[PATCH] [X86] ABI breaking change for x86-32: pass 3 vector arguments in-register instead of 4, except on Darwin

[Reid Kleckner]

I think this is definitely the right change for Linux, Darwin, and Windows.

What about the BSDs, though? They switched to clang as the system compiler some time ago. They might want either the Darwin behavior for compatibility or the standard Sys V behavior for better conformance. You should bug Ed Maste and Joerg is already CCd.


http://reviews.llvm.org/D9644

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