[llvm-dev] enabling interleaved access loop vectorization

[Sanjay Patel via llvm-dev]

Is there a compile-time and/or potential runtime cost that makes
enableInterleavedAccessVectorization() default to 'false'?

I notice that this is set to true for ARM, AArch64, and PPC.

In particular, I'm wondering if there's a reason it's not enabled for x86
in relation to PR27881:
https://llvm.org/bugs/show_bug.cgi?id=27881
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