OpenCL C++ kernel language
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1 Copyright Khronos Group Page 1 OpenCL C++ kernel language Vienna April 2016 Adam Stański Bartosz Sochacki
2 Copyright Khronos Group Page 2 OpenCL 2.2 OpenCL C++ Open source free compiler SPIR-V 1.1 API
3 Copyright Khronos Group Page 3 What is OCL C++ C++14 based Portable Generic Flexible
4 Copyright Khronos Group Page 4 C++14 Based The same grammar Small restrictions and extensions Subset of C++14 STL headers Language constructions specific for C++14
5 Copyright Khronos Group Page 5 Standard library Large set of headers Features from OpenCL 2.0 C C++14
6 Copyright Khronos Group Page 6 Generic & Flexible Allows interfacing Passing functors Meta programming Encapsulation
7 Copyright Khronos Group Page 7 Design focus In the spirit of C++ Ease of porting from OCL C Easily extensible with libraries C++ standard library additions Alignment with SYCL
8 Copyright Khronos Group Page 8 Compile time Templates Type traits Type safety
9 Copyright Khronos Group Page 9 Encapsulation Classes Interfacing Lambdas
10 Copyright Khronos Group Page 10 Restrictions and limitations Function pointers Polymorphism Dynamic allocations Recursive functions Exceptions RTTI
11 Copyright Khronos Group Page 11 Function pointers Lack of hardware support Compatibility reasons Good news: We have functors
12 Copyright Khronos Group Page 12 Polymorphism V-tables use function pointers Good news: CRTP works
13 Copyright Khronos Group Page 13 Dynamic allocations Compatibility reasons Lack of hardware support Runtime API changes Good news: Placement new and delete work
14 Copyright Khronos Group Page 14 Recursive functions Lack of physical stack Inlining Good news Constexpr recursion works as in C++14
15 Copyright Khronos Group Page 15 Exceptions and RTTI Various performance problems Lack of hardware support for exceptions
16 Copyright Khronos Group Page 16 Extensions Built in vectors New attributes Address spaces Built in half type
17 Copyright Khronos Group Page 17 Built in vector types Known from OpenCL C Extended construction Vector helper library
18 Copyright Khronos Group Page 18 New attributes Compiler information max_size required_num_sub_groups ivdep
19 Copyright Khronos Group Page 19 Address spaces Similar to OpenCL C address spaces Implicit Templates can be specialized on them Separate library
20 Copyright Khronos Group Page 20 Half type 16bit floating point type Native support is provided via extension Without support arithmetic on half is emulated
21 Copyright Khronos Group Page 21 What s new in comparison to OpenCL C Standard library Templates Classes Lambdas
22 Copyright Khronos Group Page 22 Standard library from C++ opencl_type_traits opencl_array opencl_atomic opencl_functional opencl_limits opencl_iterator opencl_tuple opencl_def
23 Standard library from OpenCL C opencl_image opencl_common opencl_convert opencl_device_queue opencl_geometric opencl_integer opencl_pipe opencl_printf opencl_relational opencl_synchronization opencl_vector_load_store opencl_work_group opencl_work_item opencl_reinterpret opencl_math Copyright Khronos Group Page 23
24 Copyright Khronos Group Page 24 Standard library opencl_memory opencl_half opencl_vector_utility opencl_range opencl_marker opencl_math_constants opencl_vector
25 Copyright Khronos Group Page 25 Templates, Classes & Lambdas Compatible with C++14 standard
26 Copyright Khronos Group Page 26 New in OpenCL Pipe storage Non trivial construction and destruction of the global memory objects in program scope Program scope local memory New attributes
27 Copyright Khronos Group Page 27 Facelifted features from OpenCL C Images & Samplers Pipes Device enqueue Address spaces All builtins
28 Copyright Khronos Group Page 28 Images, Samplers & Pipes Type safe Various useful typedefs Compile time information Reduce undefined behavior
29 Copyright Khronos Group Page 29 Device enqueue Type safe Less restrictive Simpler syntax
30 Copyright Khronos Group Page 30 Address spaces Class like interface Possible specialization
31 Copyright Khronos Group Page 31 Builtin functions Many are templated Split into headers
32 The end Copyright Khronos Group Page 32
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