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ArmDeveloperEcosystem / arm-learning-paths

Arm Learning Paths: a repository of how-to content for software developers
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Accessing elements of a matrix row_wise using SVE. #905

Open AjaySingh40 opened 2 months ago

AjaySingh40 commented 2 months ago

Hello all, Is it possible to access elements of a matrix row wise using sve. If yes please provide the link for the docs or help me with that . I didn't find any document for that. Thank You.

jasonrandrews commented 2 months ago

Checking for some info. Also shared on Arm Discord.

solidpixel commented 1 month ago

For a non-sequential load you would need to use gathers, which SVE supports. This will be less efficient than sequential loads, so it's often faster to transpose an input matrix to avoid the need for gathers.

The best way of transposing depends on what you are doing - transposing blocks that fit into the cache would be better than transposing a whole matrix that spills out of the cache, for example.