...eax, %eax
    movl    %ebp, %esp
    popl    %ebp
    ret



The first group of movl are the...

...Maybe having it as a template Closure!(ret-type, arg types...)
and instantiator function called...

...D5test51cG16i
    xorl    %eax, %eax
    addl    $12, %esp
    ret


It uses the instruction movdqa, that assumes...

...esp
    haddpd  %xmm0, %xmm0
    movsd   %xmm0, (%esp)
    fldl    (%esp)
    addl    $20, %esp
    ret


Bye,
bearophile

...fldl    (%esp)
    movl    %ebp, %esp
    popl    %ebp
    ret


But gcc compiles similar code (that uses...

...eax, %eax
	addl	$12, %esp
	popl	%esi
	ret


It uses addpd that works with two...

...property
        {
            auto ret = typeof(this)(this);
            ret._gen = this._gen.save;
            return ret;
        }

        real remainder...

...typeof(this) save()
        {
            auto ret = this;
            ret._input = _input.save;
            return ret;
        }

If (and only...

...ret ~= "X[" ~ iStr ~ "]";
                }
                else
                {
                    ret ~= ch;
                }
            }

            if (i != X.length - 1)
            {
                ret ~= ",";
            }
        }
        ret ~= ");";
        return ret...

...1),st
add         rsp,10h
pop         rbp
ret

which looks quite okay. Calling it from...