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15540 Discussions

Problem with 128Bits from RTL module and Opencl

Altera_Forum
Honored Contributor II
1,135 Views

I have an output from RTL module with 128 bits width and I want to transfert this output to global memory for print in linux terminal. 

So, I know the type of 64 bits is unsigned long and What's the type of 128 bits ? I found the type unsigned long long but The opencl guide says that these types (unsigned long long, ulong long, ulong longn: A 128-bit unsigned integer scalar and vector.) are reserved and cannot be used by applications as type names. 

Please can someone tell me What's the type I can declare in my kernel and in my cpp files ? 

I tried __global unsigned long long *restrict startx and also I tried __global ulong2 *restrict but no success ! 

What's exactly the type of 128 bits and 256bits and 512 bits that can I define in kernel.cl and API OpenCL (.cpp) ? 

Thank you.
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3 Replies
Altera_Forum
Honored Contributor II
249 Views

I think the vector should work I thought, at least from one of my own experiments. I forget the bit order that it is in. You might be able to write two 64 bits out and have it received by the vector type, it's been a while since I've built RTL so I'll need a bit more catchup.

Altera_Forum
Honored Contributor II
249 Views

I tried vector as you see (ulong2) but unfortunately doesn't work. I want to know exactly how to manage an output oven then 64 bit. If you know please give an example .  

thank you.
zjinf
New Contributor I
249 Views

How did you fix it ???? i have the same problem, but altera or intel user guide give no explain or example for it , i have 128 bit RTL output, that is 4 32 bit int for kernel, i can't received form the kernel in parallel( i want RTL parallel out), but i don't know how to write kernel code interface

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