> On Nov 30, 2021, at 12:08 PM, Peter Bergner <berg...@linux.ibm.com> wrote:
>
> On 11/30/21 11:51 AM, Qing Zhao wrote:
>> So, looks like that the variable with OPAQUE_TYPE cannot be all explicitly
>> initialized even at source code level.
>>
>> The only way to initialize such variable (only __vector_quad, not for
>> __vector_pairs) at source code level is through call to
>> __builtin_mma_xxsetaccz as:
>>
>> void
>> foo (__vector_quad *dst)
>> {
>> __vector_quad acc;
>> __builtin_mma_xxsetaccz(&acc);
>> *dst = acc;
>> }
>>
>> Is this the correct understanding?
>
> Correct. Or via...
>
>
>> Is there way to initialize such variable to other values than zero at source
>> code level?
>
> Not for any constant values. You can load it from memory though like below,
> which is also allowed for __vector_pair:
>
> void
> foo (__vector_quad *dst, __vector_quad *src)
> {
> __vector_quad acc;
> acc = *src;
> ...
> }
> void
> bar (__vector_pair *dst, __vector_pair *src)
> {
> __vector_pair pair;
> pair = *src;
> ...
> }
However, even with the above, the memory pointed by “src” still need to be
initialized somewhere. How to provide the initial value to the variable in the
beginning for __vector_pair type?
Qing
>
> We do not accept things like:
>
> acc = 0;
> acc = {0, 0, ... };
> etc.
>
> Peter
