Hello. It's a hairy code, but Richard added in 90e4755aeeb129a7d77334596bc7853ca7b95c67: $ git show 90e4755aeeb129a7d77334596bc7853ca7b95c67 | grep expdz + {"expdz", 0xee7081e0, 3, FPU_FPA_EXT_V1, do_fpa_monadic}, + {"expdz", 0xee788160, 3, FPU_FPA_EXT_V1, do_fpa_monadic}, So the instruction has 2 opcodes. Is it a typo? Thanks, Martin