[llvm] [llvm] Optimize misaligned accesses with early profitable splitting (PR #145168)

[Acthinks Yang via llvm-commits]

Acthinks wrote:

> > This is a good idea, but I still have the following questions: 1. MMO BaseAlign corresponds to IR Value, and MPI Offset is a constant. In order to obtain the optimal align info, we may need a new base + offset and introduce a new IR Value, which seems inappropriate.
> 
> It's not necessary to introduce a new IR value, it already exists: It's the pointer operand of a constant offset GEP.
> 

I mean, maybe in some cases it is not possible to directly get the appropriate base value, they may not be optimally aligned, or the offset may be negative.



https://github.com/llvm/llvm-project/pull/145168