Term	CUDA	HIP	OpenCL
Device	`int deviceId`	`int deviceId`	`cl_device`
Queue	`cudaStream_t`	`hipStream_t`	`cl_command_queue`
Event	`cudaEvent_t`	`hipEvent_t`	`cl_event`
Memory	`void *`	`void *`	`cl_mem`

	grid	grid	NDRange
	block	block	work-group
	thread	thread	work-item
	warp	warp	sub-group

Thread- index	threadIdx.x	threadIdx.x	get_local_id(0)
Block- index	blockIdx.x	blockIdx.x	get_group_id(0)
Block- dim	blockDim.x	blockDim.x	get_local_size(0)
Grid-dim	gridDim.x	gridDim.x	get_num_groups(0)

Device Kernel	`__global__`	`__global__`	`__kernel`
Device Function	`__device__`	`__device__`	Implied in device compilation
Host Function	`__host_` (default)	`__host_` (default)	Implied in host compilation
Host + Device Function	`__host__` `__device__`	`__host__` `__device__`	No equivalent
Kernel Launch	`<<< >>>`	`hipLaunchKernel`/`hipLaunchKernelGGL`/`<<< >>>`	`clEnqueueNDRangeKernel`

|||||| |Global Memory|__global__|__global__|__global| |Group Memory|__shared__|__shared__|__local| |Constant|__constant__|__constant__|__constant| |||||| ||__syncthreads|__syncthreads|barrier(CLK_LOCAL_MEMFENCE)| |Atomic Builtins|atomicAdd|atomicAdd|atomic_add| |Precise Math|cos(f)|cos(f)|cos(f)| |Fast Math|__cos(f)|__cos(f)|native_cos(f)| |Vector|float4|float4|float4|

Notes

The indexing functions (starting with thread-index) show the terminology for a 1D grid. Some APIs use reverse order of xyz / 012 indexing for 3D grids.