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

[via Digitalmars-d-bugs]

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

ag0aep6g at gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ag0aep6g at gmail.com
          Component|dmd                         |druntime
           Hardware|x86_64                      |All
                 OS|Windows                     |All

--- Comment #1 from ag0aep6g at gmail.com ---
Same happens with -m32 and smaller types:

----
void main()
{
    import std.stdio    : writeln;
    import core.atomic  : atomicOp;

    shared uint foo = 2;
    ubyte bar = 1;
    atomicOp!"-="( foo, bar );
    writeln( "foo = ", foo );    // foo = 257
}
----

Also happens on Linux.

Looks like a bug in druntime code (core.atomic) rather than dmd. I think it
works with LDC because they've added a path of their own to druntime [1].


[1]
https://github.com/ldc-developers/druntime/blob/049b8efdf0daebcc1cfe690c5cf7585125c1ff72/src/core/atomic.d#L177

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