[PATCH] D12824: [x86][WIP] CSR alignment, dead code?

[Akira Hatanaka via llvm-commits]

ahatanak added a comment.

I don't know why. It looks like it isn't really needed when the stack can't be realigned but it's updating MaxAlignment anyway.

Regarding your other question, my understanding is that when frame pointer elimination is enabled, the stack can't be realigned to spill registers because the frame pointer register is not available. If you look at X86RegisterInfo::canRealignStack, it returns true only when the frame pointer register is reserved. That doesn't happen when frame pointer elimination is enabled.


http://reviews.llvm.org/D12824