/*
* XXX This is a hack. We cannot have (l)doubles in more than one
* register class. So we bounce them in and out of temps to
* move them in and out of the right registers.
*/
static void
param_double(struct symtab *sym, int *regp, int dotemps)
{
int reg = *regp;
NODE *p, *q, *t;
int navail;
int tmpnr;
/* alignment */
++reg;
reg &= ~1;
navail = nargregs - (reg - A0);
if (navail < 2) {
/* would have appeared half in registers/half
* on the stack, but alignment ensures it
* appears on the stack */
if (dotemps)
putintemp(sym);
*regp = reg;
return;
}
t = tempnode(0, LONGLONG, 0, 0);
tmpnr = regno(t);
q = block(REG, NIL, NIL, LONGLONG, 0, 0);
q->n_rval = A0A1 + (reg - A0);
p = buildtree(ASSIGN, t, q);
ecomp(p);
if (dotemps) {
sym->soffset = tmpnr;
sym->sflags |= STNODE;
} else {
q = tempnode(tmpnr, sym->stype, sym->sdf, sym->sap);
p = nametree(sym);
p = buildtree(ASSIGN, p, q);
ecomp(p);
}
*regp = reg + 2;
}
/*
* Beginning-of-function code:
*
* 'sp' is an array of indices in symtab for the arguments
* 'cnt' is the number of arguments
*/
void
bfcode(struct symtab **sp, int cnt)
{
union arglist *usym;
int saveallargs = 0;
int i, argofs = 0;
/*
* Detect if this function has ellipses and save all
* argument registers onto stack.
*/
usym = cftnsp->sdf->dfun;
while (usym && usym->type != TNULL) {
if (usym->type == TELLIPSIS) {
saveallargs = 1;
break;
}
++usym;
}
/* if returning a structure, move the hidden argument into a TEMP */
if (cftnsp->stype == STRTY+FTN || cftnsp->stype == UNIONTY+FTN) {
param_retstruct();
++argofs;
}
/* recalculate the arg offset and create TEMP moves */
for (i = 0; i < cnt; i++) {
if (sp[i] == NULL)
continue;
if ((argofs >= NARGREGS) && !xtemps)
break;
if (argofs > NARGREGS) {
putintemp(sp[i]);
} else if (sp[i]->stype == STRTY || sp[i]->stype == UNIONTY) {
param_struct(sp[i], &argofs);
} else if (DEUNSIGN(sp[i]->stype) == LONGLONG) {
param_64bit(sp[i], &argofs, xtemps && !saveallargs);
} else if (sp[i]->stype == DOUBLE || sp[i]->stype == LDOUBLE) {
if (features(FEATURE_HARDFLOAT))
param_double(sp[i], &argofs,
xtemps && !saveallargs);
else
param_64bit(sp[i], &argofs,
xtemps && !saveallargs);
} else if (sp[i]->stype == FLOAT) {
if (features(FEATURE_HARDFLOAT))
param_float(sp[i], &argofs,
xtemps && !saveallargs);
else
param_32bit(sp[i], &argofs,
xtemps && !saveallargs);
} else {
param_32bit(sp[i], &argofs, xtemps && !saveallargs);
}
}
/* if saveallargs, save the rest of the args onto the stack */
while (saveallargs && argofs < NARGREGS) {
NODE *p, *q;
int off = ARGINIT/SZINT + argofs;
q = block(REG, NIL, NIL, INT, 0, 0);
regno(q) = R0 + argofs++;
p = block(REG, NIL, NIL, INT, 0, 0);
regno(p) = FPREG;
p = block(PLUS, p, bcon(4*off), INT, 0, 0);
p = block(UMUL, p, NIL, INT, 0, 0);
p = buildtree(ASSIGN, p, q);
ecomp(p);
}
}
/*
* code for the beginning of a function; a is an array of
* indices in symtab for the arguments; n is the number
*/
void
bfcode(struct symtab **sp, int cnt)
{
union arglist *usym;
int lastreg = A0 + nargregs - 1;
int saveallargs = 0;
int i, reg;
/*
* Detect if this function has ellipses and save all
* argument register onto stack.
*/
usym = cftnsp->sdf->dfun;
while (usym && usym->type != TNULL) {
if (usym->type == TELLIPSIS) {
saveallargs = 1;
break;
}
++usym;
}
reg = A0;
/* assign hidden return structure to temporary */
if (cftnsp->stype == STRTY+FTN || cftnsp->stype == UNIONTY+FTN) {
param_retptr();
++reg;
}
/* recalculate the arg offset and create TEMP moves */
for (i = 0; i < cnt; i++) {
if ((reg > lastreg) && !xtemps)
break;
else if (reg > lastreg)
putintemp(sp[i]);
else if (sp[i]->stype == STRTY || sp[i]->stype == UNIONTY)
param_struct(sp[i], ®);
else if (DEUNSIGN(sp[i]->stype) == LONGLONG)
param_64bit(sp[i], ®, xtemps && !saveallargs);
else if (sp[i]->stype == DOUBLE || sp[i]->stype == LDOUBLE)
param_double(sp[i], ®, xtemps && !saveallargs);
else if (sp[i]->stype == FLOAT)
param_float(sp[i], ®, xtemps && !saveallargs);
else
param_32bit(sp[i], ®, xtemps && !saveallargs);
}
/* if saveallargs, save the rest of the args onto the stack */
if (!saveallargs)
return;
while (reg <= lastreg) {
NODE *p, *q;
int off = ARGINIT/SZINT + (reg - A0);
q = block(REG, NIL, NIL, INT, 0, 0);
q->n_rval = reg++;
p = block(REG, NIL, NIL, INT, 0, 0);
p->n_rval = FP;
p = block(PLUS, p, bcon(4*off), INT, 0, 0);
p = block(UMUL, p, NIL, INT, 0, 0);
p = buildtree(ASSIGN, p, q);
ecomp(p);
}
}
