Proposal: Build x86_64 release packages for different microarch levels (2596)

[GalacticEmperor1]

Issue №2596 opened by robertpfeiffer at 2021-05-20 15:52:17

Instead of building one x86_64 wheel, we can build wheels with for x86_64, x86_64-v2, x86_64-v3, and x86_64-v4. These levels have been standardised between GCC and clang: https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html https://www.phoronix.com/scan.php?page=news_item&px=GCC-11-x86-64-Feature-Levels

Reasons against this:

1. It needs to be supported by pip, or the user has to download the correct wheel by hand
2. PyInstaller might produce binaries that require a higher microarchitecture level than desired

Reasons for this:

1. It's easy enough to build the release wheels with four different -march= cflags.
2. Trusting the compiler to do better code generation everywhere
3. This can co-exist with CPU dispatch for "hot" code paths

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Comments

# # robertpfeiffer commented at 2021-05-24 08:58:00

For extra style points, we could build the packaged SDL2 with the same settings