[clang] [llvm] [SROA] Vector promote some memsets (PR #133301)

[Matt Arsenault via cfe-commits]

arsenm wrote:

> and that's why you want to have single element loads that get inserted into a vector and then perform sub-vector extracts on it?

We care about eliminate stack usage at any cost. Big load are always better, even if not naturally aligned. When we do care about alignment, we only care about align > 4, we don't care about the actual type alignment.



https://github.com/llvm/llvm-project/pull/133301