I am using atomic_add(char *ptr, (char)(-1)), and dump the result of ptr, it shows the first position is FEFF, seems like the ptr is 32bit buf , but indeed ptr is 8bit’s buf. Why the result is FEFF not FE00?

The legacy atomic builtins operate on int or unsigned int values (see OpenCL C 1.x Legacy Atomics ). The C11 atomic style builtins operate on atomic types (atomic_int, atomic_float etc.), but those are also 4 or 8 bytes in size. Given how strongly GPUs prefer to operate on 4 byte sized (and aligned…

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Opencl2.0 atomic_add only support 32bit?