Poschmann, A., Robshaw, M. J. B., Seurin, Y., & Vikkelsoe, C. (2007). PRESENT: An ultra-lightweight block cipher. RV32 RV64 Mnemonic Instruction ✓ ✓ ✓ ✓ c.srli [insns-c_srli] ✓ ✓ ✓ minu rd, rs1, rs2 Encoding