rocm-systems/projects/hip/docs/reference/terms.md

Table comparing syntax for different compute APIs

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.