Implement Multi-Array Concatenation using Memory Segment Copy

[mikepapadim]

Description

This pull request introduces a new method concat to multiple instances of TornadoNativeArray types into a single array. This aims at providing a straightforward and efficient way to merge several arrays by using Memory Segment copies and without the overhead of manual array copying.

Example usage:

  IntArray a = new IntArray(numElements);
  IntArray b = new IntArray(numElements);
  IntArray e = new IntArray(numElements);

  a.init(100);
  b.init(5);
  e.init(12);

  IntArray c = IntArray.concat(a, b, e);

Example size output;

Array a size: 256
Array b size: 256
Array e size: 256
---------------------------------
Concat Array c size: 768
---------------------------------

Backend/s tested

Mark the backends affected by this PR.

• OpenCL
• PTX
• SPIRV

OS tested

Mark the OS where this PR is tested.

• Linux
• OSx
• Windows

Did you check on FPGAs?

If it is applicable, check your changes on FPGAs.

• Yes
• No

How to test the new patch?

make jdk21 backend=opencl
tornado-test -V --fast uk.ac.manchester.tornado.unittests.api.TestConcat

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[jjfumero]

Nice to have this method.

[mikepapadim]

Nice to have this method.

Nice to have this method.

Thanks. Are there any specific comments to fix?

[jjfumero]

Sorry, I pressed the wrong option. No, nothing to fix from my side. It looks good,

[stratika]

LGTM, just a small suggestion in a comment