> The Open CL 1.2 barrier() function is threadgroup scope, same as threadgroup_barrier on Metal Interestingly, the Apple driver seems to have that screwed up,

> The Open CL 1.2 barrier() function is threadgroup scope, same as threadgroup_barrier on Metal Interestingly, the Apple driver seems to have that screwed up, with giving much stronger semantics than necessary... #define _AIR_MEM_SCOPE_WORK_GROUP 0x2 in the OpenCL header And for metal_types.h... #define _AIR_MEM_SCOPE_WORK_GROUP 0x1 #define _AIR_MEM_SCOPE_DEVICE 0x2 Which made me have even more questions, that's why I couldn't give a straight answer earlier. > OpenCL has been deprecated for over 3 years The OpenCL implementation using AIR is new, for Apple Silicon.