On Phobos GC hunt

[Daniel Murphy via Digitalmars-d]

"Martin Nowak"  wrote in message news:m1udcn$s35$1 at digitalmars.com...

> On 10/08/2014 10:01 PM, Andrei Alexandrescu wrote:
> >
> > That's a bummer. Can we get the compiler to remove the "if (__ctfe)"
> > code after semantic checking?
> >
> > Andrei
>
> It seems that __ctfe is treated as constant in the backend.
> > At least there is no asm code generated for these examples (even without
> -O).
>
>      void main()
>      {
>          import std.stdio;
>          if (__ctfe)
>              writeln("foo");
>      }
>
>      int main() { return __ctfe ? 1 : 0; }

__ctfe is passed to the backend as 'false', and even with -O the basic 
optimizations will strip it as dead code.  So it is removed after semantic 
checking, but that doesn't help as semantic checking includes @nogc 
checking.