RFC arm64: Scalable Vector Extension core support
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Cover letter [RFC PATCH 00/29] arm64: Scalable Vector Extension core support
Quoted 4 lines · Dave Martin
For setcontext/setjmp, we don't save/restore any SVE state due to the caller-save status of SVE, and I would not consider it necessary to save/restore VL itself because of the no-change-on-the-fly policy for this.
the problem is not changing VL within a thread, but that setcontext can resume a context of a different thread which had different VL and there might be SVE regs spilled on the stack according to that.
(i consider this usage undefined, but at least the gccgo runtime does this)