Hari Limaye dc1c00f6b1 [StackFrameLayoutAnalysis] Use target-specific hook for SP offsets (#100386) ...

StackFrameLayoutAnalysis currently calculates SP-relative offsets in a
target-independent way via MachineFrameInfo offsets. This is incorrect
for some Targets, e.g. AArch64, when there are scalable vector stack
slots.

This patch adds a virtual function to TargetFrameLowering to provide
offsets from SP, with a default implementation matching what is
currently used in StackFrameLayoutAnalysis, and refactors
StackFrameLayoutAnalysis to use this function. Only non-zero scalable
offsets are output by the analysis pass.

An implementation of this function is added for AArch64 targets, which
aims to provide correct SP offsets in most cases.

2024-07-25 09:03:48 +01:00

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