[Issue 16651] atomicOp!"-="(ulong, uint) = wrong result/codegen

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16651

safety0ff.bugz <safety0ff.bugz at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |safety0ff.bugz at gmail.com

--- Comment #2 from safety0ff.bugz <safety0ff.bugz at gmail.com> ---
(In reply to ag0aep6g from comment #1)
> 
> Looks like a bug in druntime code (core.atomic) rather than dmd.

Yup, atomicFetchSub [1] doesn't widen the modifier before negating it.
This is necessary when the modifier is unsigned and narrower than the value's
type.


[1] https://github.com/dlang/druntime/blob/master/src/core/atomic.d#L684

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