numba/numba — pull request #882 by pitrou (2014-12-05 00:54:32+00:00)
Title: Use CPU host name for code generation on the JIT codegen, and forcibly disable AVX.

I'm not sure this is a better idea than letting LLVM use the "default" CPU model (presumably some kind of generic machine model?), but intuitively it should be able to select specialized optimization rules.