Sander de Smalen 702c3f56d3 [SME] Don't scavenge a spillslot in callee-save area in presence of streaming-mode changes. ...

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.

Reviewed By: david-arm

Differential Revision: https://reviews.llvm.org/D159196

2023-09-04 10:14:44 +00:00

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