[PATCH 1/5] std::latch: reduce internal implementation from ptrdiff_t to int

[Andreas Schwab]

On Feb 26 2021, Thiago Macieira wrote:

> On Friday, 26 February 2021 10:14:42 PST Andreas Schwab wrote:
>> On Feb 26 2021, Thiago Macieira via Gcc-patches wrote:
>> > @@ -85,7 +85,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
>> > }
>> > 
>> > private:
>> > -    alignas(__alignof__(ptrdiff_t)) ptrdiff_t _M_a;
>> > +    alignas(__alignof__(int)) int _M_a;
>> 
>> Futexes must be aligned to 4 bytes.
>
> Agreed, but doesn't this accomplish that?

No.  It uses whatever alignment the type already has, and is an
elaborate no-op.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
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