const be_main_env_t *env, ir_graph *irg) {
- be_raext_env_t raenv;
+static void be_ra_extern_main(const be_irg_t *bi) {
+ be_main_env_t *env = bi->main_env;
+ ir_graph *irg = bi->irg;
+
+ be_raext_env_t raenv;
int clsnr, clss;
+ var_info_t *vi;
compute_doms(irg);
raenv.aenv = env->arch_env;
raenv.dom_info = be_compute_dominance_frontiers(irg);
raenv.vars = new_set(compare_var_infos, 64);
- raenv.nodes = pmap_create();
- /* SSA destruction */
+ raenv.dbg = firm_dbg_register("ir.be.raextern");
+ firm_dbg_set_mask(raenv.dbg, DBG_LEVEL);
+
+ /* Insert copies for constraints */
+ handle_constraints(&raenv);
+ dump_ir_block_graph_sched(irg, "-extern-constr");
+
+ /* SSA destruction respectively transformation into "Conventional SSA" */
ssa_destr(&raenv);
+ dump_ir_block_graph_sched(irg, "-extern-ssadestr");
- be_clear_links(irg);
+ /* Mapping of SSA-Values <--> Variables */
phi_class_compute(irg);
+ be_clear_links(irg);
irg_walk_graph(irg, values_to_vars, NULL, &raenv);
- dump_ir_block_graph_sched(irg, "-extern-ssadestr");
/* For all register classes */
for(clsnr = 0, clss = arch_isa_get_n_reg_class(raenv.aenv->isa); clsnr < clss; ++clsnr) {
+ int done, round = 1;
char out[256], in[256];
raenv.cls = arch_isa_get_reg_class(raenv.aenv->isa, clsnr);
- ir_snprintf(out, sizeof(out), "%F-%s.ra", irg, raenv.cls->name);
- ir_snprintf(in, sizeof(in), "%F-%s.ra.res", irg, raenv.cls->name);
- dump_to_file(&raenv, out);
+ extract_vars_of_cls(&raenv);
- execute(callee, out, in);
+ do {
+ ir_snprintf(out, sizeof(out), "%F-%s-%d.ra", irg, raenv.cls->name, round);
+ ir_snprintf(in, sizeof(in), "%F-%s-%d.ra.res", irg, raenv.cls->name, round);
- read_and_apply_results(&raenv, in);
+ be_liveness(irg);
+
+ dump_to_file(&raenv, out);
+ execute(callee, out, in);
+ done = read_and_apply_results(&raenv, in);
+
+ ir_snprintf(in, sizeof(in), "-extern-%s-round-%d", raenv.cls->name, round);
+ dump_ir_block_graph_sched(irg, in);
+
+ round++;
+ } while (!done);
+
+ check_allocation(&raenv);
+
+ free(raenv.cls_vars);
}
+ dump_ir_block_graph_sched(irg, "-extern-alloc");
+
/* Clean up */
- pmap_destroy(raenv.nodes);
+ set_foreach(raenv.vars, vi)
+ del_pset(vi->values);
del_set(raenv.vars);
be_free_dominance_frontiers(raenv.dom_info);
-
}
/******************************************************************************
#ifdef WITH_LIBCORE
-static const lc_opt_enum_const_ptr_items_t ssa_destr_items[] = {
- { "simple", ssa_destr_simple },
- { "rastello", ssa_destr_rastello },
+
+static const lc_opt_enum_func_ptr_items_t ssa_destr_items[] = {
+ { "simple", (int (*)()) ssa_destr_simple }, /* TODO make (void*) casts nicer */
+ { "rastello", (int (*)()) ssa_destr_rastello },
{ NULL, NULL }
};
-static lc_opt_enum_const_ptr_var_t ssa_destr_var = {
- (const void **) &ssa_destr, ssa_destr_items
+static lc_opt_enum_func_ptr_var_t ssa_destr_var = {
+ (int (**)()) &ssa_destr, ssa_destr_items
};
static const lc_opt_table_entry_t be_ra_extern_options[] = {
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