SIMD Support
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SSE2 was introduced in 2001. If you have a CPU which doesn't support it you will have to compile FlightGear with -DENABLE_SIMD=OFF. But those are extremely rare these days and running FlightGear on them will be a pain anyhow.[1]
Erik is experimenting with streamlined Canvas rendering using Single Instruction Multiple Data (SIMD) instructions which is able to calculate on 4 floating poit variables simultaneously (e.g 3 or 4 value vectors). For the F-16 map this gives a speedup from 12+ seconds delay rendering at the first select down to 6 seconds delay.[2] [3]
A few users have reported a noticeable increase in framerate on their computers, e.g. on some desktop the framerate has doubled[4].
SSE and NEON work best when considered in the design stage. Adding it afterwards is always suboptimal. Thus, Erik might still update it in a place or two but this work isn't intended to detract from adding Skia.[5]
References
References
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