Tail call optimization in dmd

[Denis Koroskin]

Hi guys!

Does anyone have an experience with tail recursion (in dmd in particular)?

I have (at least) 3 functions that are invoked recursively like this:

A -> B -> C -> A -> B -> ...

Problem is that even though I turned all three of them into tail recursive  
functions, each cycle still consumes about 80 bytes of stack.

After hours of debugging I've noticed that dmd does terrible work on TCO.  
For example, the following produces stack overflow:

void foo()
{
	{
	}
	
	bar();
}

void bar()
{
	{
	}
	
	foo();
}

void main()
{
	foo();
}

I compile code with -O -release -inline if that matters.

Any tips would be highly appreciated.