https://issues.dlang.org/show_bug.cgi?id=12891

          Issue ID: 12891
           Summary: add atomicInc and atomicDec to core.atomic
           Product: D
           Version: unspecified
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: druntime
          Assignee: nobody@puremagic.com
          Reporter: code@dawg.eu

At least on the X86 architecture atomic increments/decrements can be done way more efficient using specialized instruction which are not used by the more generic atomicOp.

--