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Format tables in README.md #1543

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52 changes: 26 additions & 26 deletions README.md
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Expand Up @@ -49,39 +49,39 @@ The [source code documentation](https://alpaka-group.github.io/alpaka/) is gener
Accelerator Back-ends
---------------------

|Accelerator Back-end|Lib/API|Devices|Execution strategy grid-blocks|Execution strategy block-threads|
|---|---|---|---|---|
|Serial|n/a|Host CPU (single core)|sequential|sequential (only 1 thread per block)|
|OpenMP 2.0+ blocks|OpenMP 2.0+|Host CPU (multi core)|parallel (preemptive multitasking)|sequential (only 1 thread per block)|
|OpenMP 2.0+ threads|OpenMP 2.0+|Host CPU (multi core)|sequential|parallel (preemptive multitasking)|
|OpenMP 5.0+ |OpenMP 5.0+|Host CPU (multi core)|parallel (undefined)|parallel (preemptive multitasking)|
| ||GPU|parallel (undefined)|parallel (lock-step within warps)|
|OpenACC (experimental)|OpenACC 2.0+|Host CPU (multi core)|parallel (undefined)|parallel (preemptive multitasking)|
|||GPU|parallel (undefined)|parallel (lock-step within warps)|
| std::thread | std::thread |Host CPU (multi core)|sequential|parallel (preemptive multitasking)|
| Boost.Fiber | boost::fibers::fiber |Host CPU (single core)|sequential|parallel (cooperative multitasking)|
|TBB|TBB 2.2+|Host CPU (multi core)|parallel (preemptive multitasking)|sequential (only 1 thread per block)|
|CUDA|CUDA 9.0+|NVIDIA GPUs|parallel (undefined)|parallel (lock-step within warps)|
|HIP(clang)|[HIP 4.0+](https://github.com/ROCm-Developer-Tools/HIP)|AMD GPUs |parallel (undefined)|parallel (lock-step within warps)|
| Accelerator Back-end | Lib/API | Devices | Execution strategy grid-blocks | Execution strategy block-threads |
|------------------------|---------------------------------------------------------|------------------------|------------------------------------|--------------------------------------|
| Serial | n/a | Host CPU (single core) | sequential | sequential (only 1 thread per block) |
| OpenMP 2.0+ blocks | OpenMP 2.0+ | Host CPU (multi core) | parallel (preemptive multitasking) | sequential (only 1 thread per block) |
| OpenMP 2.0+ threads | OpenMP 2.0+ | Host CPU (multi core) | sequential | parallel (preemptive multitasking) |
| OpenMP 5.0+ | OpenMP 5.0+ | Host CPU (multi core) | parallel (undefined) | parallel (preemptive multitasking) |
| | | GPU | parallel (undefined) | parallel (lock-step within warps) |
| OpenACC (experimental) | OpenACC 2.0+ | Host CPU (multi core) | parallel (undefined) | parallel (preemptive multitasking) |
| | | GPU | parallel (undefined) | parallel (lock-step within warps) |
| std::thread | std::thread | Host CPU (multi core) | sequential | parallel (preemptive multitasking) |
| Boost.Fiber | boost::fibers::fiber | Host CPU (single core) | sequential | parallel (cooperative multitasking) |
| TBB | TBB 2.2+ | Host CPU (multi core) | parallel (preemptive multitasking) | sequential (only 1 thread per block) |
| CUDA | CUDA 9.0+ | NVIDIA GPUs | parallel (undefined) | parallel (lock-step within warps) |
| HIP(clang) | [HIP 4.0+](https://github.com/ROCm-Developer-Tools/HIP) | AMD GPUs | parallel (undefined) | parallel (lock-step within warps) |


Supported Compilers
-------------------

This library uses C++17 (or newer when available).

|Accelerator Back-end|gcc 7.5 <br/> (Linux)|gcc 8.5 <br/> (Linux)|gcc 9.4 <br/> (Linux)|gcc 10.3 <br/> (Linux)|gcc 11.1 <br/> (Linux)|clang 5-7 <br/> (Linux)|clang 8-9 <br/> (Linux)|clang 10 <br/> (Linux)|clang 11 <br/> (Linux)|clang 12 <br/> (Linux)| clang 13 <br/> (Linux) |Apple LLVM 11.3.1/12.4.0/12.5.1/13.0.0 <br /> (macOS)|MSVC 2019 <br/> (Windows)|
|---|---|---|---|---|---|---|---|---|---|---|------------------------|---|---|
|Serial|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:| :white_check_mark: |:white_check_mark:|:white_check_mark:|
|OpenMP 2.0+ blocks|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:| :white_check_mark: |:x:|:white_check_mark:|
|OpenMP 2.0+ threads|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:| :white_check_mark: |:x:|:white_check_mark:|
|OpenMP 5.0 (CPU)|:x:|:x:|:x:|:x:|:x:|:x:|:x:|:x:|:white_check_mark:|:white_check_mark:| - |:x:|:x:|
| std::thread |:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:| :white_check_mark: |:white_check_mark:|:white_check_mark:|
| Boost.Fiber |:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:| :white_check_mark: |:x:|:white_check_mark:|
|TBB|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:| :white_check_mark: |:white_check_mark:|:x:|
|CUDA (nvcc)|:white_check_mark: <br/> (CUDA 11.0-11.5) |:white_check_mark: <br/> (CUDA 11.0-11.5) |:white_check_mark: <br/> (CUDA 11.0-11.5)|:white_check_mark: <br/> (CUDA 11.5)|:x:|:x:|:white_check_mark: <br/> (CUDA 11.0-11.5)|:white_check_mark: <br/> (CUDA 11.1-11.5)|:white_check_mark: <br/> (CUDA 11.4-11.5)|:white_check_mark: <br/> (CUDA 11.4-11.5)| - |:x:|:white_check_mark: <br/> (CUDA 11.2-11.5)|
|CUDA (clang) | - | - | - | - | - | - | - | :x: | :white_check_mark: <br/> (CUDA 9.2-10.1) | :white_check_mark: <br/> (CUDA 10.0-10.2) | - | - | - |
|[HIP-4.0.1](https://alpaka.readthedocs.io/en/latest/install/HIP.html) (clang)|:x:|:x:|:x:|:x:|:x:|:x:|:x:|:x:|:x:|:white_check_mark:| - | - | - |
| Accelerator Back-end | gcc 7.5 <br/> (Linux) | gcc 8.5 <br/> (Linux) | gcc 9.4 <br/> (Linux) | gcc 10.3 <br/> (Linux) | gcc 11.1 <br/> (Linux) | clang 5-7 <br/> (Linux) | clang 8-9 <br/> (Linux) | clang 10 <br/> (Linux) | clang 11 <br/> (Linux) | clang 12 <br/> (Linux) | clang 13 <br/> (Linux) | Apple LLVM 11.3.1/12.4.0/12.5.1/13.0.0 <br /> (macOS) | MSVC 2019 <br/> (Windows) |
|-------------------------------------------------------------------------------|-------------------------------------------|-------------------------------------------|-------------------------------------------|--------------------------------------|------------------------|-------------------------|-------------------------------------------|-------------------------------------------|-------------------------------------------|-------------------------------------------|-------------------------|-------------------------------------------------------|-------------------------------------------|
| Serial | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |
| OpenMP 2.0+ blocks | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :x: | :white_check_mark: |
| OpenMP 2.0+ threads | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :x: | :white_check_mark: |
| OpenMP 5.0 (CPU) | :x: | :x: | :x: | :x: | :x: | :x: | :x: | :x: | :white_check_mark: | :white_check_mark: | - | :x: | :x: |
| std::thread | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |
| Boost.Fiber | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :x: | :white_check_mark: |
| TBB | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :x: |
| CUDA (nvcc) | :white_check_mark: <br/> (CUDA 11.0-11.5) | :white_check_mark: <br/> (CUDA 11.0-11.5) | :white_check_mark: <br/> (CUDA 11.0-11.5) | :white_check_mark: <br/> (CUDA 11.5) | :x: | :x: | :white_check_mark: <br/> (CUDA 11.0-11.5) | :white_check_mark: <br/> (CUDA 11.1-11.5) | :white_check_mark: <br/> (CUDA 11.4-11.5) | :white_check_mark: <br/> (CUDA 11.4-11.5) | - | :x: | :white_check_mark: <br/> (CUDA 11.2-11.5) |
| CUDA (clang) | - | - | - | - | - | - | - | :x: | :white_check_mark: <br/> (CUDA 9.2-10.1) | :white_check_mark: <br/> (CUDA 10.0-10.2) | - | - | - |
| [HIP-4.0.1](https://alpaka.readthedocs.io/en/latest/install/HIP.html) (clang) | :x: | :x: | :x: | :x: | :x: | :x: | :x: | :x: | :x: | :white_check_mark: | - | - | - |

Other compilers or combinations marked with :x: in the table above may work but are not tested in CI and are therefore not explicitly supported.

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