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ca5d75ffa1
Implement the spills/fills of callee-saved SVE registers using STR and LDR instructions. Also adds the `aarch64_sve_vector_pcs` attribute to specify the callee-saved registers to be used for functions that return SVE vectors or take SVE vectors as arguments. The callee-saved registers are vector registers z8-z23 and predicate registers p4-p15. The overal frame-layout with SVE will be as follows: +-------------+ | stack args | +-------------+ | Callee Saves| | X29, X30 | |-------------| <- FP | SVE Callee | < ////////////// | saved regs | < ////////////// | z23 | < ////////////// | : | < // SCALABLE // | z8 | < ////////////// | p15 | < /// STACK //// | : | < ////////////// | p4 | < //// AREA //// +-------------+ < ////////////// | : | < ////////////// | SVE locals | < ////////////// | : | < ////////////// +-------------+ |/////////////| alignment gap. | : | | Stack objs | | : | +-------------+ <- SP after call and frame-setup Reviewers: cameron.mcinally, efriedma, greened, thegameg, ostannard, rengolin Reviewed By: ostannard Differential Revision: https://reviews.llvm.org/D68996
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