Reverse Engineering Qualcomm's Undocumented NPU Compiler Reveals Hidden Features
By
Sagnik Bhattacharjee
Summary
The author reverse-engineered Qualcomm's NPU (Neural Processing Unit) compiler to uncover undocumented features including an optimization solver, secret precision rewrites, and a simulator that Qualcomm doesn't publicly mention. Frustrated by the lack of documentation for NPU development, the author took matters into their own hands to understand memory capacities (like VTCMs) and compiler behavior, enabling better edge deployment of machine learning models on Qualcomm SoCs.
Source
bskyReverse Engineering Qualcomm's Undocumented NPU Compiler Reveals Hidden Featuresdatavorous.github.ioKey quotes
· 3 pulledNPU documentation on the web is basically nonexistent, and the little that's out there was so disappointing that at one point I thought of quitting - so I reverse engineered the compiler instead.
For none of the SoC's did Qualcomm publish the memory capacity of VTCMs. How am I supposed to understand whether my tensors were spilling all over?
I reverse engineered the Qualcomm NPU compiler to find out about an optimization solver, secret precision rewrites, and a simulator nobody mentions.
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