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opt.c
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/* $VER: vbcc (opt.c) $Revision: 1.48 $ */
/* allgemeine Routinen fuer den Optimizer und Steuerung der einzelnen */
/* Laeufe */
#include "opt.h"
#include "vbc.h"
static char FILE_[]=__FILE__;
/* die naechsten Funktionen sollten evtl. in ic.c */
/* Sind use/change-Listen initialisiert? */
int have_alias;
int static_cse=1,dref_cse=1;
int no_eff_ics,early_eff_ics;
#ifdef ALEX_REG
extern flowgraph *pFg;
#endif
void insert_IC(IC *p,IC *new)
/* fuegt new hinter p ein; p darf 0 sein */
{
if((new->code==ADDI2P||new->code==SUBIFP||new->code==SUBPFP)&&!ISPOINTER(new->typf2))
ierror(0);
new->prev=p;
if(p){
new->next=p->next; p->next=new;
}else{
new->next=first_ic; first_ic=new;
}
if(new->next)
new->next->prev=new;
else
last_ic=new;
new->q1.am=new->q2.am=new->z.am=0;
}
#ifndef NO_OPTIMIZER
int gchanged; /* Merker, ob Optimierungslauf etwas geaendert hat */
int norek; /* diese Funktion wird nicht rekursiv auf */
int nocall; /* diese Funktion kehrt nicht zum Caller zurueck */
void fix_shortop(flowgraph *fg,IC *p)
{
if((p->typf&NQ)<INT&&!shortcut(p->code,p->typf)){
static type ta;
type *t;
IC *new;
if(DEBUG&1024){puts("fix shortop");pric2(stdout,p);puts("to;");}
ta.flags=int_erw(p->typf);
t=arith_typ(&ta,&ta);
new=new_IC();
new->code=CONVERT;
new->q1=p->q1;
new->z.flags=VAR;
new->z.v=add_tmp_var(clone_typ(t));
new->typf2=p->typf|UNSIGNED;
new->typf=t->flags|UNSIGNED;
p->q1=new->z;
insert_IC_fg(fg,p->prev,new);
new=new_IC();
new->code=CONVERT;
new->q1=p->q2;
new->z.flags=VAR;
new->z.v=add_tmp_var(clone_typ(t));
new->typf2=p->typf|UNSIGNED;
new->typf=t->flags|UNSIGNED;
p->q2=new->z;
insert_IC_fg(fg,p->prev,new);
new=new_IC();
new->code=CONVERT;
new->z=p->z;
new->q1.flags=VAR;
new->q1.v=add_tmp_var(t);
new->typf=p->typf|UNSIGNED;
new->typf2=t->flags|UNSIGNED;
p->z=new->q1;
insert_IC_fg(fg,p,new);
p->typf=t->flags|UNSIGNED;
if(DEBUG&1024){
pric2(stdout,p->prev->prev);
pric2(stdout,p->prev);
pric2(stdout,p);
pric2(stdout,p->next);
}
}
}
#if HAVE_LIBCALLS
extern np gen_libcall(char *fname,np arg1,type *t1,np arg2,type *t2);
/* insert libcalls just before register allocation */
static int insert_libcalls(flowgraph *fg)
{
IC *p,*next,*add;
int replaced=0;
static node n,nl,nr;
static type t,tl,tr;
if(DEBUG&1024) printf("insert_libcalls\n");
while(fg){
for(p=fg->start;p;p=next){
int c=p->code,end=0;
char *libname;
next=p->next;
if((c>=OR&&c<=AND)||(c>=LSHIFT&&c<=KOMPLEMENT)||c==COMPARE||c==CONVERT||c==MINUS||c==TEST){
if(libname=use_libcall(c,p->typf,p->typf2)){
IC *merk_first,*merk_last;
static node n1,n2;
static type t1,t2;
if(DEBUG&1024){
printf("converting IC to libcall:\n");
pric2(stdout,p);
}
#if FIXED_SP
{
/* move nested pushs */
IC *m;flowgraph *g=fg;int fd=0,i;
for(i=0;i<p->arg_cnt;i++){
m=p->arg_list[i];
if(m->code==PUSH){
Var *v;type *t;IC *new;
fd=1;
if(DEBUG&1024){
printf("moving push\n");
pric2(stdout,m);
}
if((m->typf&NQ)==STRUCT) ierror(0);
if((m->typf&NQ)==CHAR&&!zmeqto(m->q2.val.vmax,Z1)) ierror(0);
t=new_typ();
t->flags=m->typf;
v=add_tmp_var(t);
new=new_IC();
new->code=PUSH;
new->q2.val.vmax=m->q2.val.vmax;
new->typf=m->typf;
new->q1.flags=VAR;
new->q1.v=v;
new->q1.val.vmax=Z0;
m->z=new->q1;
m->code=ASSIGN;
insert_IC_fg(g,p,new);
if(DEBUG&1024){
pric2(stdout,m);
pric2(stdout,new);
}
p->arg_list[i]=new;
}
}
}
#endif
replaced=1;
merk_last=last_ic;
merk_first=first_ic;
first_ic=last_ic=0;
n1.flags=REINTERPRET;
n1.o=p->q1;
n1.ntyp=&t1;
t1.flags=q1typ(p);
if(p->q2.flags){
n2.flags=REINTERPRET;
n2.o=p->q2;
n2.ntyp=&t2;
t2.flags=q2typ(p);
gen_libcall(libname,&n1,&t1,&n2,&t2);
}else
gen_libcall(libname,&n1,&t1,0,0);
if(!last_ic||last_ic->code!=GETRETURN) ierror(0);
last_ic->z=p->z;
add=first_ic;
last_ic=merk_last;
first_ic=merk_first;
for(;add;add=next){
next=add->next;
insert_IC_fg(fg,p->prev,add);
}
next=p->next;
if(fg->end==p) end=1;
if(p->z.flags){
remove_IC_fg(fg,p);
}else{
type *t=new_typ();
t->flags=LIBCALL_CMPTYPE;
p->code=COMPARE;
p->q2.flags=KONST;
gval.vmax=Z0;
eval_const(&gval,MAXINT);
insert_const(&p->q2.val,LIBCALL_CMPTYPE);
p->typf=LIBCALL_CMPTYPE;
p->q1.flags=VAR;
p->q1.v=add_tmp_var(t);
p->q1.val.vmax=l2zm(0L);
p->prev->z=p->q1;
p->z.flags=0;
}
}
}
if(end||p==fg->end) break;
}
fg=fg->normalout;
}
return replaced;
}
#endif
/* temporary fuer verschiedene Bitvektoren */
bvtype *tmp;
int in_varlist(varlist *vl,int cnt,Var *v,int flags)
{
int i;
/*FIXME: slow */
for(i=0;i<cnt;i++){
if(vl[i].v==v&&vl[i].flags==flags) return 1;
}
return 0;
}
static void add_call_list(void)
{
IC *p;
for(p=first_ic;p;p=p->next){
if(p->code==CALL&&p->call_cnt==0){
if((p->q1.flags&(VAR|DREFOBJ))==VAR){
p->call_cnt=1;
p->call_list=mymalloc(sizeof(*p->call_list));
p->call_list[0].v=p->q1.v;
p->call_list[0].flags=0;
}
}
}
}
void calc_finfo(Var *v,int flags)
{
IC *p;int i,known,maxtyp,t,c;
/* 128 types should be enough for everyone :-) */
#define TSIZE BVSIZE(128)
static bvtype tf[TSIZE];
if(!v->fi) ierror(0);
if(flags&CALC_USES){
if(v->fi->flags&ALL_USES) return;
free(v->fi->use_list);
v->fi->use_cnt=0;
v->fi->use_list=0;
memset(tf,0,TSIZE);
known=1;maxtyp=-1;
for(p=first_ic;p;p=p->next){
c=p->code;
if(p->q1.flags&DREFOBJ){
t=(q1typ(p)&NQ);
if(t>maxtyp) maxtyp=t;
BSET(tf,t);
}
if(p->q2.flags&DREFOBJ){
t=(q2typ(p)&NQ);
if(t>maxtyp) maxtyp=t;
BSET(tf,t);
}
if(c==CALL){
if((p->q1.flags&(VAR|DREFOBJ))!=VAR||!p->q1.v->fi||!(p->q1.v->fi->flags&ALL_USES)){
free(v->fi->use_list);
v->fi->use_cnt=0;
v->fi->use_list=0;
known=0;
break;
}else{
for(i=0;i<p->q1.v->fi->use_cnt;i++){
if(p->q1.v->fi->use_list[i].v){
if(!in_varlist(v->fi->use_list,v->fi->use_cnt,p->q1.v->fi->use_list[i].v,p->q1.v->fi->use_list[i].flags)){
v->fi->use_cnt++;
v->fi->use_list=myrealloc(v->fi->use_list,v->fi->use_cnt*sizeof(varlist));
v->fi->use_list[v->fi->use_cnt-1]=p->q1.v->fi->use_list[i];
}
}else{
BSET(tf,p->q1.v->fi->use_list[i].flags&NQ);
}
}
}
}else{
for(i=0;i<p->use_cnt;i++){
if(p->use_list[i].v->nesting!=0) continue;
if(!in_varlist(v->fi->use_list,v->fi->use_cnt,p->use_list[i].v,p->use_list[i].flags)){
v->fi->use_cnt++;
v->fi->use_list=myrealloc(v->fi->use_list,v->fi->use_cnt*sizeof(varlist));
v->fi->use_list[v->fi->use_cnt-1]=p->use_list[i];
}
}
}
}
for(c=0;c<=maxtyp;c++){
if(BTST(tf,c)){
v->fi->use_cnt++;
v->fi->use_list=myrealloc(v->fi->use_list,v->fi->use_cnt*sizeof(varlist));
v->fi->use_list[v->fi->use_cnt-1].v=0;
v->fi->use_list[v->fi->use_cnt-1].flags=c;
}
}
if(known) v->fi->flags|=ALL_USES;
}
if(flags&CALC_CHANGES){
if(v->fi->flags&ALL_MODS) return;
free(v->fi->change_list);
v->fi->change_cnt=0;
v->fi->change_list=0;
memset(tf,0,TSIZE);
known=1;maxtyp=-1;
for(p=first_ic;p;p=p->next){
c=p->code;
if(p->z.flags&DREFOBJ){
t=(ztyp(p)&NQ);
if(t>maxtyp) maxtyp=t;
BSET(tf,t);
}
if(c==CALL){
if((p->q1.flags&(VAR|DREFOBJ))!=VAR||!p->q1.v->fi||!(p->q1.v->fi->flags&ALL_MODS)){
free(v->fi->change_list);
v->fi->change_cnt=0;
v->fi->change_list=0;
known=0;
break;
}else{
for(i=0;i<p->q1.v->fi->change_cnt;i++){
if(p->q1.v->fi->change_list[i].v){
if(!in_varlist(v->fi->change_list,v->fi->change_cnt,p->q1.v->fi->change_list[i].v,p->q1.v->fi->change_list[i].flags)){
v->fi->change_cnt++;
v->fi->change_list=myrealloc(v->fi->change_list,v->fi->change_cnt*sizeof(varlist));
v->fi->change_list[v->fi->change_cnt-1]=p->q1.v->fi->change_list[i];
}
}else{
BSET(tf,p->q1.v->fi->change_list[i].flags&NQ);
}
}
}
}else{
for(i=0;i<p->change_cnt;i++){
if(p->change_list[i].v->nesting!=0) continue;
if(!in_varlist(v->fi->change_list,v->fi->change_cnt,p->change_list[i].v,p->change_list[i].flags)){
v->fi->change_cnt++;
v->fi->change_list=myrealloc(v->fi->change_list,v->fi->change_cnt*sizeof(varlist));
v->fi->change_list[v->fi->change_cnt-1]=p->change_list[i];
}
}
}
}
for(c=0;c<=maxtyp;c++){
if(BTST(tf,c)){
v->fi->change_cnt++;
v->fi->change_list=myrealloc(v->fi->change_list,v->fi->change_cnt*sizeof(varlist));
v->fi->change_list[v->fi->change_cnt-1].v=0;
v->fi->change_list[v->fi->change_cnt-1].flags=c;
}
}
if(known) v->fi->flags|=ALL_MODS;
}
if(flags&CALC_CALLS){
if(v->fi->flags&ALL_CALLS) return;
free(v->fi->call_list);
v->fi->call_list=0;
v->fi->call_cnt=0;
p=v->fi->opt_ic;
if(!p)
p=v->fi->first_ic;
for(;p;p=p->next){
if(p->code==CALL){
if(p->q1.flags&DREFOBJ) return;
if(!in_varlist(v->fi->call_list,v->fi->call_cnt,p->q1.v,0)){
v->fi->call_cnt++;
v->fi->call_list=myrealloc(v->fi->call_list,v->fi->call_cnt*sizeof(varlist));
v->fi->call_list[v->fi->call_cnt-1].v=p->q1.v;
v->fi->call_list[v->fi->call_cnt-1].flags=0;
}
}
}
v->fi->flags|=ALL_CALLS;
}
}
void used_clist(type *t,const_list *cl)
{
int i;zmax l;
if(ISARRAY(t->flags)){
for(l=l2zm(0L);!zmleq(t->size,l)&&cl;l=zmadd(l,l2zm(1L)),cl=cl->next){
if(!cl->other){ierror(0);return;}
used_clist(t->next,cl->other);
}
return;
}
if(ISUNION(t->flags)&&!cl->tree){
used_clist((*t->exact->sl)[zm2l(cl->idx)].styp,cl->other);
return;
}
if(ISSTRUCT(t->flags)){
type *st;
for(i=0;i<t->exact->count&&cl;i++){
st=(*t->exact->sl)[i].styp;
if(!(*t->exact->sl)[i].identifier) ierror(0);
if((*t->exact->sl)[i].identifier[0]){
if(cl->other) used_clist(st,cl->other);
cl=cl->next;
}
}
return;
}
if(cl->tree&&(cl->tree->o.flags&VAR))
used_objects(cl->tree->o.v);
return;
}
void used_objects(Var *v)
{
int i;
if(v->flags&REFERENCED) return;
v->flags|=REFERENCED;
if(ISFUNC(v->vtyp->flags)){
IC *p;
if(!(v->flags&DEFINED)) return;
if(!v->fi) ierror(0);
for(i=0;i<v->fi->call_cnt;i++){
if(v->fi->call_list[i].v->flags&DEFINED)
used_objects(v->fi->call_list[i].v);
}
/*FIXME: use/change aus fi */
for(p=v->fi->opt_ic;p;p=p->next){
if(p->q1.flags&VAR) used_objects(p->q1.v);
if(p->q2.flags&VAR) used_objects(p->q2.v);
if(p->z.flags&VAR) used_objects(p->z.v);
}
}else{
if(v->clist) used_clist(v->vtyp,v->clist);
}
}
zmax recalc_start_offset;
static void mark_na(bvtype *tmp,int r,int *eqto)
{
int i;
if(r<0||r>=vcount-rcount||BTST(tmp,r)) return;
/*if(DEBUG&1024) printf("mark_na %s(%p):\n",vilist[r]->identifier,(void*)vilist[r]);*/
BSET(tmp,r);
for(i=0;i<vcount-rcount;i++){
if(eqto[i]!=r&&eqto[r]!=i) continue;
/*if((DEBUG&1024)&&!BTST(tmp,i)) printf(" mark_na %s(%p)\n",vilist[i]->identifier,(void*)vilist[i]);*/
mark_na(tmp,i,eqto);
}
}
/* TODO: remove ugly hack by decent exit criteria */
static int reccheck_maxcnt;
/* check if function v can not call callee */
static int check_nonrecursive(Var *v,Var *callee)
{
int i;
Var *f;
if(--reccheck_maxcnt==0) return 0;
if(v->fi&&(v->fi->flags&ALL_CALLS)){
for(i=0;i<v->fi->call_cnt;i++){
f=v->fi->call_list[i].v;
if(f==v)
return 0;
if(!check_nonrecursive(f,callee))
return 0;
}
return 1;
}
return 0;
}
static void cnv_static(Var *v)
{
if((v->storage_class==AUTO||v->storage_class==REGISTER)&&zmleq(Z0,v->offset)&&v->reg==0/*&&!(v->flags&CONVPARAMETER)*/){
v->storage_class=STATIC;
v->offset=++label;
v->flags|=(USEDASSOURCE|USEDASDEST|DEFINED|STATICAUTO);
if(v->clist){free_clist(v->clist);v->clist=0;}
if(DEBUG&1024) printf("changing %s(%p) to static (L%ld)\n",v->identifier,v,zm2l(v->offset));
}
}
/* replace auto variables by statics if possible */
void replace_statics(Var *v)
{
IC *p;
if(DEBUG&1024) printf("replace_statics()\n");
if(force_statics||(v->fi&&(v->fi->flags&ALL_CALLS))){
if(!force_statics){
reccheck_maxcnt=100;
if(!check_nonrecursive(v,v))
return;
if(DEBUG&1024) printf("non-recursive\n");
}
for(p=first_ic;p;p=p->next){
if((p->q1.flags&(VAR|REG))==VAR) cnv_static(p->q1.v);
if((p->q2.flags&(VAR|REG))==VAR) cnv_static(p->q2.v);
if((p->z.flags&(VAR|REG))==VAR) cnv_static(p->z.v);
if(p->code==ADDRESS&&p->q1.v->storage_class==STATIC){
p->code=ASSIGN;
p->q1.flags|=VARADR;
p->q2.val.vmax=sizetab[p->typf2&NQ];
p->typf=p->typf2;
}
}
}
}
void recalc_offsets(flowgraph *g)
/* berechnet Offsets fuer auto-Variablen neu und versucht, fuer Variablen, */
/* die nicht gleichzeitig aktiv sind, den gleichen Platz zu belegen */
{
int i,j,b,bcnt,r,*eqto,pass;size_t bsize,vsize;zmax *al,*sz;
bvtype **used,*tmp,*empty,*vtmp,*vpos;
IC *p;
flowgraph *fg;
if(DEBUG&1024) printf("recalculating offsets\n");
if(DEBUG&1024) printf("setting up arrays\n");
/*bsize=(basic_blocks+CHAR_BIT-1)/CHAR_BIT; /* we don's use fg->index but count from 0 */
bsize=BVSIZE(basic_blocks);
if(DEBUG&1024) printf("bsize=%lu\n",(unsigned long)bsize);
tmp=mymalloc(bsize);
al=mymalloc(sizeof(*al)*(vcount-rcount));
eqto=mymalloc(sizeof(int)*(vcount-rcount));
sz=mymalloc(sizeof(*sz)*(vcount-rcount));
empty=mymalloc(bsize);
memset(empty,0,bsize);
used=mymalloc(sizeof(bvtype *)*(vcount-rcount));
/* Tabelle, welche Variable in welchem Block belegt ist, aufbauen */
for(i=0;i<vcount-rcount;i++){
if((vilist[i]->storage_class==AUTO||vilist[i]->storage_class==REGISTER)&&zmleq(l2zm(0L),vilist[i]->offset)){
if(DEBUG&2048) printf("setting up for %s,%ld\n",vilist[i]->identifier,zm2l(vilist[i]->offset));
used[i]=mymalloc(bsize);
memset(used[i],0,bsize);
}else{
used[i]=0;
}
sz[i]=szof(vilist[i]->vtyp);
al[i]=falign(vilist[i]->vtyp);
eqto[i]=-1;
}
b=0; fg=g;
while(fg){
if(b>=basic_blocks) ierror(0);
for(i=0;i<vcount-rcount;i++){
if(used[i]&&(BTST(fg->av_in,i)||BTST(fg->av_out,i))){
BSET(used[i],b);
for(r=1;r<=MAXR;r++)
if(fg->regv[r]&&fg->regv[r]->index==i) BCLR(used[i],b);
}
}
for(p=fg->start;p;p=p->next){
if((p->q1.flags&(VAR|REG))==VAR){
i=p->q1.v->index;
if(i!=-1&&i<vcount-rcount){
if(i<0||i>=vcount) ierror(0);
if(i>=0&&used[i]){
BSET(used[i],b);
}
}
}
if((p->q2.flags&(VAR|REG))==VAR){
i=p->q2.v->index;
if(i!=-1&&i<vcount-rcount){
if(i<0||i>=vcount) ierror(0);
if(i>=0&&used[i]){
BSET(used[i],b);
}
}
}
if((p->z.flags&(VAR|REG))==VAR){
i=p->z.v->index;
if(i!=-1){
if(i<0||i>=vcount) ierror(0);
if(i>=0&&used[i]){
BSET(used[i],b);
}
}
}
if(p==fg->end) break;
}
fg=fg->normalout;
b++;
}
bcnt=b;
if(DEBUG&1024) printf("local recalc\n");
vsize=BVSIZE(vcount-rcount);
vtmp=mymalloc(vsize);
vpos=mymalloc(vsize);
j=0;
for(fg=g;fg;fg=fg->normalout){
bvcopy(vtmp,fg->av_in,vsize);
bvunite(vtmp,fg->av_out,vsize);
for(r=1;r<=MAXR;r++)
if(fg->regv[r]&&fg->regv[r]->index<vcount-rcount) BSET(vtmp,fg->regv[r]->index);
for(i=0;i<vcount-rcount;i++){
if(!BTST(vtmp,i)){
if(!used[i]||!BTST(used[i],j)||(vilist[i]->storage_class!=AUTO&&vilist[i]->storage_class!=REGISTER))
BSET(vtmp,i);
else{
for(r=0;r<bcnt;r++)
if(r!=j&&BTST(used[i],r))
BSET(vtmp,i);
}
}
}
#if 1
if(DEBUG&1024){
printf("possible for local recalc block %d (%d):\n",j,fg->index);
for(i=0;i<vcount-rcount;i++)
if(!BTST(vtmp,i))
printf(" %s(%p)\n",vilist[i]->identifier,(void*)vilist[i]);
}
#endif
for(p=fg->start;p;p=p->next){
if((p->z.flags&(VAR|DREFOBJ))==VAR){
b=p->z.v->index;
if(b>=0&&b<vcount-rcount&&eqto[b]<0&&!BTST(vtmp,b)){
/* imprecise, but should do the job */
IC *m;
/*if(DEBUG&1024) printf("checking %s(%p)\n",vilist[b]->identifier,(void*)vilist[b]);*/
bvcopy(vpos,vtmp,vsize);
for(m=p->next;m;m=m->next){
if(m->q1.flags&VAR) mark_na(vpos,m->q1.v->index,eqto);
if(m->q2.flags&VAR) mark_na(vpos,m->q2.v->index,eqto);
if(m->z.flags&VAR){
mark_na(vpos,m->z.v->index,eqto);
if(m->z.v->index==b) BSET(vtmp,b);
}
if(m==fg->end) break;
}
for(i=vcount-rcount-1;i>=0;i--){
if(!BTST(vpos,i)&&i!=b){
if(DEBUG&1024) printf("local memory for %s(%p) and %s(%p) equal",vilist[i]->identifier,(void *)vilist[i],vilist[b]->identifier,(void *)vilist[b]);
eqto[b]=i;
if(!zmleq(al[b],al[i])) al[i]=al[b];
if(!zmleq(sz[b],sz[i])) sz[i]=sz[b];
if(!zmleq(al[i],al[b])) al[b]=al[i];
if(!zmleq(sz[i],sz[b])) sz[b]=sz[i];
if(DEBUG&1024) printf(" sz=%ld al=%ld\n",(long)zm2l(al[i]),(long)zm2l(sz[i]));
BSET(vtmp,i);
/*bvunite(used[i],used[b],bsize);*/
break;
}
}
}
}
if(p==fg->end) break;
}
j++;
}
free(vtmp);
free(vpos);
/* schauen, ob Variablen in gleichen Speicher koennen */
if(DEBUG&1024) printf("looking for distinct variables\n");
for(i=0;i<vcount-rcount;i++){
if(!used[i]||eqto[i]>=0) continue;
if(!memcmp(used[i],empty,bsize)){ free(used[i]);used[i]=0;continue;}
for(b=i+1;b<vcount-rcount;b++){
if(!used[b]||eqto[b]>=0) continue;
if(!memcmp(used[b],empty,bsize)){ free(used[b]);used[b]=0;continue;}
if(DEBUG&2048) printf("comparing %s(%p) and %s(%p)\n",vilist[i]->identifier,(void *)vilist[i],vilist[b]->identifier,(void *)vilist[b]);
memcpy(tmp,used[i],bsize);
bvintersect(tmp,used[b],bsize);
if(!memcmp(tmp,empty,bsize)){
if(DEBUG&1024) printf("memory for %s(%p) and %s(%p) equal\n",vilist[i]->identifier,(void *)vilist[i],vilist[b]->identifier,(void *)vilist[b]);
eqto[b]=i;
if(!zmleq(al[b],al[i])) al[i]=al[b];
if(!zmleq(sz[b],sz[i])) sz[i]=sz[b];
if(!zmleq(al[i],al[b])) al[b]=al[i];
if(!zmleq(sz[i],sz[b])) sz[b]=sz[i];
bvunite(used[i],used[b],bsize);
}
}
}
if(DEBUG&1024) printf("propagating sz/al\n");
do{
if(DEBUG&1024) printf("ppass\n");
b=0;
for(i=0;i<vcount-rcount;i++){
j=i;
while((j=eqto[j])>=0){
if(!zmleq(sz[j],sz[i])){sz[i]=sz[j];b=1;j=i;if(DEBUG&1024) printf("lmset %d(%p) to sz %ld\n",i,vilist[i],zm2l(sz[i]));}
if(!zmleq(sz[i],sz[j])){sz[j]=sz[i];b=1;if(DEBUG&1024) printf("lmset %d(%p) to sz %ld\n",j,vilist[j],zm2l(sz[j]));}
if(!zmleq(al[j],al[i])){al[i]=al[j];b=1;j=i;if(DEBUG&1024) printf("lmset %d(%p) to al %ld\n",i,vilist[i],zm2l(al[i]));}
if(!zmleq(al[i],al[j])){al[j]=al[i];b=1;if(DEBUG&1024) printf("lmset %d(%p) to al %ld\n",j,vilist[j],zm2l(al[j]));}
}
}
}while(b);
if(DEBUG&1024) printf("final recalculating\n");
max_offset=recalc_start_offset;
for(pass=0;pass<3;pass++){
zmax a;
for(a=maxalign;!zmeqto(a,Z0);a=zmsub(a,Z1)){
for(i=0;i<vcount-rcount;i++){
if(!used[i]) continue;
if(!zmeqto(a,al[i])) continue;
if(eqto[i]>=0&&pass<2) continue;
if(pass==0){
if(!zmleq(sz[i],sizetab[MAXINT])&&!zmleq(sz[i],sizetab[LDOUBLE])) continue;
}
free(used[i]);
used[i]=0;
if(DEBUG&2048) printf("adjusting offset for %s,%ld(%p)\n",vilist[i]->identifier,zm2l(vilist[i]->offset),(void*)vilist[i]);
if(eqto[i]>=0){
j=eqto[i];
do{
}while(used[j]&&(j=eqto[j])>=0);
if(j<0) ierror(0);
if(!zmleq(sz[i],sz[j]))
{printf("%d(%p) %d(%p) %ld %ld\n",i,vilist[i],j,vilist[j],zm2l(sz[i]),zm2l(sz[j]));ierror(0);}
if(!zmleq(al[i],al[j]))
{printf("%d(%p) %d(%p) %ld %ld\n",i,vilist[i],j,vilist[j],zm2l(al[i]),zm2l(al[j]));ierror(0);}
vilist[i]->offset=vilist[j]->offset;
if(DEBUG&2048) printf("set to %ld (eqto)\n",(long)zm2l(vilist[i]->offset));
continue;
}
vilist[i]->offset=zmmult(zmdiv(zmadd(max_offset,zmsub(al[i],l2zm(1L))),al[i]),al[i]);
max_offset=zmadd(vilist[i]->offset,sz[i]);
if(DEBUG&2048) printf("set to %ld (std)\n",(long)zm2l(vilist[i]->offset));
}
}
}
recalc_start_offset=l2zm(0L);
free(used);
free(sz);
free(al);
free(tmp);
free(empty);
free(eqto);
}
void remove_IC_fg(flowgraph *g,IC *p)
/* Entfernt IC p und beachtet Flussgraph. Ausserdem werden */
/* use/change-Listen freigegeben. */
{
if(p->q1.am||p->q2.am||p->z.am) ierror(0);
if(have_alias){
free(p->use_list);
free(p->change_list);
}
if(g->start==g->end){
g->start=g->end=0;
}else{
if(p==g->end) g->end=p->prev;
if(p==g->start) g->start=p->next;
}
remove_IC(p);
}
/* function to decide whether a possible const memcpy shall
be implemented using typ t; if noptr is non-zero decide
if not introducing a pointer is preferable */
int decide_const_memcpy(IC *p,int typ,int noptr)
{
zmax cnt;
/* usually int is the most efficient */
if(typ==CHAR){
}else if(typ==BESTCOPYT){
if((p->z.flags&(VAR|DREFOBJ))!=VAR)
return 0;
if(!zmleq(align[typ],falign(p->z.v->vtyp)))
return 0;
if(!zmeqto(zmmod(p->z.val.vmax,align[typ]),Z0))
return 0;
}else
return 0;
cnt=zmdiv(p->q2.val.vmax,sizetab[typ]);
if((p->z.flags&(DREFOBJ|KONST))!=DREFOBJ){
int sc;
if(p->z.flags&DREFOBJ)
sc=STATIC;
else
sc=p->z.v->storage_class;
if(sc==AUTO||sc==REGISTER){
/* we assume that writes on the stack can be combined */
if(typ==CHAR&&noptr)
if(zmleq(cnt,zmmult(clist_copy_pointer,sizetab[BESTCOPYT])))
return 1;
if(zmleq(cnt,l2zm(clist_copy_stack)))
return 1;
}else{
if(zmleq(cnt,l2zm(clist_copy_static)))
return 1;
}
}
if(noptr==0&&zmleq(cnt,l2zm(clist_copy_pointer)))
return 1;
return 0;
}
int insert_const_memcpy(flowgraph *fg)
{
int changed =0;
flowgraph *g;
for(g=fg;g;g=g->normalout){
IC *p;
for(p=g->start;p;p=p->next){
int c=p->code;
/* TODO: finish support for PUSH */
if((c==ASSIGN/*||c==PUSH*/)&&(p->q1.flags&(VAR|VARADR|DREFOBJ))==VAR&&p->q1.v->clist&&is_const(p->q1.v->vtyp)){
zmax i,sz=p->q2.val.vmax;
zuchar zuc;
Var *v=p->q1.v;
type *t=v->vtyp;
int ok=1;
for(i=Z0;zmleq(i,sz);i=zmadd(i,Z1)){
if(!get_clist_byte(t,v->clist,i,&zuc))
ok=0;
}
if(ok==1){
int typ=0,noptr=1;
int a1,a2;
if(DEBUG&1024) {printf("can replace const memcpy:\n");pric2(stdout,p);}
if(c==ASSIGN&&(p->z.flags&(DREFOBJ|KONST))!=DREFOBJ){
if(decide_const_memcpy(p,BESTCOPYT,noptr))
typ=BESTCOPYT;
else if(decide_const_memcpy(p,CHAR,noptr))
typ=CHAR;
}
if(typ==0){
noptr=0;
if(decide_const_memcpy(p,BESTCOPYT,noptr))
typ=BESTCOPYT;
else if(decide_const_memcpy(p,CHAR,noptr))
typ=CHAR;
}
if(typ){
Var *ptr;
IC *new;
if(DEBUG&1024) printf("will do it (typ=%d noptr=%d)\n",typ,noptr);
if(!noptr){
type *pt;
if(p->z.flags&VAR){
if(p->z.flags&DREFOBJ){
type *new=new_typ();
new->flags=p->z.dtyp&NQ;
new->next=new_typ();
new->next->flags=typ;
pt=new;
}else{
pt=new_typ();
pt->flags=POINTER_TYPE(p->z.v->vtyp);
pt->next=clone_typ(p->z.v->vtyp);
}
}else{
static type ct={CHAR};
type *new;
ct.flags=typ;
new=new_typ();
new->flags=POINTER_TYPE(&ct);
new->next=new_typ();
new->next->flags=typ;
pt=new;
}
ptr=add_tmp_var(pt);
new=new_IC();
new->z.flags=VAR;
new->z.v=ptr;
new->q1=p->z;
if(p->z.flags&DREFOBJ){
new->code=ASSIGN;
new->q1.flags&=~DREFOBJ;
new->typf=ptr->vtyp->flags;
}else if(p->z.v->storage_class==STATIC||p->z.v->storage_class==EXTERN){
new->code=ASSIGN;
new->q1.flags|=VARADR;
new->typf=ptr->vtyp->flags;
}else if(p->z.v->storage_class==AUTO||p->z.v->storage_class==REGISTER){
new->code=ADDRESS;
new->typf=p->z.v->vtyp->flags;
new->typf2=ptr->vtyp->flags;
}else
ierror(0);
new->q2.val.vmax=sizetab[new->typf];
insert_IC_fg(g,p->prev,new);
}
i=Z0;
while(!zmleq(sz,i)){
/* use CHAR for possibly remaining bytes */
if(!zmleq(zmadd(sizetab[typ],i),sz))
typ=CHAR;
new=new_IC();
new->code=p->code;
new->typf=typ;
new->q1.flags=KONST;
if(typ==CHAR){
if(!get_clist_byte(t,v->clist,zmadd(i,p->q1.val.vmax),&zuc))
ierror(0);
new->q1.val.vuchar=zuc;
}else{
int state;
gval.vmax=get_clist_int(t,v->clist,zmadd(i,p->q1.val.vmax),zm2l(sizetab[typ]),&state);
if(!state) ierror(0);
eval_const(&gval,MAXINT);
insert_const(&new->q1.val,typ);
}
new->q2.val.vmax=sizetab[new->typf];
if(new->code==ASSIGN){
if(noptr){
new->z=p->z;
new->z.val.vmax=zmadd(new->z.val.vmax,i);
}else{
new->z.flags=VAR|DREFOBJ;
new->z.v=ptr;
new->z.dtyp=ptr->vtyp->flags;
}
}else
ierror(0); /* TODO: PUSH */
insert_IC_fg(g,p->prev,new);
if(!noptr){
new=new_IC();
new->code=ADDI2P;
new->q1.flags=VAR;
new->q1.v=ptr;
new->z=new->q1;
new->q2.flags=KONST;
new->q2.val.vint=zm2zi(sizetab[typ]);
new->typf=INT;
new->typf2=ptr->vtyp->flags;
insert_IC_fg(g,p->prev,new);
}
i=zmadd(i,sizetab[typ]);
}
remove_IC_fg(g,p);
p=new;
changed=1;
}
}
}
if(p==g->end) break;
}
}
return changed;
}
/* combines assignments of constants into a larger type */
void combine_const_assigns(void)
{
static int ctype[BESTCOPYT],i,j;
IC *p=first_ic;
/* calculate table of combine types */
for(i=CHAR;i<BESTCOPYT;i++){
ctype[i]=0;
for(j=BESTCOPYT;j>CHAR;j--){
if(zmeqto(sizetab[j],zmadd(sizetab[i],sizetab[i]))){
if(DEBUG&1024) printf("possible combine type %s=>%s\n",typname[i],typname[j]);
ctype[i]=j;
break;
}
}
}
while(p){
if(p->code==ASSIGN&&(p->q1.flags&(KONST|DREFOBJ))==KONST&&(p->z.flags&(DREFOBJ|VAR))==VAR){
IC *p2=p->next;
if(p2&&p2->code==ASSIGN&&(p2->q1.flags&(KONST|DREFOBJ))==KONST&&(p2->z.flags&(DREFOBJ|VAR))==VAR&&p->z.v==p2->z.v&&p->typf==p2->typf&&zmeqto(p->q2.val.vmax,p2->q2.val.vmax)&&zmeqto(p2->z.val.vmax,zmadd(p->z.val.vmax,sizetab[p->typf&NQ]))){
int dt,t=p->typf&NQ,sc=p->z.v->storage_class;
if(t<BESTCOPYT&&(dt=ctype[t])){
zmax os;
/* for stack variables we can use the actual offset, for statics
we rely on the type alignment */
if(sc==AUTO||sc==REGISTER)
os=zmadd(p->z.v->offset,p->z.val.vmax);
else{
if(zmeqto(zmmod(falign(p->z.v->vtyp),align[dt]),Z0))
os=p->z.val.vmax;
else
os=Z1;
}
if(zmeqto(zmmod(os,align[dt]),Z0)){
zumax v1,v2;