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Altera_Forum's avatar
Altera_Forum
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20 years ago

custom instructions

Is there an easy way to write custom instructions which read and write to SDRAM? In particular, we're trying to make an compare-and-swap instruction in order to do multi-threading. Als...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

Basically, in order to do multi-threading safely and efficiently, you need to have some instruction which can read from a location in memory, do something to it, and write the result back to the same location in memory. The functions can vary -- add, decrement, compare and swap; it's not so important as being able to have an atomic load-operate-store instruction.

Also, one needs this for simd instructions like vector or matrix multiplications.