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mockingbirdnest / Principia

𝑛-Body and Extended Body Gravitation for Kerbal Space Program
MIT License
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Use AVX if available #3019

Open eggrobin opened 3 years ago

eggrobin commented 3 years ago

Because of different alignment requirements and VEX encoding/VZEROUPPER woes, and because it would be so low-level and pervasive (we cannot gate every operation on R3Element behind a CPUID test) we need a separate DLL for that, with an intermediate layer that chooses which one to use based on CPUID.

We could generate the intermediate layer from journal.proto, and LoadLibrary/GetProcAddress etc.

This blocks FMA usage on Linux & macOS, see https://github.com/mockingbirdnest/Principia/pull/3010#issuecomment-851077178.

Growflavor commented 2 years ago

just curious: is this relevant only for Linux & macOS? Or is there something here that might also be useful as an alternative to FMA3 on Windows 10 machines with older chips? For users like me who are stuck (for a few more years) with Ivy-Bridge processors that support AVX but not FMA3/AVX2: IvyBridge