1 2 3 4 5 6
# RV64M additions to RV32M mulw rd rs1 rs2 31..25=1 14..12=0 6..2=0x0E 1..0=3 divw rd rs1 rs2 31..25=1 14..12=4 6..2=0x0E 1..0=3 divuw rd rs1 rs2 31..25=1 14..12=5 6..2=0x0E 1..0=3 remw rd rs1 rs2 31..25=1 14..12=6 6..2=0x0E 1..0=3 remuw rd rs1 rs2 31..25=1 14..12=7 6..2=0x0E 1..0=3