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opt.c
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opt.c
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/* $VER: vbcc (opt.c) V0.8 */
/* allgemeine Routinen fuer den Optimizer und Steuerung der einzelnen */
/* Laeufe */
#include "opt.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;
#ifdef ALEX_REG
extern struct flowgraph *pFg;
#endif
void insert_IC(struct IC *p,struct 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 */
#if HAVE_LIBCALLS
extern np gen_libcall(char *fname,np arg1,struct Typ *t1,np arg2,struct Typ *t2);
/* insert libcalls just before register allocation */
static int insert_libcalls(struct flowgraph *fg)
{
struct IC *p,*next,*add;
int replaced=0;
static struct node n,nl,nr;
static struct Typ 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<=XOR)||(c>=LSHIFT&&c<=KOMPLEMENT)||c==COMPARE||c==CONVERT||c==MINUS||c==TEST){
if(libname=use_libcall(c,p->typf,p->typf2)){
struct IC *merk_first,*merk_last;
static struct node n1,n2;
static struct Typ t1,t2;
if(DEBUG&1024){
printf("converting IC to libcall:\n");
pric2(stdout,p);
}
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{
struct Typ *t=new_typ();
t->flags=INT;
p->code=TEST;
p->typf=INT;
p->q1.flags=VAR;
p->q1.v=add_tmp_var(t);
p->q1.val.vmax=l2zm(0L);
p->prev->z=p->q1;
p->q2.flags=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(struct varlist *vl,int cnt,struct 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)
{
struct 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(struct Var *v,int flags)
{
struct 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(struct 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(struct 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(struct 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(struct 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(struct 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(struct 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(struct 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(struct Typ *t,struct 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)){
used_clist((*t->exact->sl)[0].styp,cl);
return;
}
if(ISSTRUCT(t->flags)){
struct Typ *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(struct Var *v)
{
int i;
if(v->flags&REFERENCED) return;
v->flags|=REFERENCED;
if(ISFUNC(v->vtyp->flags)){
struct 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;
void recalc_offsets(struct flowgraph *fg)
/* berechnet Offsets fuer auto-Variablen neu und versucht, fuer Variablen, */
/* die nicht gleichzeitig aktiv sind, den gleichen Platz zu belegen */
{
int i,b,*eqto;size_t bsize;zmax *al,*sz;
bvtype **used,*tmp,*empty;
struct IC *p;
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(zmleq(l2zm(0L),vilist[i]->offset)&&(vilist[i]->storage_class==AUTO||vilist[i]->storage_class==REGISTER)){
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;
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))){
int r;
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){
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){
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++;
}
/* 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];
bvunite(used[i],used[b],bsize);
}
}
}
if(DEBUG&1024) printf("final recalculating\n");
max_offset=recalc_start_offset;
for(i=0;i<vcount-rcount;i++){
if(!used[i]) continue;
free(used[i]);
if(DEBUG&2048) printf("adjusting offset for %s,%ld\n",vilist[i]->identifier,zm2l(vilist[i]->offset));
if(eqto[i]>=0){
vilist[i]->offset=vilist[eqto[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]);
}
recalc_start_offset=l2zm(0L);
free(used);
free(sz);
free(al);
free(tmp);
free(empty);
free(eqto);
}
void remove_IC_fg(struct flowgraph *g,struct 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);
}
/* allowed to create new variables */
int early_peephole(void)
{
struct IC *p;
int changed,gchanged=0,c,t;
do{
changed=0;
p=first_ic;
while(p){
c=p->code;
t=p->typf;
if(c==COMPARE&&(p->q2.flags&KONST)&&ISINT(p->typf)){
struct case_table *ct;
if((ct=calc_case_table(p,JUMP_TABLE_DENSITY))&&ct->num>1&&ct->density==1){
int i;
for(i=0;i<ct->num;i++){
if(ct->labels[i]!=ct->labels[0])
break;
}
if(i>=ct->num){
struct IC *new;
static struct Typ ityp;
if(DEBUG&1024) printf("converting cases to range-check\n");
if(multiple_ccs) ierror(0);
new=new_IC();
new->code=SUB;
new->typf=ct->typf;
new->q1=p->q1;
new->q2.flags=KONST;
if(ct->typf&UNSIGNED)
eval_const(&ct->min,UNSIGNED|MAXINT);
else
eval_const(&ct->min,MAXINT);
insert_const(&new->q2.val,ct->typf);
new->z.flags=VAR;
ityp.flags=ct->typf;
new->z.v=add_tmp_var(clone_typ(&ityp));
new->z.val.vmax=l2zm(0L);
insert_IC(p->prev,new);
new=new_IC();
new->code=COMPARE;
new->q1=p->prev->z;
new->z.flags=0;
new->q2.flags=KONST;
new->typf=(ct->typf|UNSIGNED);
gval.vumax=ct->diff;
eval_const(&gval,UNSIGNED|MAXINT);
insert_const(&new->q2.val,new->typf);
insert_IC(p->prev,new);
new=new_IC();
new->code=BLE;
new->typf=ct->labels[0];
insert_IC(p->prev,new);
while(p!=ct->next_ic){
struct IC *m=p->next;
remove_IC(p);
p=m;
}
changed=1;
continue;
}
}
}
p=p->next;
}
gchanged|=changed;
}while(changed);
return gchanged;
}
int peephole()
/* macht alle moeglichen Vereinfachungen/Vereinheitlichungen */
{
struct IC *p;struct obj o;int t,c,null,eins,changed,done=0;
function_calls=0;
do{
if(DEBUG&1024) printf("searching for peephole optimizations\n");
changed=0;ic_count=0;
p=first_ic;
while(p){
c=p->code;
t=p->typf;
if(c==NOP&&!p->q1.flags&&!p->q2.flags&&!p->z.flags){
struct IC *m;
if(DEBUG&1024) printf("removing nop\n");
m=p;p=p->next;
remove_IC(m);
continue;
}
ic_count++;
if(c==LABEL&&report_suspicious_loops&&p->next&&p->next->code==BRA&&p->next->typf==t){
error(208);report_suspicious_loops=0;
}
if(c==COMPARE&&(p->q2.flags&(KONST|DREFOBJ))==KONST){
eval_const(&p->q2.val,t);
if(ISINT(t)&&zmeqto(vmax,l2zm(1L))&&zumeqto(vumax,ul2zum(1UL))){
struct IC *p2=p->next;
if(p2->code==BGE){
vmax=l2zm(0L);insert_const(&gval,MAXINT);
p->q2.val=gval;p2->code=BGT;changed=1;
if(DEBUG&1024) printf("cmp #1 replaced by cmp #0(1)\n");
}else if(p2->code==BLT){
vmax=l2zm(0L);insert_const(&gval,MAXINT);
p->q2.val=gval;p2->code=BLE;changed=1;
if(DEBUG&1024) printf("cmp #1 replaced by cmp #0(2)\n");
}
}else if(ISINT(t)&&!(t&UNSIGNED)&&zmeqto(vmax,l2zm(-1L))){
struct IC *p2=p->next;
if(p2->code==BGT){
vmax=l2zm(0L);insert_const(&gval,MAXINT);
p->q2.val=gval;p2->code=BGE;changed=1;
if(DEBUG&1024) printf("cmp #-1 replaced by cmp #0(1)\n");
}else if(p2->code==BLE){
vmax=l2zm(0L);insert_const(&gval,MAXINT);
p->q2.val=gval;p2->code=BLT;changed=1;
if(DEBUG&1024) printf("cmp #-1 replaced by cmp #0\n(2)");
}
}
}
if(c>=BEQ&&c<BRA&&p->next&&p->next->code==BRA&&p->typf==p->next->typf){
struct IC *p2,*m;
if(DEBUG&1024){
printf("removing bcc followed by bra\n");
pric2(stdout,p);
}
m=p->next;
p2=p->prev;
remove_IC(p);
if(p2&&(p2->code==TEST||p2->code==COMPARE)&&p2->z.flags==0){
if(DEBUG&1024){
printf("removing comparison:\n");
pric2(stdout,p2);
}
remove_IC(p2);
}
p=m;
changed=1;
continue;
}
if(c==CALL) function_calls++;
if((p->q1.flags&(KONST|DREFOBJ))==KONST){
if(((p->q2.flags&(KONST|DREFOBJ))==KONST)||!p->q2.flags){
struct IC *old=p->prev;
if(fold(p)){ changed=1; p=old;continue;}
p=p->next;continue;
}else{
if(c==ADD||c==MULT||(c>=OR&&c<=AND)||(c==COMPARE&&!(p->z.flags)&&p->next&&p->next->code>=BEQ&&p->next->code<BRA)){ /* const nach rechts */
if(DEBUG&1024){ printf("swapped commutative op:\n");pric2(stdout,p);}
o=p->q1;p->q1=p->q2;p->q2=o;
if(c==COMPARE){
struct IC *br=p->next;
if(br->code==BLT) br->code=BGT;
else if(br->code==BLE) br->code=BGE;
else if(br->code==BGT) br->code=BLT;
else if(br->code==BGE) br->code=BLE;
}
}
}
}
if((p->q2.flags&(KONST|DREFOBJ))==KONST){
/* algebraische Optimierungen */
eval_const(&p->q2.val,q2typ(p));
if(zmeqto(vmax,l2zm(0L))&&zumeqto(vumax,ul2zum(0UL))&&zldeqto(vldouble,d2zld(0.0))) null=1; else null=0;
if(zmeqto(vmax,l2zm(1L))&&zumeqto(vumax,ul2zum(1UL))&&zldeqto(vldouble,d2zld(1.0))) eins=1; else eins=0;
if(zmeqto(vmax,l2zm(-1L))&&zldeqto(vldouble,d2zld(-1.0))) eins=-1;
if(eins<0&&(c==MULT||c==DIV)){
if(DEBUG&1024){ printf("MULT/DIV with (-1) converted to MINUS:\n");pric2(stdout,p);}
p->code=c=MINUS;p->q2.flags=0;
changed=1;
}
if(c==LSHIFT||c==RSHIFT){
zmax size;
size=zmmult(sizetab[q1typ(p)&NQ],char_bit);
if(zmleq(size,vmax)){
if(c==LSHIFT){
if(DEBUG&1024){ printf("lshift converted to ASSIGN 0:\n");pric2(stdout,p);}
o.val.vmax=l2zm(0L);eval_const(&o.val,MAXINT);
insert_const(&p->q1.val,t);p->q1.flags=KONST;
p->code=c=ASSIGN;p->q2.flags=0;p->q2.val.vmax=sizetab[t&NQ];
changed=1;
}else{
if(DEBUG&1024){ printf("rshift changed to maxlength:\n");pric2(stdout,p);}
o.val.vmax=zmsub(size,l2zm(1L));eval_const(&o.val,MAXINT);
insert_const(&p->q2.val,t);
changed=1;
}
}
}
if((c==SUB||c==ADD||c==ADDI2P||c==SUBIFP)&&!(q2typ(p)&UNSIGNED)&&zmleq(vmax,l2zm(0L))&&zldleq(vldouble,d2zld(0.0))){
struct obj o;int ct=q2typ(p);
o=p->q2;
calc(MINUS,ct,&o.val,0,&o.val,0);
eval_const(&o.val,ct);
if(!zmleq(vmax,l2zm(0L))&&!zldleq(vldouble,d2zld(0.0))){
calc(MINUS,ct,&o.val,0,&o.val,0);
if(!compare_objs(&p->q2,&o,ct)){
if(DEBUG&1024){ printf("SUB converted to ADD:\n");pric2(stdout,p);}
calc(MINUS,ct,&p->q2.val,0,&p->q2.val,0);
if(p->code==ADD) p->code=SUB;
else if(p->code==SUB) p->code=ADD;
else if(p->code==ADDI2P) p->code=SUBIFP;
else if(p->code==SUBIFP) p->code=ADDI2P;
c=p->code;
changed=1;
}
}
}
if((eins>0&&(c==MULT||c==DIV))||(null&&(c==ADD||c==SUB||c==ADDI2P||c==SUBIFP||c==LSHIFT||c==RSHIFT||c==OR||c==XOR))){
if(DEBUG&1024){ printf("operation converted to simple assignment:\n");pric2(stdout,p);}
if(c==ADDI2P||c==SUBIFP) p->typf=t=p->typf2;
p->code=c=ASSIGN;p->q2.flags=0;p->q2.val.vmax=sizetab[t&NQ];
changed=1;
}
if(null&&(c==MULT||c==DIV||c==MOD||c==AND)){
if(c==DIV||c==MOD){ err_ic=p;error(210);err_ic=0;}
if(DEBUG&1024){ printf("operation converted to ASSIGN 0:\n");pric2(stdout,p);}
o.val.vmax=l2zm(0L);eval_const(&o.val,MAXINT);
insert_const(&p->q1.val,t);p->q1.flags=KONST;
p->code=c=ASSIGN;p->q2.flags=0;p->q2.val.vmax=sizetab[t&NQ];
changed=1;
}
if((ISINT(t)||fp_assoc)&&(c==ADD||c==SUB||c==ADDI2P||c==SUBIFP||c==MULT||c==LSHIFT||c==RSHIFT||c==OR||c==AND)){
/* assoziative Operatoren */
struct IC *n=p->next;
int nc,tp,tn;
tp=q2typ(p);
if(n){
nc=n->code;
tn=q2typ(n);
if(c==ADD&&nc==SUB) nc=ADD;
if(c==ADDI2P&&nc==SUBIFP) nc=ADDI2P;
if(c==SUB&&nc==ADD) nc=SUB;
if(c==SUBIFP&&nc==ADDI2P) nc=SUBIFP;
}
if(n&&nc==c&&(n->q2.flags&KONST)&&tn==tp&&n->q1.flags==p->z.flags&&n->q1.v==p->z.v&&zmeqto(n->q1.val.vmax,p->z.val.vmax)){
if(p->q1.flags==p->z.flags&&p->q1.v==p->z.v&&zmeqto(p->q1.val.vmax,p->z.val.vmax)){
if(n->q1.flags==n->z.flags&&n->q1.v==n->z.v&&zmeqto(n->q1.val.vmax,n->z.val.vmax)){
if(DEBUG&1024){ printf("using associativity(1) with:\n");pric2(stdout,p);pric2(stdout,p->next);}
n->q1=p->q1;
if(nc!=n->code){
gval.vmax=l2zm(0L);
eval_const(&gval,MAXINT);
insert_const(&gval,t);
calc(SUB,tn,&gval,&n->q2.val,&n->q2.val,0);
n->code=nc;
}
if(c==LSHIFT||c==RSHIFT||c==ADDI2P||c==SUB||c==SUBIFP)
calc(ADD,tp,&p->q2.val,&n->q2.val,&n->q2.val,0);
else
calc(c,tp,&p->q2.val,&n->q2.val,&n->q2.val,0);
changed=1;
if(DEBUG&1024) printf("must remove first operation\n");
n=p;p=p->next;
if(have_alias){ free(n->use_list); free(n->change_list); }
remove_IC(n);
continue;
}
}else{
if(DEBUG&1024){ printf("using associativity(2) with:\n");pric2(stdout,p);pric2(stdout,p->next);}
n->q1=p->q1;
if(nc!=n->code){
gval.vmax=l2zm(0L);
eval_const(&gval,MAXINT);
insert_const(&gval,t);
calc(SUB,tn,&gval,&n->q2.val,&n->q2.val,0);
n->code=nc;
}
if(c==LSHIFT||c==RSHIFT||c==ADDI2P||c==SUB||c==SUBIFP)
calc(ADD,tp,&p->q2.val,&n->q2.val,&n->q2.val,0);
else
calc(c,tp,&p->q2.val,&n->q2.val,&n->q2.val,0);
changed=1;
}
}
}
if((c==ADDI2P||c==SUBIFP)&&(p->q1.flags&VARADR)){
/* add #var,#const -> move #var+const */
union atyps val;
if(DEBUG&1024){printf("add/sub #var,#const changed to assign:\n");pric2(stdout,p);}
eval_const(&p->q2.val,t);
insert_const(&val,MAXINT);
if(c==ADDI2P)
calc(ADD,MAXINT,&p->q1.val,&val,&p->q1.val,0);
else
calc(SUB,MAXINT,&p->q1.val,&val,&p->q1.val,0);
p->code=c=ASSIGN;
p->q2.flags=0;
p->typf=t=p->typf2;
p->q2.val.vmax=sizetab[t&NQ];
changed=1;
}
if((c==ADD||c==SUB)&&ISINT(t)&&p->next&&p->next->next){
/*FIXME: using SCRATCH is not nice */
struct IC *p1=p->next,*p2=p1->next;
if(p1->code==MULT&&p2->code==ADDI2P&&
p1->typf==t&&p2->typf==t&&
(p1->q2.flags&KONST)&&(p->z.flags&(SCRATCH|DREFOBJ))==SCRATCH&&(p1->z.flags&(SCRATCH|DREFOBJ))==SCRATCH&&
!compare_objs(&p->z,&p1->q1,t)&&
!compare_objs(&p1->z,&p2->q2,t)){
if(DEBUG&1024){ printf("rearranging array-access(1):\n");pric2(stdout,p);pric2(stdout,p1);pric2(stdout,p2);}
p1->q1=p->q1;
p->q1=p2->q1;
p2->q1=p2->z;
p->z=p2->z;
calc(MULT,t,&p->q2.val,&p1->q2.val,&p->q2.val,0);
if(c==ADD) p->code=ADDI2P; else p->code=SUBIFP;
p->typf2=p2->typf2;
if(!(p->q1.flags&VARADR)){
/* for static addresses it is best to add the constant
part of the offset first (can be folded); for others
the constant part might better be the last, as it can
frequentlz be reduced bz addressing-modes */
if(DEBUG&1024) printf("reversing\n");
p2->q1=p->q1;
p->q1=p->z;
if(p->prev) p->prev->next=p1;
p1->prev=p->prev;
if(p==first_ic) first_ic=p1;
p->next=p2->next;
if(p->next) p->next->prev=p;
p->prev=p2;
p2->next=p;
p=p1;
}
changed=1;continue;
}
}
}
if(p->q1.flags&KONST){
/* algebraische Optimierungen */
eval_const(&p->q1.val,t);
if(zmeqto(vmax,l2zm(0L))&&zumeqto(vumax,ul2zum(0UL))&&zldeqto(vldouble,d2zld(0.0))) null=1; else null=0;
if(null&&(c==DIV||c==MOD||c==LSHIFT||c==RSHIFT)){
if(DEBUG&1024){ printf("operation converted to ASSIGN 0:\n");pric2(stdout,p);}
o.val.vmax=l2zm(0L);eval_const(&o.val,MAXINT);
insert_const(&p->q1.val,t);p->q1.flags=KONST;
p->code=c=ASSIGN;p->q2.flags=0;p->q2.val.vmax=sizetab[t&NQ];
changed=1;
}
}
if(!USEQ2ASZ&&p->z.flags&&!compare_objs(&p->q2,&p->z,p->typf)){
if(c==ADD||c==MULT||(c>=OR&&c<=AND)){
struct obj o;
if(DEBUG&1024){printf("swapping objs because USEQ2ASZ\n");pric2(stdout,p);}
o=p->q2;p->q2=p->q1;p->q1=o;
/* kein changed hier! */
}else{pric2(stdout,p); ierror(0);}
}
if((c==ADD||c==SUB)&&p->next){
/*FIXME: using SCRATCH is not nice */
struct IC *p1=p->next;
if(p1->code==ADDI2P&&p1->typf==t&&(p->z.flags&(SCRATCH|DREFOBJ))==SCRATCH&&!compare_objs(&p->z,&p1->q2,t)){
if(DEBUG&1024){ printf("rearranging array-access(2):\n");pric2(stdout,p);pric2(stdout,p1);}
p1->q2=p->q1;
p->q1=p1->q1;
p->z=p1->z;
p1->q1=p1->z;
if(c==ADD) p->code=c=ADDI2P; else p->code=c=SUBIFP;
p->typf2=p1->typf2;
changed=1;continue;
}
}
if((c==SUB||c==DIV||c==MOD)&&!compare_objs(&p->q1,&p->q2,p->typf)){
/* x-x=0, x/x=1, x%x=0 */
if(DEBUG&1024){ printf("i-i, i/i, i%%i converted to ASSIGN 0/1:\n");pric2(stdout,p);}
if(c==DIV) o.val.vmax=l2zm(1L); else o.val.vmax=l2zm(0L);
eval_const(&o.val,MAXINT);insert_const(&p->q1.val,t);p->q1.flags=KONST;
p->code=c=ASSIGN;p->q2.flags=0;p->q2.val.vmax=sizetab[t&NQ];
changed=1;
}
if(c==ASSIGN&&(p->z.flags&VAR)&&p->z.flags==p->q1.flags&&p->z.v==p->q1.v&&zmeqto(p->z.val.vmax,p->q1.val.vmax)){
struct IC *d;
if(DEBUG&1024){ printf("removing redundant move:\n");pric2(stdout,p);}
changed=1;
d=p; p=p->next;
if(have_alias){ free(d->use_list); free(d->change_list);}
remove_IC(d); continue;
}
if(c>=BEQ&&c<=BGT){
struct IC *p2=p->prev;
if(p2&&p2->code==COMPARE&&!compare_objs(&p->q1,&p2->z,0)){
struct IC *p3=p2->prev;
if(p3&&p3->code==c){
struct IC *p4=p3->prev;
if(p4->code==COMPARE&&!compare_objs(&p3->q1,&p4->z,0)
&&!compare_objs(&p2->q1,&p4->q1,p4->typf)&&!compare_objs(&p2->q2,&p4->q2,p4->typf)){
if(DEBUG&1024){printf("removing redundant compare\n");pric2(stdout,p2);pric2(stdout,p);}
p->code=NOP;
p->q1.flags=p->q2.flags=p->z.flags=0;
p->typf=0;
p2->code=NOP;
p2->typf=0;
p2->q1.flags=p2->q2.flags=p2->z.flags=0;
changed=1;
}
}
}
}
p=p->next;
}
if(changed) done|=changed;
gchanged|=changed;
}while(changed);
return done;
}
void insert_loads()
/* Laedt Speicher in temporaere Variablen */
{
struct IC *p,*new;
struct Typ t={0},v={VOID};
int c;
if(DEBUG&1024) printf("insert_loads()\n");
for(p=first_ic;p;p=p->next){
c=p->code;
if(p->q2.flags||c==PUSH){
if((dref_cse&&(p->q1.flags&DREFOBJ))||((p->q1.flags&(VAR|VARADR))==VAR&&(p->q1.v->storage_class==EXTERN||p->q1.v->storage_class==STATIC))){
new=new_IC();
new->code=ASSIGN;
new->typf=q1typ(p);
if(ISSCALAR(new->typf)){
new->q1.am=new->q2.am=new->z.am;
new->q1=p->q1;
new->q2.flags=0;
new->q2.val.vmax=sizetab[new->typf&NQ];
new->z.flags=VAR;
new->z.val.vmax=l2zm(0L);
t.flags=new->typf;
if(ISPOINTER(new->typf)) t.next=&v; else t.next=0;
new->z.v=add_tmp_var(clone_typ(&t));
insert_IC(p->prev,new);
p->q1=new->z;
}else
free(new);
}
if((dref_cse&&(p->q2.flags&DREFOBJ))||(static_cse&&(p->q2.flags&(VAR|VARADR))==VAR&&(p->q2.v->storage_class==EXTERN||p->q2.v->storage_class==STATIC))){
new=new_IC();
new->code=ASSIGN;
new->typf=q2typ(p);
if(ISSCALAR(new->typf)){
new->q1.am=new->q2.am=new->z.am;
new->q1=p->q2;
new->q2.flags=0;
new->q2.val.vmax=sizetab[new->typf&NQ];
new->z.flags=VAR;
new->z.val.vmax=l2zm(0L);
t.flags=new->typf;
if(ISPOINTER(new->typf)) t.next=&v; else t.next=0;
new->z.v=add_tmp_var(clone_typ(&t));
insert_IC(p->prev,new);
p->q2=new->z;
}else
free(new);
}
if(p->q2.flags&&((dref_cse&&(p->z.flags&DREFOBJ))||(static_cse&&(p->z.flags&(VAR|VARADR))==VAR&&(p->z.v->storage_class==EXTERN||p->z.v->storage_class==STATIC)))){
/* translate x op y -> mem to x op y -> tmp; move tmp -> mem */
new=new_IC();
new->code=ASSIGN;
new->typf=ztyp(p);
if(ISSCALAR(new->typf)){
new->q1.am=new->q2.am=new->z.am;
new->z=p->z;
new->q2.flags=0;
new->q2.val.vmax=sizetab[new->typf&NQ];
new->q1.flags=VAR;
new->q1.val.vmax=l2zm(0L);
t.flags=new->typf;
if(ISPOINTER(new->typf)) t.next=&v; else t.next=0;
new->q1.v=add_tmp_var(clone_typ(&t));
insert_IC(p,new);
p->z=new->q1;
}else
free(new);
}
}
}
}
void insert_ccs(void)
/* Fuegt Variablen fuer ccs ein. */
{
struct IC *p; struct Var *v; struct Typ *t;
if(DEBUG&1024) printf("insert_ccs()\n");
for(p=first_ic;p;p=p->next){
if(p->code==COMPARE||p->code==TEST){
p->z.flags=VAR;
p->z.val.vmax=l2zm(0L);
t=new_typ();
t->flags=0;
v=add_tmp_var(t);
p->z.v=v;
p=p->next;
if(p->code<BEQ||p->code>BGT){
p=p->prev;
p->code=NOP;
p->q1.flags=p->q2.flags=p->z.flags=0;
p->typf=0;
}else{
p->q1.flags=VAR;
p->q1.val.vmax=l2zm(0L);
p->q1.v=v;
}
}
}
}
static int to_be_inlined(struct Var *v)
{
/* decide whether function should be inlined */
int c;struct IC *p;