[llvm] [SLP]Vectorize gathered loads (PR #107461)

[Alexey Bataev via llvm-commits]

alexey-bataev wrote:

> > For info, I've bisected (what I think is) a miscompile to this patch. I'm trying to extract some kind of reproducer.
> 
> Reproducer:
> 
> ```
> clang bbi-100697.c -O2 -std=c23
> ./a.out
> ```
> 
> After [1833d41](https://github.com/llvm/llvm-project/commit/1833d418a04123916c1dbeb0c41c8bc7d06b779b) this results in
> 
> ```
> Fail!
> ```
> 
> and before it results in
> 
> ```
> Pass!
> ```
> 
> I have no idea what goes wrong, if SLP does anything bad or if it just triggers a bug in some later pass. The input was originally part of a much larger test so I've reduced it a lot but unfortunately it's still quite large (and ugly).
> 
> [bbi-100697.c.gz](https://github.com/user-attachments/files/17572329/bbi-100697.c.gz)

Thanks, I will check it ASAP

https://github.com/llvm/llvm-project/pull/107461