atomic_ref for vector types

[jinz2014]

Can you please suggest some solutions when the template parameter is char, ushort, int4, long4, etc for atomic_ref ? Thanks.

Reference
https://registry.khronos.org/SYCL/specs/sycl-2020/html/sycl-2020.html

The template parameter T must be one of the following types:

int,

unsigned int,

long,

unsigned long,

long long,

unsigned long long,

float, or

double.

[AlexeySachkov]

Hi @jinz2014,

For vectors you can create a wrapper function/class which simply performs per-element operation. vec::operator[] returns a reference, so it should be good enough to be passed to atomic_ref.

We have a proposed extension to enable atomic_ref for 2-byte data types: sycl_ext_oneapi_atomic16, but it is not implemented yet.

I'm not aware of any extensions for 1-byte types like char. I'm not sure if there is a good workaround except for changing data types you are using so that you can have atomic operations on them.