[PATCH] D159196: [SME] Don't scavenge a spillslot in callee-save area in presence of streaming-mode changes.

[Sander de Smalen via Phabricator via llvm-commits]

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If no frame-pointer is available and the compiler has scavenged a
spill-slot in the callee-save area, the compiler may be forced to emit an
'addvl' inside the streaming-mode-changing call sequence when it needs to
fill (reload) an FP register being passed to the call.

We can avoid this entirely by disabling stack-slot scavenging when there
are streaming-mode-changing call-sequences in the function.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D159196

Files:
  llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
  llvm/test/CodeGen/AArch64/sme-disable-gisel-fisel.ll
  llvm/test/CodeGen/AArch64/sme-streaming-body.ll
  llvm/test/CodeGen/AArch64/sme-streaming-interface.ll
  llvm/test/CodeGen/AArch64/sme-streaming-mode-changing-call-disable-stackslot-scavenging.ll

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