[Issue 12121] New: atomicLoad!(MemoryOrder.acq) should not emit additional code on X86

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12121

           Summary: atomicLoad!(MemoryOrder.acq) should not emit
                    additional code on X86
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: druntime
        AssignedTo: nobody at puremagic.com
        ReportedBy: stanislav.blinov at gmail.com


--- Comment #0 from Stanislav Blinov <stanislav.blinov at gmail.com> 2014-02-09 10:49:48 PST ---
Current implementation of needsLoadBarrier in core.atomic is as follows:

        template needsLoadBarrier( MemoryOrder ms )
        {
            enum bool needsLoadBarrier = ms != MemoryOrder.raw;
        }

On X86, acquire loads should not require fences, release-acquire ordering is
automatic.

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