[llvm-branch-commits] [llvm] [AArch64][SME] Support Windows/stack probes in MachineSMEABIPass (PR #149063)

[Eli Friedman via llvm-branch-commits]

efriedma-quic wrote:

I'll restate:

On Windows, there are guard pages, so you have to grow the stack one page at a time.  There are two ways to do this: __chkstk, or explicit memory accesses.  __chkstk is faster for large allocations because it caches the size of the stack. LLVM currently relies explicit accesses for prologues that allocate less than one page, and __chkstk for all other allocations.  But the ABI doesn't require that; we can use whatever mix we want.

https://github.com/llvm/llvm-project/pull/149063