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Named Return Value Optimization

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This commit is contained in:
Alexey Prokhin
2011-09-13 12:01:51 +04:00
parent 0e754b5acd
commit 9a9999854f
6 changed files with 55 additions and 23 deletions
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15
gen/statements.cpp
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@@ -75,10 +75,9 @@ void ReturnStatement::toIR(IRState* p)
DValue* e = exp->toElemDtor(p);
// store return value
DtoAssign(loc, rvar, e);
#if DMDV2
// call postblit if necessary
if (!p->func()->type->isref)
if (!p->func()->type->isref && !(f->decl->nrvo_can && f->decl->nrvo_var))
callPostblit(loc, exp, rvar->getLVal());
#endif
@@ -101,14 +100,20 @@ void ReturnStatement::toIR(IRState* p)
if (!exp && (p->topfunc() == p->mainFunc)) {
v = LLConstant::getNullValue(p->mainFunc->getReturnType());
} else {
DValue* dval = exp->toElemDtor(p);
#if DMDV2
DValue* dval = 0;
// call postblit if necessary
if (!p->func()->type->isref)
if (!p->func()->type->isref) {
dval = exp->toElemDtor(p);
callPostblit(loc, exp, dval->getRVal());
} else {
Expression *ae = exp->addressOf(NULL);
dval = ae->toElemDtor(p);
}
// do abi specific transformations on the return value
v = p->func()->type->fty.putRet(exp->type, dval, p->func()->type->isref);
v = p->func()->type->fty.putRet(exp->type, dval);
#else
DValue* dval = exp->toElemDtor(p);
v = p->func()->type->fty.putRet(exp->type, dval);
#endif
}