topperc wrote:

> > > Can we break the enabling down into more manageable pieces? I think 
> > > `enableUnalignedScalarMem() && (Subtarget->hasStdExtZbb() || 
> > > Subtarget->hasStdExtZbkb() || IsZeroCmp)` might be a good starting point.
> > 
> > 
> > I'd be fine with this type of approach.
> 
> Thanks! I have applied this suggestion. For `ExpandMemcmp` issue, I will try 
> to fix it later.

I meant we should start with only doing inline memcmp expansion under those 
conditions. Not just the overlapping loads part.

https://github.com/llvm/llvm-project/pull/107548
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