Alignment of struct containing SIMD field - GDC
Cecil Ward via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Thu Mar 2 05:00:08 PST 2017
On Wednesday, 1 March 2017 at 22:15:59 UTC, Iain Buclaw wrote:
> On Wednesday, 1 March 2017 at 19:09:24 UTC, Johan Engelen wrote:
>> On Wednesday, 1 March 2017 at 18:34:16 UTC, Iain Buclaw wrote:
>>>
>>> Simple test case would be:
>>>
>>> struct vec_struct {
>>> bool b2;
>>> struct {
>>> bool b;
>>> int8 field;
>>> }
>>> }
>>>
>>> static assert(vec_struct.b.offsetof == 32);
>>> static assert(vec_struct.field.offsetof == 64);
>>
>> With explicit align(32), it works:
>> https://godbolt.org/g/3GjOHW
>>
>> - Johan
>
> Well obviously, because it adheres to explicit alignment. The
> compiler just has the wrong idea of how default alignment
> should work.
>
> Raised bug here, and I'm raising a PR now also.
> https://issues.dlang.org/show_bug.cgi?id=17237
Iain, this of course is present in my version of LDC too. (I
checked.) You couldn't poke David Nadlinger or whoever for me?
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