This is more or less the same performance than the Radeon RX 560 or the GeForce GTX 1650: The M1 GPU has a FP32 performance of 2.6 TFLOPS ( source). See THIS PAGE for a more complete TFLOP table. The source code of GeeXLab is based on makefiles and I had no problem to compile all core libraries from the command line. I installed the latest Xcode 12.3 as well as the command line tools (because gcc/g++ are needed). By default, the compilation in command line (like gcc file.c) produces a binary for the arm64 architecture. I was surprised to see that all GeeXLab OpenGL code has been successfully compiled. OpenGL is still there in the latest macOS Big Sur! Using Xcode 12.3, you can generate a kind of hybrid executable (Apple calls it an universal macOS binary) that packs the x86_64 and arm64 code.
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