[llvm] [SROA] Allow rewriting memcpy depending on tbaa.struct (PR #77597)

[Björn Pettersson via llvm-commits]

bjope wrote:

I guess tbaa.stuct mainly is intended to show where padding bytes are inserted. But I don't have any better idea for how to identify the bit padding here unless doing it like this.

https://github.com/llvm/llvm-project/pull/77597