c-rhodes wrote:

> Yes, this is indeed an optimization improvement, by avoiding certain 
> instances of unaligned vector load/store instructions that can sometimes have 
> bad performance.

Can you clarify how bad? The backporting criteria can be a bit ambiguous but it 
does seem to permit critical performance improvements: 
https://llvm.org/docs/HowToReleaseLLVM.html#release-patch-rules

>    Bug fix releases Patches should be limited to bug fixes or very safe and 
> critical performance improvements. Patches must maintain both API and ABI 
> compatibility with the X.1.0 release.

https://github.com/llvm/llvm-project/pull/196359
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