Read/Write memory barriers in D?

[Igor via Digitalmars-d-learn]

I am converting a C code that uses this macro:

#define CompletePastWritesBeforeFutureWrites _WriteBarrier(); 
_mm_sfence()

As far as I see core.atomic:atomicFence() is the equivalent of 
_mm_sfence() but I can't find what would be the equivalent of 
_WriteBarrier(). As far as I understand it is used just to tell 
the compiler it can't rearrange instructions during optimizations 
so subsequent memory writes happen before previous ones. Same for 
_ReadBarrier().