skachkov-sc wrote:
I think we should also check this optimization for non-byte stores, e.g.
```
define i32 @f(ptr %ptr)
%ptr1 = getelementptr inbounds i8, ptr %ptr, i64 2
store i16 0, ptr %ptr, align 2
store i16 0, ptr %ptr1, align 2
%L = load i32, ptr %ptr, align 4
```
GVN should optimize the case when 1-byte load location is fully covered with
2-byte store and extract the required byte from stored value, but it's good to
check if reconstruction of 4-byte %L can be simplified after.
https://github.com/llvm/llvm-project/pull/72364
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