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...RISCV privileged instructionsit[3], then merged into upstream, it might be more complex than ARM[4] please give me some hint, thanks a lot! [1] http://llvm.org/devmtg/2017-10/#tutorial2 [2] https://github.com/riscv/riscv-isa-manual/blob/master/src/machine.tex#L539 [3] https://reviews.llvm.org/D40383 [4] https://github.com/llvm-mirror/llvm/blob/master/lib/Target/ARM/ARMCallLowering.cpp#L280 -- Regards, Leslie Zhai - https://reviews.llvm.org/p/xiangzhai/