Py-Videocore: Python Library for GPGPU on Raspberry Pi

Re:Py-Videocore: Python Library for GPGPU on Raspberry Pi by david-given on Sunday December 27, 2015 @02:58PM (#10798546)

Shader units --- e.g. the VideoCore's QPUs, which this project is targeting --- are very very weird. Compiling C into them basically isn't possible. They don't really do memory accesses, for example.

The VideoCore's own processor, commonly referred to as the VPU or just the VC4, is a perfectly normal architecture with its own vector unit and DSP addons. C can compile into that perfectly easily, and the real-time OS that runs on it alongside Linux is written in it, but there aren't any adequate open source C compilers yet.

More info on the QPU here:

https://github.com/hermanhermitage/videocoreiv-qpu

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Re:Py-Videocore: Python Library for GPGPU on Raspberry Pi by SeanDav on Sunday December 27, 2015 @03:01PM (#10798560)

Disclaimer: I know nothing about the issues, but would using C with inline assembly gain anything?

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Re:Py-Videocore: Python Library for GPGPU on Raspberry Pi by belleandsebasti on Sunday December 27, 2015 @05:05PM (#10798926)

No. Inline assembly is a static construct targeting the same compute unit as the C code during compile-time.

What is needed is "runtime inline assembly" which assembles inline assembly for a different target architecture at runtime.

This is essentially what shader programs are and you don't need special syntax to support it. Just store your shader program in a char* and bundle an assembler/compiler with your host program.

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