DValue* DtoCastComplex(Loc& loc, DValue* val, Type* _to)
{
Type* to = _to->toBasetype();
Type* vty = val->getType()->toBasetype();
if (to->iscomplex()) {
if (vty->size() == to->size())
return val;
llvm::Value *re, *im;
DtoGetComplexParts(loc, val->getType(), val, re, im);
LLType* toty = DtoComplexBaseType(to);
if (to->size() < vty->size()) {
re = gIR->ir->CreateFPTrunc(re, toty, "tmp");
im = gIR->ir->CreateFPTrunc(im, toty, "tmp");
}
else {
re = gIR->ir->CreateFPExt(re, toty, "tmp");
im = gIR->ir->CreateFPExt(im, toty, "tmp");
}
LLValue* pair = DtoAggrPair(DtoType(_to), re, im);
return new DImValue(_to, pair);
}
else if (to->isimaginary()) {
// FIXME: this loads both values, even when we only need one
LLValue* v = val->getRVal();
LLValue* impart = gIR->ir->CreateExtractValue(v, 1, ".im_part");
Type *extractty;
switch (vty->ty) {
default: llvm_unreachable("Unexpected complex floating point type");
case Tcomplex32: extractty = Type::timaginary32; break;
case Tcomplex64: extractty = Type::timaginary64; break;
case Tcomplex80: extractty = Type::timaginary80; break;
}
DImValue* im = new DImValue(extractty, impart);
return DtoCastFloat(loc, im, to);
}
else if (to->ty == Tbool) {
return new DImValue(_to, DtoComplexEquals(loc, TOKnotequal, val, DtoNullValue(vty)));
}
else if (to->isfloating() || to->isintegral()) {
// FIXME: this loads both values, even when we only need one
LLValue* v = val->getRVal();
LLValue* repart = gIR->ir->CreateExtractValue(v, 0, ".re_part");
Type *extractty;
switch (vty->ty) {
default: llvm_unreachable("Unexpected complex floating point type");
case Tcomplex32: extractty = Type::tfloat32; break;
case Tcomplex64: extractty = Type::tfloat64; break;
case Tcomplex80: extractty = Type::tfloat80; break;
}
DImValue* re = new DImValue(extractty, repart);
return DtoCastFloat(loc, re, to);
}
else {
error(loc, "Don't know how to cast %s to %s", vty->toChars(), to->toChars());
fatal();
}
}
void DtoGetComplexParts(Loc &loc, Type *to, DValue *val, DValue *&re,
DValue *&im) {
Type *baserety;
Type *baseimty;
switch (to->toBasetype()->ty) {
default:
llvm_unreachable("Unexpected complex floating point type");
case Tcomplex32:
baserety = Type::tfloat32;
baseimty = Type::timaginary32;
break;
case Tcomplex64:
baserety = Type::tfloat64;
baseimty = Type::timaginary64;
break;
case Tcomplex80:
baserety = Type::tfloat80;
baseimty = Type::timaginary80;
break;
}
Type *t = val->getType()->toBasetype();
if (t->iscomplex()) {
DValue *v = DtoCastComplex(loc, val, to);
if (to->iscomplex()) {
if (v->isLVal()) {
LLValue *reVal =
DtoGEPi(v->getLVal(), 0, 0, ".re_part");
LLValue *imVal =
DtoGEPi(v->getLVal(), 0, 1, ".im_part");
re = new DVarValue(baserety, reVal);
im = new DVarValue(baseimty, imVal);
} else {
LLValue *reVal =
gIR->ir->CreateExtractValue(v->getRVal(), 0, ".re_part");
LLValue *imVal =
gIR->ir->CreateExtractValue(v->getRVal(), 1, ".im_part");
re = new DImValue(baserety, reVal);
im = new DImValue(baseimty, imVal);
}
} else {
DtoGetComplexParts(loc, to, v, re, im);
}
} else if (t->isimaginary()) {
re = nullptr;
im = DtoCastFloat(loc, val, baseimty);
} else if (t->isfloating()) {
re = DtoCastFloat(loc, val, baserety);
im = nullptr;
} else if (t->isintegral()) {
re = DtoCastInt(loc, val, baserety);
im = nullptr;
} else {
llvm_unreachable("Unexpected numeric type.");
}
}