[llvm] [AMDPU] More support for SILoadStoreOptimizer of buffer instructions (PR #86285)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Can't do the merging on buffer_load_format since the format isn't known at compile time.

But that's all this does? 

https://github.com/llvm/llvm-project/pull/86285