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What is the most effective way to copy subsets of arrays between local and global memory?

WWP00
Beginner
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For example, suppose we have a local memory array:

 

float local[10];

 

And a much larger, global memory array. Would we copy like:

 

int memStart = 50;

for (int i = 0; i < 10; ++i)

         local[i] = globalMem[memStart + i];

 

Or should we use #pragma unroll for this copy, to avoid making the loop take one clock cycle per copy? Or is there some other recommended way to move array data between local and global memory?

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Kenny_Tan
Moderator
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Hi, You may found information here: https://stackoverflow.com/questions/20616844/how-to-transfer-array-data-in-vhdl I would suggest you post it to there as it involve IEEE std. Thanks
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WWP00
Beginner
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Sorry, I meant in Intel's OpenCL for FPGAs, not in RTL.

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Kenny_Tan
Moderator
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You can refer to https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/opencl-sdk/archives/aocl-best-practices-guide-15.1.pdf page 1-47.

Transferring Loop-Carried Dependency to Local Memory 

 

For more queries, can you put this to the correct category fall under open cl? https://forums.intel.com/s/topic/0TO0P0000001AUUWA2/intel-high-level-design

 

Thanks

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