void
usedset(Node *n, int o)
{
if(n->op == OLIST) {
usedset(n->left, o);
usedset(n->right, o);
return;
}
complex(n);
if(o == OPREFETCH) {
gprefetch(n);
return;
}
switch(n->op) {
case OADDR: /* volatile */
gins(ANOP, n, Z);
break;
case ONAME:
if(o == OSET)
gins(ANOP, Z, n);
else
gins(ANOP, n, Z);
break;
}
}
void
smod2(int32 c, int v, Node *l, Node *n)
{
Node nod;
if(c == 1) {
zeroregm(n);
return;
}
sext(&nod, n, l);
if(v == 0) {
zeroregm(n);
gins(AXORL, &nod, n);
gins(ASUBL, &nod, n);
}
else if(v > 1) {
gins(AANDL, nodconst((1 << v) - 1), &nod);
gins(AADDL, &nod, n);
gins(AANDL, nodconst((1 << v) - 1), n);
gins(ASUBL, &nod, n);
}
else {
gins(AANDL, nodconst(1), n);
gins(AXORL, &nod, n);
gins(ASUBL, &nod, n);
}
regfree(&nod);
}
void
sext(Node *d, Node *s, Node *l)
{
if(s->reg == D_AX && !nodreg(d, Z, D_DX)) {
reg[D_DX]++;
gins(ACDQ, Z, Z);
}
else {
regalloc(d, l, Z);
gins(AMOVL, s, d);
gins(ASARL, nodconst(31), d);
}
}
void
noretval(int n)
{
if(n & 1) {
gins(ANOP, Z, Z);
p->to.type = D_REG;
p->to.reg = REGRET;
}
if(n & 2) {
gins(ANOP, Z, Z);
p->to.type = D_FREG;
p->to.reg = FREGRET;
}
}
void
gdata(Node *nam, Node *nr, int wid)
{
Prog *p;
vlong v;
if(nr->op == OLITERAL) {
switch(nr->val.ctype) {
case CTCPLX:
gdatacomplex(nam, nr->val.u.cval);
return;
case CTSTR:
gdatastring(nam, nr->val.u.sval);
return;
}
}
if(wid == 8 && is64(nr->type)) {
v = mpgetfix(nr->val.u.xval);
p = gins(ADATA, nam, nodintconst(v));
p->reg = 4;
p = gins(ADATA, nam, nodintconst(v>>32));
p->reg = 4;
p->from.offset += 4;
return;
}
void
gdatastring(Node *nam, Strlit *sval)
{
Prog *p;
Node nod1;
p = gins(ADATA, nam, N);
datastring(sval->s, sval->len, &p->to);
p->from.scale = types[tptr]->width;
p->to.index = p->to.type;
p->to.type = D_ADDR;
//print("%P\n", p);
nodconst(&nod1, types[TINT], sval->len);
p = gins(ADATA, nam, &nod1);
p->from.scale = widthint;
p->from.offset += widthptr;
}
void
gdatacomplex(Node *nam, Mpcplx *cval)
{
Prog *p;
int w;
w = cplxsubtype(nam->type->etype);
w = types[w]->width;
p = gins(ADATA, nam, N);
p->from.scale = w;
p->to.type = D_FCONST;
p->to.u.dval = mpgetflt(&cval->real);
p = gins(ADATA, nam, N);
p->from.scale = w;
p->from.offset += w;
p->to.type = D_FCONST;
p->to.u.dval = mpgetflt(&cval->imag);
}
void
gdata(Node *nam, Node *nr, int wid)
{
Prog *p;
vlong v;
if(wid == 8 && is64(nr->type)) {
v = mpgetfix(nr->val.u.xval);
p = gins(ADATA, nam, nodintconst(v));
p->reg = 4;
p = gins(ADATA, nam, nodintconst(v>>32));
p->reg = 4;
p->from.offset += 4;
return;
}
int
dsname(Sym *s, int off, char *t, int n)
{
Prog *p;
p = gins(ADATA, N, N);
p->from.type = D_EXTERN;
p->from.index = D_NONE;
p->from.offset = off;
p->from.scale = n;
p->from.sym = linksym(s);
p->to.type = D_SCONST;
p->to.index = D_NONE;
memmove(p->to.u.sval, t, n);
return off + n;
}
void
gdata(Node *nam, Node *nr, int wid)
{
Prog *p;
if(nr->op == OLITERAL) {
switch(nr->val.ctype) {
case CTCPLX:
gdatacomplex(nam, nr->val.u.cval);
return;
case CTSTR:
gdatastring(nam, nr->val.u.sval);
return;
}
}
p = gins(ADATA, nam, nr);
p->from.scale = wid;
}
int
dsymptr(Sym *s, int off, Sym *x, int xoff)
{
Prog *p;
off = rnd(off, widthptr);
p = gins(ADATA, N, N);
p->from.type = D_EXTERN;
p->from.index = D_NONE;
p->from.sym = linksym(s);
p->from.offset = off;
p->from.scale = widthptr;
p->to.type = D_ADDR;
p->to.index = D_EXTERN;
p->to.sym = linksym(x);
p->to.offset = xoff;
off += widthptr;
return off;
}
int
dstringptr(Sym *s, int off, char *str)
{
Prog *p;
off = rnd(off, widthptr);
p = gins(ADATA, N, N);
p->from.type = D_EXTERN;
p->from.index = D_NONE;
p->from.sym = linksym(s);
p->from.offset = off;
p->from.scale = widthptr;
datastring(str, strlen(str)+1, &p->to);
p->to.index = p->to.type;
p->to.type = D_ADDR;
p->to.etype = simtype[TINT];
off += widthptr;
return off;
}
void
sdivgen(Node *l, Node *r, Node *ax, Node *dx)
{
int a, s;
uint32 m;
vlong c;
c = r->vconst;
if(c < 0)
c = -c;
a = sdiv(c, &m, &s);
//print("a=%d i=%ld s=%d m=%lux\n", a, (int32)r->vconst, s, m);
gins(AMOVL, nodconst(m), ax);
gins(AIMULL, l, Z);
gins(AMOVL, l, ax);
if(a)
gins(AADDL, ax, dx);
gins(ASHRL, nodconst(31), ax);
gins(ASARL, nodconst(s), dx);
gins(AADDL, ax, dx);
if(r->vconst < 0)
gins(ANEGL, Z, dx);
}
int
dsname(Sym *sym, int off, char *t, int n)
{
Prog *p;
p = gins(ADATA, N, N);
p->from.type = D_OREG;
p->from.name = D_EXTERN;
p->from.etype = TINT32;
p->from.offset = off;
p->from.reg = NREG;
p->from.sym = sym;
p->reg = n;
p->to.type = D_SCONST;
p->to.name = D_NONE;
p->to.reg = NREG;
p->to.offset = 0;
memmove(p->to.sval, t, n);
return off + n;
}
int
dgostrlitptr(Sym *s, int off, Strlit *lit)
{
Prog *p;
if(lit == nil)
return duintptr(s, off, 0);
off = rnd(off, widthptr);
p = gins(ADATA, N, N);
p->from.type = D_EXTERN;
p->from.index = D_NONE;
p->from.sym = linksym(s);
p->from.offset = off;
p->from.scale = widthptr;
datagostring(lit, &p->to);
p->to.index = p->to.type;
p->to.type = D_ADDR;
p->to.etype = simtype[TINT];
off += widthptr;
return off;
}
void
sdiv2(int32 c, int v, Node *l, Node *n)
{
Node nod;
if(v > 0) {
if(v > 1) {
sext(&nod, n, l);
gins(AANDL, nodconst((1 << v) - 1), &nod);
gins(AADDL, &nod, n);
regfree(&nod);
}
else {
gins(ACMPL, n, nodconst(0x80000000));
gins(ASBBL, nodconst(-1), n);
}
gins(ASARL, nodconst(v), n);
}
if(c < 0)
gins(ANEGL, Z, n);
}
/*
* make a refer to the string sval,
* emitting DATA if needed.
*/
void
datagostring(Strlit *sval, Addr *a)
{
Prog *p;
Addr ac, ao, ap;
int32 wi, wp;
static int gen;
memset(&ac, 0, sizeof(ac));
memset(&ao, 0, sizeof(ao));
memset(&ap, 0, sizeof(ap));
// constant
ac.type = D_CONST;
ac.name = D_NONE;
ac.offset = 0; // fill in
ac.reg = NREG;
// string len+ptr
ao.type = D_OREG;
ao.name = D_STATIC; // fill in
ao.etype = TINT32;
ao.sym = nil; // fill in
ao.reg = NREG;
// $string len+ptr
datastring(sval->s, sval->len, &ap);
ap.type = D_CONST;
ap.etype = TINT32;
wi = types[TUINT32]->width;
wp = types[tptr]->width;
if(ap.name == D_STATIC) {
// huge strings are made static to avoid long names
snprint(namebuf, sizeof(namebuf), ".gostring.%d", ++gen);
ao.sym = lookup(namebuf);
ao.name = D_STATIC;
} else {
// small strings get named by their contents,
// so that multiple modules using the same string
// can share it.
snprint(namebuf, sizeof(namebuf), "\"%Z\"", sval);
ao.sym = pkglookup(namebuf, gostringpkg);
ao.name = D_EXTERN;
}
*a = ao;
if(ao.sym->flags & SymUniq)
return;
ao.sym->flags |= SymUniq;
data();
// DATA gostring, wp, $cstring
p = pc;
gins(ADATA, N, N);
p->from = ao;
p->reg = wp;
p->to = ap;
// DATA gostring+wp, wi, $len
p = pc;
gins(ADATA, N, N);
p->from = ao;
p->from.offset = wp;
p->reg = wi;
p->to = ac;
p->to.offset = sval->len;
p = pc;
ggloblsym(ao.sym, types[TSTRING]->width, ao.name == D_EXTERN);
if(ao.name == D_STATIC)
p->from.name = D_STATIC;
text();
}
void
cgenrel(Node *n, Node *nn, int inrel)
{
Node *l, *r;
Prog *p1;
Node nod, nod1, nod2, nod3, nod4;
int o, t;
long v, curs;
if(debug['g']) {
prtree(nn, "cgen lhs");
prtree(n, "cgen");
}
if(n == Z || n->type == T)
return;
if(typesu[n->type->etype]) {
sugen(n, nn, n->type->width);
return;
}
l = n->left;
r = n->right;
o = n->op;
if(n->addable >= INDEXED) {
if(nn == Z) {
switch(o) {
default:
nullwarn(Z, Z);
break;
case OINDEX:
nullwarn(l, r);
break;
}
return;
}
gmove(n, nn);
return;
}
curs = cursafe;
if(n->complex >= FNX)
if(l->complex >= FNX)
if(r != Z && r->complex >= FNX)
switch(o) {
default:
if(cond(o) && typesu[l->type->etype])
break;
regret(&nod, r);
cgen(r, &nod);
regsalloc(&nod1, r);
gopcode(OAS, &nod, Z, &nod1);
regfree(&nod);
nod = *n;
nod.right = &nod1;
cgen(&nod, nn);
return;
case OFUNC:
case OCOMMA:
case OANDAND:
case OOROR:
case OCOND:
case ODOT:
break;
}
switch(o) {
default:
diag(n, "unknown op in cgen: %O", o);
break;
case ONEG:
case OCOM:
if(nn == Z) {
nullwarn(l, Z);
break;
}
regalloc(&nod, l, nn);
cgen(l, &nod);
gopcode(o, &nod, Z, &nod);
gmove(&nod, nn);
regfree(&nod);
break;
case OAS:
if(l->op == OBIT)
goto bitas;
if(l->addable >= INDEXED && l->complex < FNX) {
if(nn != Z || r->addable < INDEXED) { /* || hardconst(r) */
if(r->complex >= FNX && nn == Z)
regret(&nod, r);
else
regalloc(&nod, r, nn);
cgen(r, &nod);
gmove(&nod, l);
if(nn != Z)
gmove(&nod, nn);
regfree(&nod);
} else
gmove(r, l);
break;
}
if(l->complex >= r->complex) {
/* TO DO: see 6c for OINDEX && immconst(r) */
reglcgen(&nod1, l, Z);
if(r->addable >= INDEXED) { /* && !hardconst(r) */
gmove(r, &nod1);
if(nn != Z)
gmove(r, nn);
regfree(&nod1);
break;
}
regalloc(&nod, r, nn);
cgen(r, &nod);
} else {
regalloc(&nod, r, nn);
cgen(r, &nod);
reglcgen(&nod1, l, Z);
}
gmove(&nod, &nod1);
regfree(&nod);
regfree(&nod1);
break;
bitas:
n = l->left;
regalloc(&nod, r, nn);
if(l->complex >= r->complex) {
reglcgen(&nod1, n, Z);
cgen(r, &nod);
} else {
cgen(r, &nod);
reglcgen(&nod1, n, Z);
}
regalloc(&nod2, n, Z);
gopcode(OAS, &nod1, Z, &nod2);
bitstore(l, &nod, &nod1, &nod2, nn);
break;
case OBIT:
if(nn == Z) {
nullwarn(l, Z);
break;
}
bitload(n, &nod, Z, Z, nn);
gopcode(OAS, &nod, Z, nn);
regfree(&nod);
break;
case ODIV:
case OMOD:
if(nn != Z)
if((t = vlog(r)) >= 0) {
/* signed div/mod by constant power of 2 */
cgen(l, nn);
gopcode(OGE, nodconst(0), nn, Z);
p1 = p;
if(o == ODIV) {
gopcode(OADD, nodconst((1<<t)-1), Z, nn);
patch(p1, pc);
gopcode(OASHR, nodconst(t), Z, nn);
} else {
gopcode(ONEG, nn, Z, nn);
gopcode(OAND, nodconst((1<<t)-1), Z, nn);
gopcode(ONEG, nn, Z, nn);
gbranch(OGOTO);
patch(p1, pc);
p1 = p;
gopcode(OAND, nodconst((1<<t)-1), Z, nn);
patch(p1, pc);
}
break;
}
goto muldiv;
case OXOR:
#ifdef NOTYET
if(nn != Z)
if(r->op == OCONST && r->vconst == -1){
cgen(l, nn);
gopcode(OCOM, nn, Z, nn);
break;
}
#endif
case OSUB:
case OADD:
case OAND:
case OOR:
case OLSHR:
case OASHL:
case OASHR:
/*
* immediate operands
*/
if(nn != Z)
if(r->op == OCONST)
if(!typefd[n->type->etype]) {
cgen(l, nn);
if(r->vconst == 0)
if(o != OAND)
break;
if(nn != Z)
gopcode(o, r, Z, nn);
break;
}
case OLMUL:
case OLDIV:
case OLMOD:
case OMUL:
muldiv:
if(nn == Z) {
nullwarn(l, r);
break;
}
if(o == OMUL || o == OLMUL) {
if(mulcon(n, nn))
break;
}
if(l->complex >= r->complex) {
regalloc(&nod, l, nn);
cgen(l, &nod);
regalloc(&nod1, l, Z); /* note: l used for type, so shifts work! */
cgen(r, &nod1);
gopcode(o, &nod1, Z, &nod);
} else {
regalloc(&nod, l, nn); /* note: l used for type, so shifts work! */
cgen(r, &nod);
regalloc(&nod1, l, Z);
cgen(l, &nod1);
gopcode(o, &nod, &nod1, &nod);
}
gopcode(OAS, &nod, Z, nn);
regfree(&nod);
regfree(&nod1);
break;
case OASLSHR:
case OASASHL:
case OASASHR:
case OASAND:
case OASADD:
case OASSUB:
case OASXOR:
case OASOR:
if(l->op == OBIT)
goto asbitop;
if(r->op == OCONST)
if(!typefd[r->type->etype])
if(!typefd[n->type->etype]) {
if(l->addable < INDEXED)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
regalloc(&nod, l, nn); /* note: l used for type, so shifts work! */
gopcode(OAS, &nod2, Z, &nod);
gopcode(o, r, Z, &nod);
gopcode(OAS, &nod, Z, &nod2);
regfree(&nod);
if(l->addable < INDEXED)
regfree(&nod2);
break;
}
case OASLMUL:
case OASLDIV:
case OASLMOD:
case OASMUL:
case OASDIV:
case OASMOD:
if(l->op == OBIT)
goto asbitop;
if(l->complex >= r->complex) {
if(l->addable < INDEXED)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
regalloc(&nod, n, nn);
cgen(r, &nod);
} else {
regalloc(&nod, n, nn);
cgen(r, &nod);
if(l->addable < INDEXED)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
}
regalloc(&nod1, n, Z);
gopcode(OAS, &nod2, Z, &nod1);
if(nod1.type->etype != nod.type->etype){
regalloc(&nod3, &nod, Z);
gmove(&nod1, &nod3);
regfree(&nod1);
nod1 = nod3;
}
gopcode(o, &nod, &nod1, &nod);
gmove(&nod, &nod2);
if(nn != Z)
gmove(&nod, nn);
regfree(&nod);
regfree(&nod1);
if(l->addable < INDEXED)
regfree(&nod2);
break;
asbitop:
regalloc(&nod4, n, nn);
regalloc(&nod3, r, Z);
if(l->complex >= r->complex) {
bitload(l, &nod, &nod1, &nod2, &nod4);
cgen(r, &nod3);
} else {
cgen(r, &nod3);
bitload(l, &nod, &nod1, &nod2, &nod4);
}
gmove(&nod, &nod4);
gopcode(o, &nod3, Z, &nod4);
regfree(&nod3);
gmove(&nod4, &nod);
regfree(&nod4);
bitstore(l, &nod, &nod1, &nod2, nn);
break;
case OADDR:
if(nn == Z) {
nullwarn(l, Z);
break;
}
lcgen(l, nn);
break;
case OFUNC:
l = uncomma(l);
if(l->complex >= FNX) {
if(l->op != OIND)
diag(n, "bad function call");
regret(&nod, l->left);
cgen(l->left, &nod);
regsalloc(&nod1, l->left);
gopcode(OAS, &nod, Z, &nod1);
regfree(&nod);
nod = *n;
nod.left = &nod2;
nod2 = *l;
nod2.left = &nod1;
nod2.complex = 1;
cgen(&nod, nn);
return;
}
if(REGARG >= 0)
o = reg[REGARG];
gargs(r, &nod, &nod1);
if(l->addable < INDEXED) {
reglcgen(&nod, l, Z);
gopcode(OFUNC, Z, Z, &nod);
regfree(&nod);
} else
gopcode(OFUNC, Z, Z, l);
if(REGARG >= 0)
if(o != reg[REGARG])
reg[REGARG]--;
if(nn != Z) {
regret(&nod, n);
gopcode(OAS, &nod, Z, nn);
regfree(&nod);
}
break;
case OIND:
if(nn == Z) {
nullwarn(l, Z);
break;
}
regialloc(&nod, n, nn);
r = l;
while(r->op == OADD)
r = r->right;
if(sconst(r) && (v = r->vconst+nod.xoffset) >= -4096 && v < 4096) {
v = r->vconst;
r->vconst = 0;
cgen(l, &nod);
nod.xoffset += v;
r->vconst = v;
} else
cgen(l, &nod);
regind(&nod, n);
gopcode(OAS, &nod, Z, nn);
regfree(&nod);
break;
case OEQ:
case ONE:
case OLE:
case OLT:
case OGE:
case OGT:
case OLO:
case OLS:
case OHI:
case OHS:
if(nn == Z) {
nullwarn(l, r);
break;
}
boolgen(n, 1, nn);
break;
case OANDAND:
case OOROR:
boolgen(n, 1, nn);
if(nn == Z)
patch(p, pc);
break;
case ONOT:
if(nn == Z) {
nullwarn(l, Z);
break;
}
boolgen(n, 1, nn);
break;
case OCOMMA:
cgen(l, Z);
cgen(r, nn);
break;
case OCAST:
if(nn == Z) {
nullwarn(l, Z);
break;
}
/*
* convert from types l->n->nn
*/
if(nocast(l->type, n->type) && nocast(n->type, nn->type)) {
/* both null, gen l->nn */
cgen(l, nn);
break;
}
if(ewidth[n->type->etype] < ewidth[l->type->etype]){
if(l->type->etype == TIND && typechlp[n->type->etype])
warn(n, "conversion of pointer to shorter integer");
}else if(0){
if(nocast(n->type, nn->type) || castup(n->type, nn->type)){
if(typefd[l->type->etype] != typefd[nn->type->etype])
regalloc(&nod, l, nn);
else
regalloc(&nod, nn, nn);
cgen(l, &nod);
gmove(&nod, nn);
regfree(&nod);
break;
}
}
regalloc(&nod, l, nn);
cgen(l, &nod);
regalloc(&nod1, n, &nod);
if(inrel)
gmover(&nod, &nod1);
else
gopcode(OAS, &nod, Z, &nod1);
gopcode(OAS, &nod1, Z, nn);
regfree(&nod1);
regfree(&nod);
break;
case ODOT:
sugen(l, nodrat, l->type->width);
if(nn != Z) {
warn(n, "non-interruptable temporary");
nod = *nodrat;
if(!r || r->op != OCONST) {
diag(n, "DOT and no offset");
break;
}
nod.xoffset += (long)r->vconst;
nod.type = n->type;
cgen(&nod, nn);
}
break;
case OCOND:
bcgen(l, 1);
p1 = p;
cgen(r->left, nn);
gbranch(OGOTO);
patch(p1, pc);
p1 = p;
cgen(r->right, nn);
patch(p1, pc);
break;
case OPOSTINC:
case OPOSTDEC:
v = 1;
if(l->type->etype == TIND)
v = l->type->link->width;
if(o == OPOSTDEC)
v = -v;
if(l->op == OBIT)
goto bitinc;
if(nn == Z)
goto pre;
if(l->addable < INDEXED)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
regalloc(&nod, l, nn);
gopcode(OAS, &nod2, Z, &nod);
regalloc(&nod1, l, Z);
if(typefd[l->type->etype]) {
regalloc(&nod3, l, Z);
if(v < 0) {
gopcode(OAS, nodfconst(-v), Z, &nod3);
gopcode(OSUB, &nod3, &nod, &nod1);
} else {
gopcode(OAS, nodfconst(v), Z, &nod3);
gopcode(OADD, &nod3, &nod, &nod1);
}
regfree(&nod3);
} else
gopcode(OADD, nodconst(v), &nod, &nod1);
gopcode(OAS, &nod1, Z, &nod2);
regfree(&nod);
regfree(&nod1);
if(l->addable < INDEXED)
regfree(&nod2);
break;
case OPREINC:
case OPREDEC:
v = 1;
if(l->type->etype == TIND)
v = l->type->link->width;
if(o == OPREDEC)
v = -v;
if(l->op == OBIT)
goto bitinc;
pre:
if(l->addable < INDEXED)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
regalloc(&nod, l, nn);
gopcode(OAS, &nod2, Z, &nod);
if(typefd[l->type->etype]) {
regalloc(&nod3, l, Z);
if(v < 0) {
gopcode(OAS, nodfconst(-v), Z, &nod3);
gopcode(OSUB, &nod3, Z, &nod);
} else {
gopcode(OAS, nodfconst(v), Z, &nod3);
gopcode(OADD, &nod3, Z, &nod);
}
regfree(&nod3);
} else
gopcode(OADD, nodconst(v), Z, &nod);
gopcode(OAS, &nod, Z, &nod2);
if(nn && l->op == ONAME) /* in x=++i, emit USED(i) */
gins(ANOP, l, Z);
regfree(&nod);
if(l->addable < INDEXED)
regfree(&nod2);
break;
bitinc:
if(nn != Z && (o == OPOSTINC || o == OPOSTDEC)) {
bitload(l, &nod, &nod1, &nod2, Z);
gopcode(OAS, &nod, Z, nn);
gopcode(OADD, nodconst(v), Z, &nod);
bitstore(l, &nod, &nod1, &nod2, Z);
break;
}
bitload(l, &nod, &nod1, &nod2, nn);
gopcode(OADD, nodconst(v), Z, &nod);
bitstore(l, &nod, &nod1, &nod2, nn);
break;
}
cursafe = curs;
return;
}
void
cgen(Node *n, Node *nn)
{
Node *l, *r, *t;
Prog *p1;
Node nod, nod1, nod2, nod3, nod4;
int o, hardleft;
int32 v, curs;
vlong c;
if(debug['g']) {
prtree(nn, "cgen lhs");
prtree(n, "cgen");
}
if(n == Z || n->type == T)
return;
if(typesu[n->type->etype]) {
sugen(n, nn, n->type->width);
return;
}
l = n->left;
r = n->right;
o = n->op;
if(n->op == OEXREG || (nn != Z && nn->op == OEXREG)) {
gmove(n, nn);
return;
}
if(n->addable >= INDEXED) {
if(nn == Z) {
switch(o) {
default:
nullwarn(Z, Z);
break;
case OINDEX:
nullwarn(l, r);
break;
}
return;
}
gmove(n, nn);
return;
}
curs = cursafe;
if(l->complex >= FNX)
if(r != Z && r->complex >= FNX)
switch(o) {
default:
if(cond(o) && typesu[l->type->etype])
break;
regret(&nod, r);
cgen(r, &nod);
regsalloc(&nod1, r);
gmove(&nod, &nod1);
regfree(&nod);
nod = *n;
nod.right = &nod1;
cgen(&nod, nn);
return;
case OFUNC:
case OCOMMA:
case OANDAND:
case OOROR:
case OCOND:
case ODOT:
break;
}
hardleft = l->addable < INDEXED || l->complex >= FNX;
switch(o) {
default:
diag(n, "unknown op in cgen: %O", o);
break;
case ONEG:
case OCOM:
if(nn == Z) {
nullwarn(l, Z);
break;
}
regalloc(&nod, l, nn);
cgen(l, &nod);
gopcode(o, n->type, Z, &nod);
gmove(&nod, nn);
regfree(&nod);
break;
case OAS:
if(l->op == OBIT)
goto bitas;
if(!hardleft) {
if(nn != Z || r->addable < INDEXED || hardconst(r)) {
if(r->complex >= FNX && nn == Z)
regret(&nod, r);
else
regalloc(&nod, r, nn);
cgen(r, &nod);
gmove(&nod, l);
if(nn != Z)
gmove(&nod, nn);
regfree(&nod);
} else
gmove(r, l);
break;
}
if(l->complex >= r->complex) {
if(l->op == OINDEX && immconst(r)) {
gmove(r, l);
break;
}
reglcgen(&nod1, l, Z);
if(r->addable >= INDEXED && !hardconst(r)) {
gmove(r, &nod1);
if(nn != Z)
gmove(r, nn);
regfree(&nod1);
break;
}
regalloc(&nod, r, nn);
cgen(r, &nod);
} else {
regalloc(&nod, r, nn);
cgen(r, &nod);
reglcgen(&nod1, l, Z);
}
gmove(&nod, &nod1);
regfree(&nod);
regfree(&nod1);
break;
bitas:
n = l->left;
regalloc(&nod, r, nn);
if(l->complex >= r->complex) {
reglcgen(&nod1, n, Z);
cgen(r, &nod);
} else {
cgen(r, &nod);
reglcgen(&nod1, n, Z);
}
regalloc(&nod2, n, Z);
gmove(&nod1, &nod2);
bitstore(l, &nod, &nod1, &nod2, nn);
break;
case OBIT:
if(nn == Z) {
nullwarn(l, Z);
break;
}
bitload(n, &nod, Z, Z, nn);
gmove(&nod, nn);
regfree(&nod);
break;
case OLSHR:
case OASHL:
case OASHR:
if(nn == Z) {
nullwarn(l, r);
break;
}
if(r->op == OCONST) {
if(r->vconst == 0) {
cgen(l, nn);
break;
}
regalloc(&nod, l, nn);
cgen(l, &nod);
if(o == OASHL && r->vconst == 1)
gopcode(OADD, n->type, &nod, &nod);
else
gopcode(o, n->type, r, &nod);
gmove(&nod, nn);
regfree(&nod);
break;
}
/*
* get nod to be D_CX
*/
if(nodreg(&nod, nn, D_CX)) {
regsalloc(&nod1, n);
gmove(&nod, &nod1);
cgen(n, &nod); /* probably a bug */
gmove(&nod, nn);
gmove(&nod1, &nod);
break;
}
reg[D_CX]++;
if(nn->op == OREGISTER && nn->reg == D_CX)
regalloc(&nod1, l, Z);
else
regalloc(&nod1, l, nn);
if(r->complex >= l->complex) {
cgen(r, &nod);
cgen(l, &nod1);
} else {
cgen(l, &nod1);
cgen(r, &nod);
}
gopcode(o, n->type, &nod, &nod1);
gmove(&nod1, nn);
regfree(&nod);
regfree(&nod1);
break;
case OADD:
case OSUB:
case OOR:
case OXOR:
case OAND:
if(nn == Z) {
nullwarn(l, r);
break;
}
if(typefd[n->type->etype])
goto fop;
if(r->op == OCONST) {
if(r->vconst == 0 && o != OAND) {
cgen(l, nn);
break;
}
}
if(n->op == OADD && l->op == OASHL && l->right->op == OCONST
&& (r->op != OCONST || r->vconst < -128 || r->vconst > 127)) {
c = l->right->vconst;
if(c > 0 && c <= 3) {
if(l->left->complex >= r->complex) {
regalloc(&nod, l->left, nn);
cgen(l->left, &nod);
if(r->addable < INDEXED) {
regalloc(&nod1, r, Z);
cgen(r, &nod1);
genmuladd(&nod, &nod, 1 << c, &nod1);
regfree(&nod1);
}
else
genmuladd(&nod, &nod, 1 << c, r);
}
else {
regalloc(&nod, r, nn);
cgen(r, &nod);
regalloc(&nod1, l->left, Z);
cgen(l->left, &nod1);
genmuladd(&nod, &nod1, 1 << c, &nod);
regfree(&nod1);
}
gmove(&nod, nn);
regfree(&nod);
break;
}
}
if(r->addable >= INDEXED && !hardconst(r)) {
regalloc(&nod, l, nn);
cgen(l, &nod);
gopcode(o, n->type, r, &nod);
gmove(&nod, nn);
regfree(&nod);
break;
}
if(l->complex >= r->complex) {
regalloc(&nod, l, nn);
cgen(l, &nod);
regalloc(&nod1, r, Z);
cgen(r, &nod1);
gopcode(o, n->type, &nod1, &nod);
} else {
regalloc(&nod1, r, nn);
cgen(r, &nod1);
regalloc(&nod, l, Z);
cgen(l, &nod);
gopcode(o, n->type, &nod1, &nod);
}
gmove(&nod, nn);
regfree(&nod);
regfree(&nod1);
break;
case OLMOD:
case OMOD:
case OLMUL:
case OLDIV:
case OMUL:
case ODIV:
if(nn == Z) {
nullwarn(l, r);
break;
}
if(typefd[n->type->etype])
goto fop;
if(r->op == OCONST && typechl[n->type->etype]) { /* TO DO */
SET(v);
switch(o) {
case ODIV:
case OMOD:
c = r->vconst;
if(c < 0)
c = -c;
v = xlog2(c);
if(v < 0)
break;
/* fall thru */
case OMUL:
case OLMUL:
regalloc(&nod, l, nn);
cgen(l, &nod);
switch(o) {
case OMUL:
case OLMUL:
mulgen(n->type, r, &nod);
break;
case ODIV:
sdiv2(r->vconst, v, l, &nod);
break;
case OMOD:
smod2(r->vconst, v, l, &nod);
break;
}
gmove(&nod, nn);
regfree(&nod);
goto done;
case OLDIV:
c = r->vconst;
if((c & 0x80000000) == 0)
break;
regalloc(&nod1, l, Z);
cgen(l, &nod1);
regalloc(&nod, l, nn);
zeroregm(&nod);
gins(ACMPL, &nod1, nodconst(c));
gins(ASBBL, nodconst(-1), &nod);
regfree(&nod1);
gmove(&nod, nn);
regfree(&nod);
goto done;
}
}
if(o == OMUL) {
if(l->addable >= INDEXED) {
t = l;
l = r;
r = t;
}
/* should favour AX */
regalloc(&nod, l, nn);
cgen(l, &nod);
if(r->addable < INDEXED || hardconst(r)) {
regalloc(&nod1, r, Z);
cgen(r, &nod1);
gopcode(OMUL, n->type, &nod1, &nod);
regfree(&nod1);
}else
gopcode(OMUL, n->type, r, &nod); /* addressible */
gmove(&nod, nn);
regfree(&nod);
break;
}
/*
* get nod to be D_AX
* get nod1 to be D_DX
*/
if(nodreg(&nod, nn, D_AX)) {
regsalloc(&nod2, n);
gmove(&nod, &nod2);
v = reg[D_AX];
reg[D_AX] = 0;
if(isreg(l, D_AX)) {
nod3 = *n;
nod3.left = &nod2;
cgen(&nod3, nn);
} else
if(isreg(r, D_AX)) {
nod3 = *n;
nod3.right = &nod2;
cgen(&nod3, nn);
} else
cgen(n, nn);
gmove(&nod2, &nod);
reg[D_AX] = v;
break;
}
if(nodreg(&nod1, nn, D_DX)) {
regsalloc(&nod2, n);
gmove(&nod1, &nod2);
v = reg[D_DX];
reg[D_DX] = 0;
if(isreg(l, D_DX)) {
nod3 = *n;
nod3.left = &nod2;
cgen(&nod3, nn);
} else
if(isreg(r, D_DX)) {
nod3 = *n;
nod3.right = &nod2;
cgen(&nod3, nn);
} else
cgen(n, nn);
gmove(&nod2, &nod1);
reg[D_DX] = v;
break;
}
reg[D_AX]++;
if(r->op == OCONST && (o == ODIV || o == OLDIV) && immconst(r) && typechl[r->type->etype]) {
reg[D_DX]++;
if(l->addable < INDEXED) {
regalloc(&nod2, l, Z);
cgen(l, &nod2);
l = &nod2;
}
if(o == ODIV)
sdivgen(l, r, &nod, &nod1);
else
udivgen(l, r, &nod, &nod1);
gmove(&nod1, nn);
if(l == &nod2)
regfree(l);
goto freeaxdx;
}
if(l->complex >= r->complex) {
cgen(l, &nod);
reg[D_DX]++;
if(o == ODIV || o == OMOD)
gins(typechl[l->type->etype]? ACDQ: ACQO, Z, Z);
if(o == OLDIV || o == OLMOD)
zeroregm(&nod1);
if(r->addable < INDEXED || r->op == OCONST) {
regsalloc(&nod3, r);
cgen(r, &nod3);
gopcode(o, n->type, &nod3, Z);
} else
gopcode(o, n->type, r, Z);
} else {
regsalloc(&nod3, r);
cgen(r, &nod3);
cgen(l, &nod);
reg[D_DX]++;
if(o == ODIV || o == OMOD)
gins(typechl[l->type->etype]? ACDQ: ACQO, Z, Z);
if(o == OLDIV || o == OLMOD)
zeroregm(&nod1);
gopcode(o, n->type, &nod3, Z);
}
if(o == OMOD || o == OLMOD)
gmove(&nod1, nn);
else
gmove(&nod, nn);
freeaxdx:
regfree(&nod);
regfree(&nod1);
break;
case OASLSHR:
case OASASHL:
case OASASHR:
if(r->op == OCONST)
goto asand;
if(l->op == OBIT)
goto asbitop;
if(typefd[n->type->etype])
goto asand; /* can this happen? */
/*
* get nod to be D_CX
*/
if(nodreg(&nod, nn, D_CX)) {
regsalloc(&nod1, n);
gmove(&nod, &nod1);
cgen(n, &nod);
if(nn != Z)
gmove(&nod, nn);
gmove(&nod1, &nod);
break;
}
reg[D_CX]++;
if(r->complex >= l->complex) {
cgen(r, &nod);
if(hardleft)
reglcgen(&nod1, l, Z);
else
nod1 = *l;
} else {
if(hardleft)
reglcgen(&nod1, l, Z);
else
nod1 = *l;
cgen(r, &nod);
}
gopcode(o, l->type, &nod, &nod1);
regfree(&nod);
if(nn != Z)
gmove(&nod1, nn);
if(hardleft)
regfree(&nod1);
break;
case OASAND:
case OASADD:
case OASSUB:
case OASXOR:
case OASOR:
asand:
if(l->op == OBIT)
goto asbitop;
if(typefd[l->type->etype] || typefd[r->type->etype])
goto asfop;
if(l->complex >= r->complex) {
if(hardleft)
reglcgen(&nod, l, Z);
else
nod = *l;
if(!immconst(r)) {
regalloc(&nod1, r, nn);
cgen(r, &nod1);
gopcode(o, l->type, &nod1, &nod);
regfree(&nod1);
} else
gopcode(o, l->type, r, &nod);
} else {
regalloc(&nod1, r, nn);
cgen(r, &nod1);
if(hardleft)
reglcgen(&nod, l, Z);
else
nod = *l;
gopcode(o, l->type, &nod1, &nod);
regfree(&nod1);
}
if(nn != Z)
gmove(&nod, nn);
if(hardleft)
regfree(&nod);
break;
asfop:
if(l->complex >= r->complex) {
if(hardleft)
reglcgen(&nod, l, Z);
else
nod = *l;
if(r->addable < INDEXED){
regalloc(&nod1, r, nn);
cgen(r, &nod1);
}else
nod1 = *r;
regalloc(&nod2, r, Z);
gmove(&nod, &nod2);
gopcode(o, r->type, &nod1, &nod2);
gmove(&nod2, &nod);
regfree(&nod2);
if(r->addable < INDEXED)
regfree(&nod1);
} else {
regalloc(&nod1, r, nn);
cgen(r, &nod1);
if(hardleft)
reglcgen(&nod, l, Z);
else
nod = *l;
if(o != OASMUL && o != OASADD) {
regalloc(&nod2, r, Z);
gmove(&nod, &nod2);
gopcode(o, r->type, &nod1, &nod2);
regfree(&nod1);
gmove(&nod2, &nod);
regfree(&nod2);
} else {
gopcode(o, r->type, &nod, &nod1);
gmove(&nod1, &nod);
regfree(&nod1);
}
}
if(nn != Z)
gmove(&nod, nn);
if(hardleft)
regfree(&nod);
break;
case OASLMUL:
case OASLDIV:
case OASLMOD:
case OASMUL:
case OASDIV:
case OASMOD:
if(l->op == OBIT)
goto asbitop;
if(typefd[n->type->etype] || typefd[r->type->etype])
goto asfop;
if(r->op == OCONST && typechl[n->type->etype]) {
SET(v);
switch(o) {
case OASDIV:
case OASMOD:
c = r->vconst;
if(c < 0)
c = -c;
v = xlog2(c);
if(v < 0)
break;
/* fall thru */
case OASMUL:
case OASLMUL:
if(hardleft)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
regalloc(&nod, l, nn);
cgen(&nod2, &nod);
switch(o) {
case OASMUL:
case OASLMUL:
mulgen(n->type, r, &nod);
break;
case OASDIV:
sdiv2(r->vconst, v, l, &nod);
break;
case OASMOD:
smod2(r->vconst, v, l, &nod);
break;
}
havev:
gmove(&nod, &nod2);
if(nn != Z)
gmove(&nod, nn);
if(hardleft)
regfree(&nod2);
regfree(&nod);
goto done;
case OASLDIV:
c = r->vconst;
if((c & 0x80000000) == 0)
break;
if(hardleft)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
regalloc(&nod1, l, nn);
cgen(&nod2, &nod1);
regalloc(&nod, l, nn);
zeroregm(&nod);
gins(ACMPL, &nod1, nodconst(c));
gins(ASBBL, nodconst(-1), &nod);
regfree(&nod1);
goto havev;
}
}
if(o == OASMUL) {
/* should favour AX */
regalloc(&nod, l, nn);
if(r->complex >= FNX) {
regalloc(&nod1, r, Z);
cgen(r, &nod1);
r = &nod1;
}
if(hardleft)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
cgen(&nod2, &nod);
if(r->addable < INDEXED || hardconst(r)) {
if(r->complex < FNX) {
regalloc(&nod1, r, Z);
cgen(r, &nod1);
}
gopcode(OASMUL, n->type, &nod1, &nod);
regfree(&nod1);
}
else
gopcode(OASMUL, n->type, r, &nod);
if(r == &nod1)
regfree(r);
gmove(&nod, &nod2);
if(nn != Z)
gmove(&nod, nn);
regfree(&nod);
if(hardleft)
regfree(&nod2);
break;
}
/*
* get nod to be D_AX
* get nod1 to be D_DX
*/
if(nodreg(&nod, nn, D_AX)) {
regsalloc(&nod2, n);
gmove(&nod, &nod2);
v = reg[D_AX];
reg[D_AX] = 0;
if(isreg(l, D_AX)) {
nod3 = *n;
nod3.left = &nod2;
cgen(&nod3, nn);
} else
if(isreg(r, D_AX)) {
nod3 = *n;
nod3.right = &nod2;
cgen(&nod3, nn);
} else
cgen(n, nn);
gmove(&nod2, &nod);
reg[D_AX] = v;
break;
}
if(nodreg(&nod1, nn, D_DX)) {
regsalloc(&nod2, n);
gmove(&nod1, &nod2);
v = reg[D_DX];
reg[D_DX] = 0;
if(isreg(l, D_DX)) {
nod3 = *n;
nod3.left = &nod2;
cgen(&nod3, nn);
} else
if(isreg(r, D_DX)) {
nod3 = *n;
nod3.right = &nod2;
cgen(&nod3, nn);
} else
cgen(n, nn);
gmove(&nod2, &nod1);
reg[D_DX] = v;
break;
}
reg[D_AX]++;
reg[D_DX]++;
if(l->complex >= r->complex) {
if(hardleft)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
cgen(&nod2, &nod);
if(r->op == OCONST && typechl[r->type->etype]) {
switch(o) {
case OASDIV:
sdivgen(&nod2, r, &nod, &nod1);
goto divdone;
case OASLDIV:
udivgen(&nod2, r, &nod, &nod1);
divdone:
gmove(&nod1, &nod2);
if(nn != Z)
gmove(&nod1, nn);
goto freelxaxdx;
}
}
if(o == OASDIV || o == OASMOD)
gins(typechl[l->type->etype]? ACDQ: ACQO, Z, Z);
if(o == OASLDIV || o == OASLMOD)
zeroregm(&nod1);
if(r->addable < INDEXED || r->op == OCONST ||
!typeil[r->type->etype]) {
regalloc(&nod3, r, Z);
cgen(r, &nod3);
gopcode(o, l->type, &nod3, Z);
regfree(&nod3);
} else
gopcode(o, n->type, r, Z);
} else {
regalloc(&nod3, r, Z);
cgen(r, &nod3);
if(hardleft)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
cgen(&nod2, &nod);
if(o == OASDIV || o == OASMOD)
gins(typechl[l->type->etype]? ACDQ: ACQO, Z, Z);
if(o == OASLDIV || o == OASLMOD)
zeroregm(&nod1);
gopcode(o, l->type, &nod3, Z);
regfree(&nod3);
}
if(o == OASMOD || o == OASLMOD) {
gmove(&nod1, &nod2);
if(nn != Z)
gmove(&nod1, nn);
} else {
gmove(&nod, &nod2);
if(nn != Z)
gmove(&nod, nn);
}
freelxaxdx:
if(hardleft)
regfree(&nod2);
regfree(&nod);
regfree(&nod1);
break;
fop:
if(l->complex >= r->complex) {
regalloc(&nod, l, nn);
cgen(l, &nod);
if(r->addable < INDEXED) {
regalloc(&nod1, r, Z);
cgen(r, &nod1);
gopcode(o, n->type, &nod1, &nod);
regfree(&nod1);
} else
gopcode(o, n->type, r, &nod);
} else {
/* TO DO: could do better with r->addable >= INDEXED */
regalloc(&nod1, r, Z);
cgen(r, &nod1);
regalloc(&nod, l, nn);
cgen(l, &nod);
gopcode(o, n->type, &nod1, &nod);
regfree(&nod1);
}
gmove(&nod, nn);
regfree(&nod);
break;
asbitop:
regalloc(&nod4, n, nn);
if(l->complex >= r->complex) {
bitload(l, &nod, &nod1, &nod2, &nod4);
regalloc(&nod3, r, Z);
cgen(r, &nod3);
} else {
regalloc(&nod3, r, Z);
cgen(r, &nod3);
bitload(l, &nod, &nod1, &nod2, &nod4);
}
gmove(&nod, &nod4);
{ /* TO DO: check floating point source */
Node onod;
/* incredible grot ... */
onod = nod3;
onod.op = o;
onod.complex = 2;
onod.addable = 0;
onod.type = tfield;
onod.left = &nod4;
onod.right = &nod3;
cgen(&onod, Z);
}
regfree(&nod3);
gmove(&nod4, &nod);
regfree(&nod4);
bitstore(l, &nod, &nod1, &nod2, nn);
break;
case OADDR:
if(nn == Z) {
nullwarn(l, Z);
break;
}
lcgen(l, nn);
break;
case OFUNC:
if(l->complex >= FNX) {
if(l->op != OIND)
diag(n, "bad function call");
regret(&nod, l->left);
cgen(l->left, &nod);
regsalloc(&nod1, l->left);
gmove(&nod, &nod1);
regfree(&nod);
nod = *n;
nod.left = &nod2;
nod2 = *l;
nod2.left = &nod1;
nod2.complex = 1;
cgen(&nod, nn);
return;
}
o = 0;
if(REGARG >= 0)
o = reg[REGARG];
gargs(r, &nod, &nod1);
if(l->addable < INDEXED) {
reglcgen(&nod, l, nn);
nod.op = OREGISTER;
gopcode(OFUNC, n->type, Z, &nod);
regfree(&nod);
} else
gopcode(OFUNC, n->type, Z, l);
if(REGARG >= 0)
if(o != reg[REGARG])
reg[REGARG]--;
if(nn != Z) {
regret(&nod, n);
gmove(&nod, nn);
regfree(&nod);
}
break;
case OIND:
if(nn == Z) {
nullwarn(l, Z);
break;
}
regialloc(&nod, n, nn);
r = l;
while(r->op == OADD)
r = r->right;
if(sconst(r)) {
v = r->vconst;
r->vconst = 0;
cgen(l, &nod);
nod.xoffset += v;
r->vconst = v;
} else
cgen(l, &nod);
regind(&nod, n);
gmove(&nod, nn);
regfree(&nod);
break;
case OEQ:
case ONE:
case OLE:
case OLT:
case OGE:
case OGT:
case OLO:
case OLS:
case OHI:
case OHS:
if(nn == Z) {
nullwarn(l, r);
break;
}
boolgen(n, 1, nn);
break;
case OANDAND:
case OOROR:
boolgen(n, 1, nn);
if(nn == Z)
patch(p, pc);
break;
case ONOT:
if(nn == Z) {
nullwarn(l, Z);
break;
}
boolgen(n, 1, nn);
break;
case OCOMMA:
cgen(l, Z);
cgen(r, nn);
break;
case OCAST:
if(nn == Z) {
nullwarn(l, Z);
break;
}
/*
* convert from types l->n->nn
*/
if(nocast(l->type, n->type) && nocast(n->type, nn->type)) {
/* both null, gen l->nn */
cgen(l, nn);
break;
}
if(ewidth[n->type->etype] < ewidth[l->type->etype]){
if(l->type->etype == TIND && typechlp[n->type->etype])
warn(n, "conversion of pointer to shorter integer");
}else if(0){
if(nocast(n->type, nn->type) || castup(n->type, nn->type)){
if(typefd[l->type->etype] != typefd[nn->type->etype])
regalloc(&nod, l, nn);
else
regalloc(&nod, nn, nn);
cgen(l, &nod);
gmove(&nod, nn);
regfree(&nod);
break;
}
}
regalloc(&nod, l, nn);
cgen(l, &nod);
regalloc(&nod1, n, &nod);
gmove(&nod, &nod1);
gmove(&nod1, nn);
regfree(&nod1);
regfree(&nod);
break;
case ODOT:
sugen(l, nodrat, l->type->width);
if(nn == Z)
break;
warn(n, "non-interruptable temporary");
nod = *nodrat;
if(!r || r->op != OCONST) {
diag(n, "DOT and no offset");
break;
}
nod.xoffset += (int32)r->vconst;
nod.type = n->type;
cgen(&nod, nn);
break;
case OCOND:
bcgen(l, 1);
p1 = p;
cgen(r->left, nn);
gbranch(OGOTO);
patch(p1, pc);
p1 = p;
cgen(r->right, nn);
patch(p1, pc);
break;
case OPOSTINC:
case OPOSTDEC:
v = 1;
if(l->type->etype == TIND)
v = l->type->link->width;
if(o == OPOSTDEC)
v = -v;
if(l->op == OBIT)
goto bitinc;
if(nn == Z)
goto pre;
if(hardleft)
reglcgen(&nod, l, Z);
else
nod = *l;
gmove(&nod, nn);
if(typefd[n->type->etype]) {
regalloc(&nod1, l, Z);
gmove(&nod, &nod1);
if(v < 0)
gopcode(OSUB, n->type, nodfconst(-v), &nod1);
else
gopcode(OADD, n->type, nodfconst(v), &nod1);
gmove(&nod1, &nod);
regfree(&nod1);
} else
gopcode(OADD, n->type, nodconst(v), &nod);
if(hardleft)
regfree(&nod);
break;
case OPREINC:
case OPREDEC:
v = 1;
if(l->type->etype == TIND)
v = l->type->link->width;
if(o == OPREDEC)
v = -v;
if(l->op == OBIT)
goto bitinc;
pre:
if(hardleft)
reglcgen(&nod, l, Z);
else
nod = *l;
if(typefd[n->type->etype]) {
regalloc(&nod1, l, Z);
gmove(&nod, &nod1);
if(v < 0)
gopcode(OSUB, n->type, nodfconst(-v), &nod1);
else
gopcode(OADD, n->type, nodfconst(v), &nod1);
gmove(&nod1, &nod);
regfree(&nod1);
} else
gopcode(OADD, n->type, nodconst(v), &nod);
if(nn != Z)
gmove(&nod, nn);
if(hardleft)
regfree(&nod);
break;
bitinc:
if(nn != Z && (o == OPOSTINC || o == OPOSTDEC)) {
bitload(l, &nod, &nod1, &nod2, Z);
gmove(&nod, nn);
gopcode(OADD, tfield, nodconst(v), &nod);
bitstore(l, &nod, &nod1, &nod2, Z);
break;
}
bitload(l, &nod, &nod1, &nod2, nn);
gopcode(OADD, tfield, nodconst(v), &nod);
bitstore(l, &nod, &nod1, &nod2, nn);
break;
}
done:
cursafe = curs;
}
void
udivgen(Node *l, Node *r, Node *ax, Node *dx)
{
int a, s, t;
uint32 m;
Node nod;
a = udiv(r->vconst, &m, &s, &t);
//print("a=%ud i=%ld p=%d s=%d m=%lux\n", a, (int32)r->vconst, t, s, m);
if(t != 0) {
gins(AMOVL, l, ax);
gins(ASHRL, nodconst(t), ax);
gins(AMOVL, nodconst(m), dx);
gins(AMULL, dx, Z);
}
else if(a) {
if(l->op != OREGISTER) {
regalloc(&nod, l, Z);
gins(AMOVL, l, &nod);
l = &nod;
}
gins(AMOVL, nodconst(m), ax);
gins(AMULL, l, Z);
gins(AADDL, l, dx);
gins(ARCRL, nodconst(1), dx);
if(l == &nod)
regfree(l);
}
else {
gins(AMOVL, nodconst(m), ax);
gins(AMULL, l, Z);
}
if(s != 0)
gins(ASHRL, nodconst(s), dx);
}
void
gdata(Node *nam, Node *nr, int wid)
{
Prog *p;
vlong v;
if(wid == 8 && is64(nr->type)) {
v = mpgetfix(nr->val.u.xval);
p = gins(ADATA, nam, nodintconst(v));
p->reg = 4;
p = gins(ADATA, nam, nodintconst(v>>32));
p->reg = 4;
p->from.offset += 4;
return;
}
p = gins(ADATA, nam, nr);
p->reg = wid;
}
void
gdatacomplex(Node *nam, Mpcplx *cval)
{
Prog *p;
int w;
w = cplxsubtype(nam->type->etype);
w = types[w]->width;
p = gins(ADATA, nam, N);
p->reg = w;
p->to.type = D_FCONST;
/*
* generate comparison of nl, nr, both 64-bit.
* nl is memory; nr is constant or memory.
*/
void
cmp64(Node *nl, Node *nr, int op, Prog *to)
{
Node lo1, hi1, lo2, hi2, r1, r2;
Prog *br;
Type *t;
split64(nl, &lo1, &hi1);
split64(nr, &lo2, &hi2);
// compare most significant word;
// if they differ, we're done.
t = hi1.type;
regalloc(&r1, types[TINT32], N);
regalloc(&r2, types[TINT32], N);
gins(AMOVW, &hi1, &r1);
gins(AMOVW, &hi2, &r2);
gcmp(ACMP, &r1, &r2);
regfree(&r1);
regfree(&r2);
br = P;
switch(op) {
default:
fatal("cmp64 %O %T", op, t);
case OEQ:
// cmp hi
// bne L
// cmp lo
// beq to
// L:
br = gbranch(ABNE, T);
break;
case ONE:
// cmp hi
// bne to
// cmp lo
// bne to
patch(gbranch(ABNE, T), to);
break;
case OGE:
case OGT:
// cmp hi
// bgt to
// blt L
// cmp lo
// bge to (or bgt to)
// L:
patch(gbranch(optoas(OGT, t), T), to);
br = gbranch(optoas(OLT, t), T);
break;
case OLE:
case OLT:
// cmp hi
// blt to
// bgt L
// cmp lo
// ble to (or jlt to)
// L:
patch(gbranch(optoas(OLT, t), T), to);
br = gbranch(optoas(OGT, t), T);
break;
}
// compare least significant word
t = lo1.type;
regalloc(&r1, types[TINT32], N);
regalloc(&r2, types[TINT32], N);
gins(AMOVW, &lo1, &r1);
gins(AMOVW, &lo2, &r2);
gcmp(ACMP, &r1, &r2);
regfree(&r1);
regfree(&r2);
// jump again
patch(gbranch(optoas(op, t), T), to);
// point first branch down here if appropriate
if(br != P)
patch(br, pc);
splitclean();
splitclean();
}
/*
* generate:
* res = &n;
*/
void
agen(Node *n, Node *res)
{
Node *nl, *nr;
Node n1, n2, n3, tmp, n4;
Prog *p1;
uint32 w;
uint64 v;
Type *t;
if(debug['g']) {
dump("\nagen-res", res);
dump("agen-r", n);
}
if(n == N || n->type == T)
return;
if(!isptr[res->type->etype])
fatal("agen: not tptr: %T", res->type);
while(n->op == OCONVNOP)
n = n->left;
if(n->addable) {
regalloc(&n1, types[tptr], res);
gins(ALEAQ, n, &n1);
gmove(&n1, res);
regfree(&n1);
goto ret;
}
nl = n->left;
nr = n->right;
switch(n->op) {
default:
fatal("agen: unknown op %N", n);
break;
case OCALLMETH:
cgen_callmeth(n, 0);
cgen_aret(n, res);
break;
case OCALLINTER:
cgen_callinter(n, res, 0);
cgen_aret(n, res);
break;
case OCALLFUNC:
cgen_call(n, 0);
cgen_aret(n, res);
break;
case OINDEX:
w = n->type->width;
if(nr->addable)
goto irad;
if(nl->addable) {
if(!isconst(nr, CTINT)) {
regalloc(&n1, nr->type, N);
cgen(nr, &n1);
}
regalloc(&n3, types[tptr], res);
agen(nl, &n3);
goto index;
}
tempname(&tmp, nr->type);
cgen(nr, &tmp);
nr = &tmp;
irad:
regalloc(&n3, types[tptr], res);
agen(nl, &n3);
if(!isconst(nr, CTINT)) {
regalloc(&n1, nr->type, N);
cgen(nr, &n1);
}
goto index;
index:
// &a is in &n3 (allocated in res)
// i is in &n1 (if not constant)
// w is width
// explicit check for nil if array is large enough
// that we might derive too big a pointer.
if(!isslice(nl->type) && nl->type->width >= unmappedzero) {
regalloc(&n4, types[tptr], &n3);
gmove(&n3, &n4);
n4.op = OINDREG;
n4.type = types[TUINT8];
n4.xoffset = 0;
gins(ATESTB, nodintconst(0), &n4);
regfree(&n4);
}
if(w == 0)
fatal("index is zero width");
// constant index
if(isconst(nr, CTINT)) {
v = mpgetfix(nr->val.u.xval);
if(isslice(nl->type)) {
if(!debug['B'] && !n->etype) {
n1 = n3;
n1.op = OINDREG;
n1.type = types[tptr];
n1.xoffset = Array_nel;
nodconst(&n2, types[TUINT64], v);
gins(optoas(OCMP, types[TUINT32]), &n1, &n2);
p1 = gbranch(optoas(OGT, types[TUINT32]), T);
ginscall(throwindex, 0);
patch(p1, pc);
}
n1 = n3;
n1.op = OINDREG;
n1.type = types[tptr];
n1.xoffset = Array_array;
gmove(&n1, &n3);
} else
if(!debug['B'] && !n->etype) {
if(v < 0)
yyerror("out of bounds on array");
else
if(v >= nl->type->bound)
yyerror("out of bounds on array");
}
nodconst(&n2, types[tptr], v*w);
gins(optoas(OADD, types[tptr]), &n2, &n3);
gmove(&n3, res);
regfree(&n3);
break;
}
// type of the index
t = types[TUINT64];
if(issigned[n1.type->etype])
t = types[TINT64];
regalloc(&n2, t, &n1); // i
gmove(&n1, &n2);
regfree(&n1);
if(!debug['B'] && !n->etype) {
// check bounds
if(isslice(nl->type)) {
n1 = n3;
n1.op = OINDREG;
n1.type = types[tptr];
n1.xoffset = Array_nel;
} else
nodconst(&n1, types[TUINT64], nl->type->bound);
gins(optoas(OCMP, types[TUINT32]), &n2, &n1);
p1 = gbranch(optoas(OLT, types[TUINT32]), T);
ginscall(throwindex, 0);
patch(p1, pc);
}
if(isslice(nl->type)) {
n1 = n3;
n1.op = OINDREG;
n1.type = types[tptr];
n1.xoffset = Array_array;
gmove(&n1, &n3);
}
if(w == 1 || w == 2 || w == 4 || w == 8) {
p1 = gins(ALEAQ, &n2, &n3);
p1->from.scale = w;
p1->from.index = p1->from.type;
p1->from.type = p1->to.type + D_INDIR;
} else {
nodconst(&n1, t, w);
gins(optoas(OMUL, t), &n1, &n2);
gins(optoas(OADD, types[tptr]), &n2, &n3);
gmove(&n3, res);
}
gmove(&n3, res);
regfree(&n2);
regfree(&n3);
break;
case ONAME:
// should only get here with names in this func.
if(n->funcdepth > 0 && n->funcdepth != funcdepth) {
dump("bad agen", n);
fatal("agen: bad ONAME funcdepth %d != %d",
n->funcdepth, funcdepth);
}
// should only get here for heap vars or paramref
if(!(n->class & PHEAP) && n->class != PPARAMREF) {
dump("bad agen", n);
fatal("agen: bad ONAME class %#x", n->class);
}
cgen(n->heapaddr, res);
if(n->xoffset != 0) {
nodconst(&n1, types[TINT64], n->xoffset);
gins(optoas(OADD, types[tptr]), &n1, res);
}
break;
case OIND:
cgen(nl, res);
break;
case ODOT:
agen(nl, res);
if(n->xoffset != 0) {
nodconst(&n1, types[TINT64], n->xoffset);
gins(optoas(OADD, types[tptr]), &n1, res);
}
break;
case ODOTPTR:
cgen(nl, res);
if(n->xoffset != 0) {
// explicit check for nil if struct is large enough
// that we might derive too big a pointer.
if(nl->type->type->width >= unmappedzero) {
regalloc(&n1, types[tptr], res);
gmove(res, &n1);
n1.op = OINDREG;
n1.type = types[TUINT8];
n1.xoffset = 0;
gins(ATESTB, nodintconst(0), &n1);
regfree(&n1);
}
nodconst(&n1, types[TINT64], n->xoffset);
gins(optoas(OADD, types[tptr]), &n1, res);
}
break;
}
ret:
;
}
/*
* make a refer to the data s, s+len
* emitting DATA if needed.
*/
void
datastring(char *s, int len, Addr *a)
{
int w;
Prog *p;
Addr ac, ao;
static int gen;
struct {
Strlit lit;
char buf[100];
} tmp;
// string
memset(&ao, 0, sizeof(ao));
ao.type = D_OREG;
ao.name = D_STATIC;
ao.etype = TINT32;
ao.offset = 0; // fill in
ao.reg = NREG;
// constant
memset(&ac, 0, sizeof(ac));
ac.type = D_CONST;
ac.name = D_NONE;
ac.offset = 0; // fill in
ac.reg = NREG;
// huge strings are made static to avoid long names.
if(len > 100) {
snprint(namebuf, sizeof(namebuf), ".string.%d", gen++);
ao.sym = lookup(namebuf);
ao.name = D_STATIC;
} else {
if(len > 0 && s[len-1] == '\0')
len--;
tmp.lit.len = len;
memmove(tmp.lit.s, s, len);
tmp.lit.s[len] = '\0';
len++;
snprint(namebuf, sizeof(namebuf), "\"%Z\"", &tmp.lit);
ao.sym = pkglookup(namebuf, stringpkg);
ao.name = D_EXTERN;
}
*a = ao;
// only generate data the first time.
if(ao.sym->flags & SymUniq)
return;
ao.sym->flags |= SymUniq;
data();
for(w=0; w<len; w+=8) {
p = pc;
gins(ADATA, N, N);
// DATA s+w, [NSNAME], $"xxx"
p->from = ao;
p->from.offset = w;
p->reg = NSNAME;
if(w+8 > len)
p->reg = len-w;
p->to = ac;
p->to.type = D_SCONST;
p->to.offset = len;
memmove(p->to.sval, s+w, p->reg);
}
p = pc;
ggloblsym(ao.sym, len, ao.name == D_EXTERN);
if(ao.name == D_STATIC)
p->from.name = D_STATIC;
text();
}
/*
* attempt to generate 64-bit
* res = n
* return 1 on success, 0 if op not handled.
*/
void
cgen64(Node *n, Node *res)
{
Node t1, t2, *l, *r;
Node lo1, lo2, hi1, hi2;
Node al, ah, bl, bh, cl, ch, s, n1, creg;
Prog *p1, *p2, *p3, *p4, *p5, *p6;
uint64 v;
if(res->op != OINDREG && res->op != ONAME) {
dump("n", n);
dump("res", res);
fatal("cgen64 %O of %O", n->op, res->op);
}
l = n->left;
if(!l->addable) {
tempname(&t1, l->type);
cgen(l, &t1);
l = &t1;
}
split64(l, &lo1, &hi1);
switch(n->op) {
default:
fatal("cgen64 %O", n->op);
case OMINUS:
split64(res, &lo2, &hi2);
regalloc(&t1, lo1.type, N);
regalloc(&al, lo1.type, N);
regalloc(&ah, hi1.type, N);
gins(AMOVW, &lo1, &al);
gins(AMOVW, &hi1, &ah);
gmove(ncon(0), &t1);
p1 = gins(ASUB, &al, &t1);
p1->scond |= C_SBIT;
gins(AMOVW, &t1, &lo2);
gmove(ncon(0), &t1);
gins(ASBC, &ah, &t1);
gins(AMOVW, &t1, &hi2);
regfree(&t1);
regfree(&al);
regfree(&ah);
splitclean();
splitclean();
return;
case OCOM:
split64(res, &lo2, &hi2);
regalloc(&n1, lo1.type, N);
gins(AMOVW, &lo1, &n1);
gins(AMVN, &n1, &n1);
gins(AMOVW, &n1, &lo2);
gins(AMOVW, &hi1, &n1);
gins(AMVN, &n1, &n1);
gins(AMOVW, &n1, &hi2);
regfree(&n1);
splitclean();
splitclean();
return;
case OADD:
case OSUB:
case OMUL:
case OLSH:
case ORSH:
case OAND:
case OOR:
case OXOR:
// binary operators.
// common setup below.
break;
}
// setup for binary operators
r = n->right;
if(r != N && !r->addable) {
tempname(&t2, r->type);
cgen(r, &t2);
r = &t2;
}
if(is64(r->type))
split64(r, &lo2, &hi2);
regalloc(&al, lo1.type, N);
regalloc(&ah, hi1.type, N);
// Do op. Leave result in ah:al.
switch(n->op) {
default:
fatal("cgen64: not implemented: %N\n", n);
case OADD:
// TODO: Constants
regalloc(&bl, types[TPTR32], N);
regalloc(&bh, types[TPTR32], N);
gins(AMOVW, &hi1, &ah);
gins(AMOVW, &lo1, &al);
gins(AMOVW, &hi2, &bh);
gins(AMOVW, &lo2, &bl);
p1 = gins(AADD, &bl, &al);
p1->scond |= C_SBIT;
gins(AADC, &bh, &ah);
regfree(&bl);
regfree(&bh);
break;
case OSUB:
// TODO: Constants.
regalloc(&bl, types[TPTR32], N);
regalloc(&bh, types[TPTR32], N);
gins(AMOVW, &lo1, &al);
gins(AMOVW, &hi1, &ah);
gins(AMOVW, &lo2, &bl);
gins(AMOVW, &hi2, &bh);
p1 = gins(ASUB, &bl, &al);
p1->scond |= C_SBIT;
gins(ASBC, &bh, &ah);
regfree(&bl);
regfree(&bh);
break;
case OMUL:
// TODO(kaib): this can be done with 4 regs and does not need 6
regalloc(&bl, types[TPTR32], N);
regalloc(&bh, types[TPTR32], N);
regalloc(&cl, types[TPTR32], N);
regalloc(&ch, types[TPTR32], N);
// load args into bh:bl and bh:bl.
gins(AMOVW, &hi1, &bh);
gins(AMOVW, &lo1, &bl);
gins(AMOVW, &hi2, &ch);
gins(AMOVW, &lo2, &cl);
// bl * cl
p1 = gins(AMULLU, N, N);
p1->from.type = D_REG;
p1->from.reg = bl.val.u.reg;
p1->reg = cl.val.u.reg;
p1->to.type = D_REGREG;
p1->to.reg = ah.val.u.reg;
p1->to.offset = al.val.u.reg;
//print("%P\n", p1);
// bl * ch
p1 = gins(AMULA, N, N);
p1->from.type = D_REG;
p1->from.reg = bl.val.u.reg;
p1->reg = ch.val.u.reg;
p1->to.type = D_REGREG;
p1->to.reg = ah.val.u.reg;
p1->to.offset = ah.val.u.reg;
//print("%P\n", p1);
// bh * cl
p1 = gins(AMULA, N, N);
p1->from.type = D_REG;
p1->from.reg = bh.val.u.reg;
p1->reg = cl.val.u.reg;
p1->to.type = D_REGREG;
p1->to.reg = ah.val.u.reg;
p1->to.offset = ah.val.u.reg;
//print("%P\n", p1);
regfree(&bh);
regfree(&bl);
regfree(&ch);
regfree(&cl);
break;
case OLSH:
regalloc(&bl, lo1.type, N);
regalloc(&bh, hi1.type, N);
gins(AMOVW, &hi1, &bh);
gins(AMOVW, &lo1, &bl);
if(r->op == OLITERAL) {
v = mpgetfix(r->val.u.xval);
if(v >= 64) {
// TODO(kaib): replace with gins(AMOVW, nodintconst(0), &al)
// here and below (verify it optimizes to EOR)
gins(AEOR, &al, &al);
gins(AEOR, &ah, &ah);
} else if(v > 32) {
gins(AEOR, &al, &al);
// MOVW bl<<(v-32), ah
gshift(AMOVW, &bl, SHIFT_LL, (v-32), &ah);
} else if(v == 32) {
gins(AEOR, &al, &al);
gins(AMOVW, &bl, &ah);
} else if(v > 0) {
// MOVW bl<<v, al
gshift(AMOVW, &bl, SHIFT_LL, v, &al);
// MOVW bh<<v, ah
gshift(AMOVW, &bh, SHIFT_LL, v, &ah);
// OR bl>>(32-v), ah
gshift(AORR, &bl, SHIFT_LR, 32-v, &ah);
} else {
gins(AMOVW, &bl, &al);
gins(AMOVW, &bh, &ah);
}
goto olsh_break;
}
regalloc(&s, types[TUINT32], N);
regalloc(&creg, types[TUINT32], N);
if (is64(r->type)) {
// shift is >= 1<<32
split64(r, &cl, &ch);
gmove(&ch, &s);
p1 = gins(AMOVW, &s, &s);
p1->scond |= C_SBIT;
p6 = gbranch(ABNE, T);
gmove(&cl, &s);
splitclean();
} else {
gmove(r, &s);
p6 = P;
}
p1 = gins(AMOVW, &s, &s);
p1->scond |= C_SBIT;
// shift == 0
p1 = gins(AMOVW, &bl, &al);
p1->scond = C_SCOND_EQ;
p1 = gins(AMOVW, &bh, &ah);
p1->scond = C_SCOND_EQ;
p2 = gbranch(ABEQ, T);
// shift is < 32
nodconst(&n1, types[TUINT32], 32);
gmove(&n1, &creg);
gcmp(ACMP, &s, &creg);
// MOVW.LO bl<<s, al
p1 = gregshift(AMOVW, &bl, SHIFT_LL, &s, &al);
p1->scond = C_SCOND_LO;
// MOVW.LO bh<<s, ah
p1 = gregshift(AMOVW, &bh, SHIFT_LL, &s, &ah);
p1->scond = C_SCOND_LO;
// SUB.LO s, creg
p1 = gins(ASUB, &s, &creg);
p1->scond = C_SCOND_LO;
// OR.LO bl>>creg, ah
p1 = gregshift(AORR, &bl, SHIFT_LR, &creg, &ah);
p1->scond = C_SCOND_LO;
// BLO end
p3 = gbranch(ABLO, T);
// shift == 32
p1 = gins(AEOR, &al, &al);
p1->scond = C_SCOND_EQ;
p1 = gins(AMOVW, &bl, &ah);
p1->scond = C_SCOND_EQ;
p4 = gbranch(ABEQ, T);
// shift is < 64
nodconst(&n1, types[TUINT32], 64);
gmove(&n1, &creg);
gcmp(ACMP, &s, &creg);
// EOR.LO al, al
p1 = gins(AEOR, &al, &al);
p1->scond = C_SCOND_LO;
// MOVW.LO creg>>1, creg
p1 = gshift(AMOVW, &creg, SHIFT_LR, 1, &creg);
p1->scond = C_SCOND_LO;
// SUB.LO creg, s
p1 = gins(ASUB, &creg, &s);
p1->scond = C_SCOND_LO;
// MOVW bl<<s, ah
p1 = gregshift(AMOVW, &bl, SHIFT_LL, &s, &ah);
p1->scond = C_SCOND_LO;
p5 = gbranch(ABLO, T);
// shift >= 64
if (p6 != P) patch(p6, pc);
gins(AEOR, &al, &al);
gins(AEOR, &ah, &ah);
patch(p2, pc);
patch(p3, pc);
patch(p4, pc);
patch(p5, pc);
regfree(&s);
regfree(&creg);
olsh_break:
regfree(&bl);
regfree(&bh);
break;
case ORSH:
regalloc(&bl, lo1.type, N);
regalloc(&bh, hi1.type, N);
gins(AMOVW, &hi1, &bh);
gins(AMOVW, &lo1, &bl);
if(r->op == OLITERAL) {
v = mpgetfix(r->val.u.xval);
if(v >= 64) {
if(bh.type->etype == TINT32) {
// MOVW bh->31, al
gshift(AMOVW, &bh, SHIFT_AR, 31, &al);
// MOVW bh->31, ah
gshift(AMOVW, &bh, SHIFT_AR, 31, &ah);
} else {
gins(AEOR, &al, &al);
gins(AEOR, &ah, &ah);
}
} else if(v > 32) {
if(bh.type->etype == TINT32) {
// MOVW bh->(v-32), al
gshift(AMOVW, &bh, SHIFT_AR, v-32, &al);
// MOVW bh->31, ah
gshift(AMOVW, &bh, SHIFT_AR, 31, &ah);
} else {
// MOVW bh>>(v-32), al
gshift(AMOVW, &bh, SHIFT_LR, v-32, &al);
gins(AEOR, &ah, &ah);
}
} else if(v == 32) {
gins(AMOVW, &bh, &al);
if(bh.type->etype == TINT32) {
// MOVW bh->31, ah
gshift(AMOVW, &bh, SHIFT_AR, 31, &ah);
} else {
gins(AEOR, &ah, &ah);
}
} else if( v > 0) {
// MOVW bl>>v, al
gshift(AMOVW, &bl, SHIFT_LR, v, &al);
// OR bh<<(32-v), al
gshift(AORR, &bh, SHIFT_LL, 32-v, &al);
if(bh.type->etype == TINT32) {
// MOVW bh->v, ah
gshift(AMOVW, &bh, SHIFT_AR, v, &ah);
} else {
// MOVW bh>>v, ah
gshift(AMOVW, &bh, SHIFT_LR, v, &ah);
}
} else {
gins(AMOVW, &bl, &al);
gins(AMOVW, &bh, &ah);
}
goto orsh_break;
}
regalloc(&s, types[TUINT32], N);
regalloc(&creg, types[TUINT32], N);
if (is64(r->type)) {
// shift is >= 1<<32
split64(r, &cl, &ch);
gmove(&ch, &s);
p1 = gins(AMOVW, &s, &s);
p1->scond |= C_SBIT;
p6 = gbranch(ABNE, T);
gmove(&cl, &s);
splitclean();
} else {
gmove(r, &s);
p6 = P;
}
p1 = gins(AMOVW, &s, &s);
p1->scond |= C_SBIT;
// shift == 0
p1 = gins(AMOVW, &bl, &al);
p1->scond = C_SCOND_EQ;
p1 = gins(AMOVW, &bh, &ah);
p1->scond = C_SCOND_EQ;
p2 = gbranch(ABEQ, T);
// check if shift is < 32
nodconst(&n1, types[TUINT32], 32);
gmove(&n1, &creg);
gcmp(ACMP, &s, &creg);
// MOVW.LO bl>>s, al
p1 = gregshift(AMOVW, &bl, SHIFT_LR, &s, &al);
p1->scond = C_SCOND_LO;
// SUB.LO s,creg
p1 = gins(ASUB, &s, &creg);
p1->scond = C_SCOND_LO;
// OR.LO bh<<(32-s), al
p1 = gregshift(AORR, &bh, SHIFT_LL, &creg, &al);
p1->scond = C_SCOND_LO;
if(bh.type->etype == TINT32) {
// MOVW bh->s, ah
p1 = gregshift(AMOVW, &bh, SHIFT_AR, &s, &ah);
} else {
// MOVW bh>>s, ah
p1 = gregshift(AMOVW, &bh, SHIFT_LR, &s, &ah);
}
p1->scond = C_SCOND_LO;
// BLO end
p3 = gbranch(ABLO, T);
// shift == 32
if(bh.type->etype == TINT32)
p1 = gshift(AMOVW, &bh, SHIFT_AR, 31, &ah);
else
p1 = gins(AEOR, &al, &al);
p1->scond = C_SCOND_EQ;
p1 = gins(AMOVW, &bh, &al);
p1->scond = C_SCOND_EQ;
p4 = gbranch(ABEQ, T);
// check if shift is < 64
nodconst(&n1, types[TUINT32], 64);
gmove(&n1, &creg);
gcmp(ACMP, &s, &creg);
// MOVW.LO creg>>1, creg
p1 = gshift(AMOVW, &creg, SHIFT_LR, 1, &creg);
p1->scond = C_SCOND_LO;
// SUB.LO creg, s
p1 = gins(ASUB, &creg, &s);
p1->scond = C_SCOND_LO;
if(bh.type->etype == TINT32) {
// MOVW bh->(s-32), al
p1 = gregshift(AMOVW, &bh, SHIFT_AR, &s, &al);
p1->scond = C_SCOND_LO;
// MOVW bh->31, ah
p1 = gshift(AMOVW, &bh, SHIFT_AR, 31, &ah);
p1->scond = C_SCOND_LO;
} else {
// MOVW bh>>(v-32), al
p1 = gregshift(AMOVW, &bh, SHIFT_LR, &s, &al);
p1->scond = C_SCOND_LO;
p1 = gins(AEOR, &ah, &ah);
p1->scond = C_SCOND_LO;
}
// BLO end
p5 = gbranch(ABLO, T);
// s >= 64
if (p6 != P) patch(p6, pc);
if(bh.type->etype == TINT32) {
// MOVW bh->31, al
gshift(AMOVW, &bh, SHIFT_AR, 31, &al);
// MOVW bh->31, ah
gshift(AMOVW, &bh, SHIFT_AR, 31, &ah);
} else {
gins(AEOR, &al, &al);
gins(AEOR, &ah, &ah);
}
patch(p2, pc);
patch(p3, pc);
patch(p4, pc);
patch(p5, pc);
regfree(&s);
regfree(&creg);
orsh_break:
regfree(&bl);
regfree(&bh);
break;
case OXOR:
case OAND:
case OOR:
// TODO(kaib): literal optimizations
// make constant the right side (it usually is anyway).
// if(lo1.op == OLITERAL) {
// nswap(&lo1, &lo2);
// nswap(&hi1, &hi2);
// }
// if(lo2.op == OLITERAL) {
// // special cases for constants.
// lv = mpgetfix(lo2.val.u.xval);
// hv = mpgetfix(hi2.val.u.xval);
// splitclean(); // right side
// split64(res, &lo2, &hi2);
// switch(n->op) {
// case OXOR:
// gmove(&lo1, &lo2);
// gmove(&hi1, &hi2);
// switch(lv) {
// case 0:
// break;
// case 0xffffffffu:
// gins(ANOTL, N, &lo2);
// break;
// default:
// gins(AXORL, ncon(lv), &lo2);
// break;
// }
// switch(hv) {
// case 0:
// break;
// case 0xffffffffu:
// gins(ANOTL, N, &hi2);
// break;
// default:
// gins(AXORL, ncon(hv), &hi2);
// break;
// }
// break;
// case OAND:
// switch(lv) {
// case 0:
// gins(AMOVL, ncon(0), &lo2);
// break;
// default:
// gmove(&lo1, &lo2);
// if(lv != 0xffffffffu)
// gins(AANDL, ncon(lv), &lo2);
// break;
// }
// switch(hv) {
// case 0:
// gins(AMOVL, ncon(0), &hi2);
// break;
// default:
// gmove(&hi1, &hi2);
// if(hv != 0xffffffffu)
// gins(AANDL, ncon(hv), &hi2);
// break;
// }
// break;
// case OOR:
// switch(lv) {
// case 0:
// gmove(&lo1, &lo2);
// break;
// case 0xffffffffu:
// gins(AMOVL, ncon(0xffffffffu), &lo2);
// break;
// default:
// gmove(&lo1, &lo2);
// gins(AORL, ncon(lv), &lo2);
// break;
// }
// switch(hv) {
// case 0:
// gmove(&hi1, &hi2);
// break;
// case 0xffffffffu:
// gins(AMOVL, ncon(0xffffffffu), &hi2);
// break;
// default:
// gmove(&hi1, &hi2);
// gins(AORL, ncon(hv), &hi2);
// break;
// }
// break;
// }
// splitclean();
// splitclean();
// goto out;
// }
regalloc(&n1, lo1.type, N);
gins(AMOVW, &lo1, &al);
gins(AMOVW, &hi1, &ah);
gins(AMOVW, &lo2, &n1);
gins(optoas(n->op, lo1.type), &n1, &al);
gins(AMOVW, &hi2, &n1);
gins(optoas(n->op, lo1.type), &n1, &ah);
regfree(&n1);
break;
}
if(is64(r->type))
splitclean();
splitclean();
split64(res, &lo1, &hi1);
gins(AMOVW, &al, &lo1);
gins(AMOVW, &ah, &hi1);
splitclean();
//out:
regfree(&al);
regfree(&ah);
}
void
cgen(Node *n, Node *nn)
{
Node *l, *r;
Prog *p1;
Node nod, nod1, nod2, nod3, nod4;
int o;
long v, curs;
if(debug['g']) {
prtree(nn, "cgen lhs");
prtree(n, "cgen");
}
if(n == Z || n->type == T)
return;
if(typesuv[n->type->etype]) {
sugen(n, nn, n->type->width);
return;
}
l = n->left;
r = n->right;
o = n->op;
if(n->addable >= INDEXED) {
if(nn == Z) {
switch(o) {
default:
nullwarn(Z, Z);
break;
case OINDEX:
nullwarn(l, r);
break;
}
return;
}
gmove(n, nn);
return;
}
curs = cursafe;
if(n->complex >= FNX)
if(l->complex >= FNX)
if(r != Z && r->complex >= FNX)
switch(o) {
default:
regret(&nod, r);
cgen(r, &nod);
regsalloc(&nod1, r);
gopcode(OAS, &nod, Z, &nod1);
regfree(&nod);
nod = *n;
nod.right = &nod1;
cgen(&nod, nn);
return;
case OFUNC:
case OCOMMA:
case OANDAND:
case OOROR:
case OCOND:
case ODOT:
break;
}
switch(o) {
default:
diag(n, "unknown op in cgen: %O", o);
break;
case OAS:
if(l->op == OBIT)
goto bitas;
if(l->addable >= INDEXED && l->complex < FNX) {
if(nn != Z || r->addable < INDEXED) {
if(r->complex >= FNX && nn == Z)
regret(&nod, r);
else
regalloc(&nod, r, nn);
cgen(r, &nod);
gmove(&nod, l);
if(nn != Z)
gmove(&nod, nn);
regfree(&nod);
} else
gmove(r, l);
break;
}
if(l->complex >= r->complex) {
reglcgen(&nod1, l, Z);
if(r->addable >= INDEXED) {
gmove(r, &nod1);
if(nn != Z)
gmove(r, nn);
regfree(&nod1);
break;
}
regalloc(&nod, r, nn);
cgen(r, &nod);
} else {
regalloc(&nod, r, nn);
cgen(r, &nod);
reglcgen(&nod1, l, Z);
}
gmove(&nod, &nod1);
regfree(&nod);
regfree(&nod1);
break;
bitas:
n = l->left;
regalloc(&nod, r, nn);
if(l->complex >= r->complex) {
reglcgen(&nod1, n, Z);
cgen(r, &nod);
} else {
cgen(r, &nod);
reglcgen(&nod1, n, Z);
}
regalloc(&nod2, n, Z);
gopcode(OAS, &nod1, Z, &nod2);
bitstore(l, &nod, &nod1, &nod2, nn);
break;
case OBIT:
if(nn == Z) {
nullwarn(l, Z);
break;
}
bitload(n, &nod, Z, Z, nn);
gopcode(OAS, &nod, Z, nn);
regfree(&nod);
break;
case OADD:
case OSUB:
case OAND:
case OOR:
case OXOR:
case OLSHR:
case OASHL:
case OASHR:
/*
* immediate operands
*/
if(nn != Z)
if(r->op == OCONST)
if(!typefd[n->type->etype]) {
cgen(l, nn);
if(r->vconst == 0)
if(o != OAND)
break;
if(nn != Z)
gopcode(o, r, Z, nn);
break;
}
case OLMUL:
case OLDIV:
case OLMOD:
case OMUL:
case ODIV:
case OMOD:
if(nn == Z) {
nullwarn(l, r);
break;
}
if(o == OMUL || o == OLMUL) {
if(mulcon(n, nn))
break;
}
if(l->complex >= r->complex) {
regalloc(&nod, l, nn);
cgen(l, &nod);
regalloc(&nod1, r, Z);
cgen(r, &nod1);
gopcode(o, &nod1, Z, &nod);
} else {
regalloc(&nod, r, nn);
cgen(r, &nod);
regalloc(&nod1, l, Z);
cgen(l, &nod1);
gopcode(o, &nod, &nod1, &nod);
}
gopcode(OAS, &nod, Z, nn);
regfree(&nod);
regfree(&nod1);
break;
case OASLSHR:
case OASASHL:
case OASASHR:
case OASAND:
case OASADD:
case OASSUB:
case OASXOR:
case OASOR:
if(l->op == OBIT)
goto asbitop;
if(r->op == OCONST)
if(!typefd[r->type->etype])
if(!typefd[n->type->etype]) {
if(l->addable < INDEXED)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
regalloc(&nod, r, nn);
gopcode(OAS, &nod2, Z, &nod);
gopcode(o, r, Z, &nod);
gopcode(OAS, &nod, Z, &nod2);
regfree(&nod);
if(l->addable < INDEXED)
regfree(&nod2);
break;
}
case OASLMUL:
case OASLDIV:
case OASLMOD:
case OASMUL:
case OASDIV:
case OASMOD:
if(l->op == OBIT)
goto asbitop;
if(l->complex >= r->complex) {
if(l->addable < INDEXED)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
regalloc(&nod1, r, Z);
cgen(r, &nod1);
} else {
regalloc(&nod1, r, Z);
cgen(r, &nod1);
if(l->addable < INDEXED)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
}
regalloc(&nod, n, nn);
gmove(&nod2, &nod);
gopcode(o, &nod1, Z, &nod);
gmove(&nod, &nod2);
if(nn != Z)
gopcode(OAS, &nod, Z, nn);
regfree(&nod);
regfree(&nod1);
if(l->addable < INDEXED)
regfree(&nod2);
break;
asbitop:
regalloc(&nod4, n, nn);
if(l->complex >= r->complex) {
bitload(l, &nod, &nod1, &nod2, &nod4);
regalloc(&nod3, r, Z);
cgen(r, &nod3);
} else {
regalloc(&nod3, r, Z);
cgen(r, &nod3);
bitload(l, &nod, &nod1, &nod2, &nod4);
}
gmove(&nod, &nod4);
gopcode(o, &nod3, Z, &nod4);
regfree(&nod3);
gmove(&nod4, &nod);
regfree(&nod4);
bitstore(l, &nod, &nod1, &nod2, nn);
break;
case OADDR:
if(nn == Z) {
nullwarn(l, Z);
break;
}
lcgen(l, nn);
break;
case OFUNC:
if(l->complex >= FNX) {
if(l->op != OIND)
diag(n, "bad function call");
regret(&nod, l->left);
cgen(l->left, &nod);
regsalloc(&nod1, l->left);
gopcode(OAS, &nod, Z, &nod1);
regfree(&nod);
nod = *n;
nod.left = &nod2;
nod2 = *l;
nod2.left = &nod1;
nod2.complex = 1;
cgen(&nod, nn);
return;
}
o = reg[REGARG];
gargs(r, &nod, &nod1);
if(l->addable < INDEXED) {
reglcgen(&nod, l, Z);
gopcode(OFUNC, Z, Z, &nod);
regfree(&nod);
} else
gopcode(OFUNC, Z, Z, l);
if(REGARG)
if(o != reg[REGARG])
reg[REGARG]--;
if(nn != Z) {
regret(&nod, n);
gopcode(OAS, &nod, Z, nn);
regfree(&nod);
}
break;
case OIND:
if(nn == Z) {
nullwarn(l, Z);
break;
}
regialloc(&nod, n, nn);
r = l;
while(r->op == OADD)
r = r->right;
if(sconst(r)) {
v = r->vconst;
r->vconst = 0;
cgen(l, &nod);
nod.xoffset += v;
r->vconst = v;
} else
cgen(l, &nod);
regind(&nod, n);
gopcode(OAS, &nod, Z, nn);
regfree(&nod);
break;
case OEQ:
case ONE:
case OLE:
case OLT:
case OGE:
case OGT:
case OLO:
case OLS:
case OHI:
case OHS:
if(nn == Z) {
nullwarn(l, r);
break;
}
boolgen(n, 1, nn);
break;
case OANDAND:
case OOROR:
boolgen(n, 1, nn);
if(nn == Z)
patch(p, pc);
break;
case ONOT:
if(nn == Z) {
nullwarn(l, Z);
break;
}
boolgen(n, 1, nn);
break;
case OCOMMA:
cgen(l, Z);
cgen(r, nn);
break;
case OCAST:
if(nn == Z) {
nullwarn(l, Z);
break;
}
/*
* convert from types l->n->nn
*/
if(nocast(l->type, n->type)) {
if(nocast(n->type, nn->type)) {
cgen(l, nn);
break;
}
}
regalloc(&nod, l, nn);
cgen(l, &nod);
regalloc(&nod1, n, &nod);
gopcode(OAS, &nod, Z, &nod1);
gopcode(OAS, &nod1, Z, nn);
regfree(&nod1);
regfree(&nod);
break;
case ODOT:
sugen(l, nodrat, l->type->width);
if(nn != Z) {
warn(n, "non-interruptable temporary");
nod = *nodrat;
if(!r || r->op != OCONST) {
diag(n, "DOT and no offset");
break;
}
nod.xoffset += (long)r->vconst;
nod.type = n->type;
cgen(&nod, nn);
}
break;
case OCOND:
bcgen(l, 1);
p1 = p;
cgen(r->left, nn);
gbranch(OGOTO);
patch(p1, pc);
p1 = p;
cgen(r->right, nn);
patch(p1, pc);
break;
case OPOSTINC:
case OPOSTDEC:
v = 1;
if(l->type->etype == TIND)
v = l->type->link->width;
if(o == OPOSTDEC)
v = -v;
if(l->op == OBIT)
goto bitinc;
if(nn == Z)
goto pre;
if(l->addable < INDEXED)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
regalloc(&nod, l, nn);
gopcode(OAS, &nod2, Z, &nod);
regalloc(&nod1, l, Z);
if(typefd[l->type->etype]) {
regalloc(&nod3, l, Z);
if(v < 0) {
gopcode(OAS, nodfconst(-v), Z, &nod3);
gopcode(OSUB, &nod3, &nod, &nod1);
} else {
gopcode(OAS, nodfconst(v), Z, &nod3);
gopcode(OADD, &nod3, &nod, &nod1);
}
regfree(&nod3);
} else
gopcode(OADD, nodconst(v), &nod, &nod1);
gopcode(OAS, &nod1, Z, &nod2);
regfree(&nod);
regfree(&nod1);
if(l->addable < INDEXED)
regfree(&nod2);
break;
case OPREINC:
case OPREDEC:
v = 1;
if(l->type->etype == TIND)
v = l->type->link->width;
if(o == OPREDEC)
v = -v;
if(l->op == OBIT)
goto bitinc;
pre:
if(l->addable < INDEXED)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
regalloc(&nod, l, nn);
gopcode(OAS, &nod2, Z, &nod);
if(typefd[l->type->etype]) {
regalloc(&nod3, l, Z);
if(v < 0) {
gopcode(OAS, nodfconst(-v), Z, &nod3);
gopcode(OSUB, &nod3, Z, &nod);
} else {
gopcode(OAS, nodfconst(v), Z, &nod3);
gopcode(OADD, &nod3, Z, &nod);
}
regfree(&nod3);
} else
gopcode(OADD, nodconst(v), Z, &nod);
gopcode(OAS, &nod, Z, &nod2);
if(nn && l->op == ONAME) /* in x=++i, emit USED(i) */
gins(ANOP, l, Z);
regfree(&nod);
if(l->addable < INDEXED)
regfree(&nod2);
break;
bitinc:
if(nn != Z && (o == OPOSTINC || o == OPOSTDEC)) {
bitload(l, &nod, &nod1, &nod2, Z);
gopcode(OAS, &nod, Z, nn);
gopcode(OADD, nodconst(v), Z, &nod);
bitstore(l, &nod, &nod1, &nod2, Z);
break;
}
bitload(l, &nod, &nod1, &nod2, nn);
gopcode(OADD, nodconst(v), Z, &nod);
bitstore(l, &nod, &nod1, &nod2, nn);
break;
}
cursafe = curs;
}
/*
* generate:
* res = n;
* simplifies and calls gmove.
*/
void
cgen(Node *n, Node *res)
{
Node *nl, *nr, *r;
Node n1, n2;
int a, f;
Prog *p1, *p2, *p3;
Addr addr;
if(debug['g']) {
dump("\ncgen-n", n);
dump("cgen-res", res);
}
if(n == N || n->type == T)
goto ret;
if(res == N || res->type == T)
fatal("cgen: res nil");
while(n->op == OCONVNOP)
n = n->left;
// inline slices
if(cgen_inline(n, res))
goto ret;
if(n->ullman >= UINF) {
if(n->op == OINDREG)
fatal("cgen: this is going to misscompile");
if(res->ullman >= UINF) {
tempname(&n1, n->type);
cgen(n, &n1);
cgen(&n1, res);
goto ret;
}
}
if(isfat(n->type)) {
sgen(n, res, n->type->width);
goto ret;
}
if(!res->addable) {
if(n->ullman > res->ullman) {
regalloc(&n1, n->type, res);
cgen(n, &n1);
if(n1.ullman > res->ullman) {
dump("n1", &n1);
dump("res", res);
fatal("loop in cgen");
}
cgen(&n1, res);
regfree(&n1);
goto ret;
}
if(res->ullman >= UINF)
goto gen;
if(complexop(n, res)) {
complexgen(n, res);
goto ret;
}
f = 1; // gen thru register
switch(n->op) {
case OLITERAL:
if(smallintconst(n))
f = 0;
break;
case OREGISTER:
f = 0;
break;
}
if(!iscomplex[n->type->etype]) {
a = optoas(OAS, res->type);
if(sudoaddable(a, res, &addr)) {
if(f) {
regalloc(&n2, res->type, N);
cgen(n, &n2);
p1 = gins(a, &n2, N);
regfree(&n2);
} else
p1 = gins(a, n, N);
p1->to = addr;
if(debug['g'])
print("%P [ignore previous line]\n", p1);
sudoclean();
goto ret;
}
}
gen:
igen(res, &n1, N);
cgen(n, &n1);
regfree(&n1);
goto ret;
}
// update addressability for string, slice
// can't do in walk because n->left->addable
// changes if n->left is an escaping local variable.
switch(n->op) {
case OLEN:
if(isslice(n->left->type) || istype(n->left->type, TSTRING))
n->addable = n->left->addable;
break;
case OCAP:
if(isslice(n->left->type))
n->addable = n->left->addable;
break;
}
if(complexop(n, res)) {
complexgen(n, res);
goto ret;
}
if(n->addable) {
gmove(n, res);
goto ret;
}
nl = n->left;
nr = n->right;
if(nl != N && nl->ullman >= UINF)
if(nr != N && nr->ullman >= UINF) {
tempname(&n1, nl->type);
cgen(nl, &n1);
n2 = *n;
n2.left = &n1;
cgen(&n2, res);
goto ret;
}
if(!iscomplex[n->type->etype]) {
a = optoas(OAS, n->type);
if(sudoaddable(a, n, &addr)) {
if(res->op == OREGISTER) {
p1 = gins(a, N, res);
p1->from = addr;
} else {
regalloc(&n2, n->type, N);
p1 = gins(a, N, &n2);
p1->from = addr;
gins(a, &n2, res);
regfree(&n2);
}
sudoclean();
goto ret;
}
}
switch(n->op) {
default:
dump("cgen", n);
fatal("cgen: unknown op %N", n);
break;
// these call bgen to get a bool value
case OOROR:
case OANDAND:
case OEQ:
case ONE:
case OLT:
case OLE:
case OGE:
case OGT:
case ONOT:
p1 = gbranch(AJMP, T);
p2 = pc;
gmove(nodbool(1), res);
p3 = gbranch(AJMP, T);
patch(p1, pc);
bgen(n, 1, p2);
gmove(nodbool(0), res);
patch(p3, pc);
goto ret;
case OPLUS:
cgen(nl, res);
goto ret;
// unary
case OCOM:
a = optoas(OXOR, nl->type);
regalloc(&n1, nl->type, N);
cgen(nl, &n1);
nodconst(&n2, nl->type, -1);
gins(a, &n2, &n1);
gmove(&n1, res);
regfree(&n1);
goto ret;
case OMINUS:
if(isfloat[nl->type->etype]) {
nr = nodintconst(-1);
convlit(&nr, n->type);
a = optoas(OMUL, nl->type);
goto sbop;
}
a = optoas(n->op, nl->type);
goto uop;
// symmetric binary
case OAND:
case OOR:
case OXOR:
case OADD:
case OMUL:
a = optoas(n->op, nl->type);
if(a != AIMULB)
goto sbop;
cgen_bmul(n->op, nl, nr, res);
break;
// asymmetric binary
case OSUB:
a = optoas(n->op, nl->type);
goto abop;
case OCONV:
regalloc(&n1, nl->type, res);
regalloc(&n2, n->type, &n1);
cgen(nl, &n1);
// if we do the conversion n1 -> n2 here
// reusing the register, then gmove won't
// have to allocate its own register.
gmove(&n1, &n2);
gmove(&n2, res);
regfree(&n2);
regfree(&n1);
break;
case ODOT:
case ODOTPTR:
case OINDEX:
case OIND:
case ONAME: // PHEAP or PPARAMREF var
igen(n, &n1, res);
gmove(&n1, res);
regfree(&n1);
break;
case OLEN:
if(istype(nl->type, TMAP) || istype(nl->type, TCHAN)) {
// map and chan have len in the first 32-bit word.
// a zero pointer means zero length
regalloc(&n1, types[tptr], res);
cgen(nl, &n1);
nodconst(&n2, types[tptr], 0);
gins(optoas(OCMP, types[tptr]), &n1, &n2);
p1 = gbranch(optoas(OEQ, types[tptr]), T);
n2 = n1;
n2.op = OINDREG;
n2.type = types[TINT32];
gmove(&n2, &n1);
patch(p1, pc);
gmove(&n1, res);
regfree(&n1);
break;
}
if(istype(nl->type, TSTRING) || isslice(nl->type)) {
// both slice and string have len one pointer into the struct.
// a zero pointer means zero length
regalloc(&n1, types[tptr], res);
agen(nl, &n1);
n1.op = OINDREG;
n1.type = types[TUINT32];
n1.xoffset = Array_nel;
gmove(&n1, res);
regfree(&n1);
break;
}
fatal("cgen: OLEN: unknown type %lT", nl->type);
break;
case OCAP:
if(istype(nl->type, TCHAN)) {
// chan has cap in the second 32-bit word.
// a zero pointer means zero length
regalloc(&n1, types[tptr], res);
cgen(nl, &n1);
nodconst(&n2, types[tptr], 0);
gins(optoas(OCMP, types[tptr]), &n1, &n2);
p1 = gbranch(optoas(OEQ, types[tptr]), T);
n2 = n1;
n2.op = OINDREG;
n2.xoffset = 4;
n2.type = types[TINT32];
gmove(&n2, &n1);
patch(p1, pc);
gmove(&n1, res);
regfree(&n1);
break;
}
if(isslice(nl->type)) {
regalloc(&n1, types[tptr], res);
agen(nl, &n1);
n1.op = OINDREG;
n1.type = types[TUINT32];
n1.xoffset = Array_cap;
gmove(&n1, res);
regfree(&n1);
break;
}
fatal("cgen: OCAP: unknown type %lT", nl->type);
break;
case OADDR:
agen(nl, res);
break;
case OCALLMETH:
cgen_callmeth(n, 0);
cgen_callret(n, res);
break;
case OCALLINTER:
cgen_callinter(n, res, 0);
cgen_callret(n, res);
break;
case OCALLFUNC:
cgen_call(n, 0);
cgen_callret(n, res);
break;
case OMOD:
case ODIV:
if(isfloat[n->type->etype]) {
a = optoas(n->op, nl->type);
goto abop;
}
cgen_div(n->op, nl, nr, res);
break;
case OLSH:
case ORSH:
cgen_shift(n->op, nl, nr, res);
break;
}
goto ret;
sbop: // symmetric binary
if(nl->ullman < nr->ullman) {
r = nl;
nl = nr;
nr = r;
}
abop: // asymmetric binary
if(nl->ullman >= nr->ullman) {
regalloc(&n1, nl->type, res);
cgen(nl, &n1);
if(sudoaddable(a, nr, &addr)) {
p1 = gins(a, N, &n1);
p1->from = addr;
gmove(&n1, res);
sudoclean();
regfree(&n1);
goto ret;
}
regalloc(&n2, nr->type, N);
cgen(nr, &n2);
} else {
regalloc(&n2, nr->type, N);
cgen(nr, &n2);
regalloc(&n1, nl->type, res);
cgen(nl, &n1);
}
gins(a, &n2, &n1);
gmove(&n1, res);
regfree(&n1);
regfree(&n2);
goto ret;
uop: // unary
regalloc(&n1, nl->type, res);
cgen(nl, &n1);
gins(a, N, &n1);
gmove(&n1, res);
regfree(&n1);
goto ret;
ret:
;
}
