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# RV64I additions to RV32I
lwu rd rs1 imm12 14..12=6 6..2=0x00 1..0=3
ld rd rs1 imm12 14..12=3 6..2=0x00 1..0=3
sd imm12hi rs1 rs2 imm12lo 14..12=3 6..2=0x08 1..0=3
slli rd rs1 31..26=0 shamtd 14..12=1 6..2=0x04 1..0=3
srli rd rs1 31..26=0 shamtd 14..12=5 6..2=0x04 1..0=3
srai rd rs1 31..26=16 shamtd 14..12=5 6..2=0x04 1..0=3
addiw rd rs1 imm12 14..12=0 6..2=0x06 1..0=3
slliw rd rs1 31..25=0 shamtw 14..12=1 6..2=0x06 1..0=3
srliw rd rs1 31..25=0 shamtw 14..12=5 6..2=0x06 1..0=3
sraiw rd rs1 31..25=32 shamtw 14..12=5 6..2=0x06 1..0=3
addw rd rs1 rs2 31..25=0 14..12=0 6..2=0x0E 1..0=3
subw rd rs1 rs2 31..25=32 14..12=0 6..2=0x0E 1..0=3
sllw rd rs1 rs2 31..25=0 14..12=1 6..2=0x0E 1..0=3
srlw rd rs1 rs2 31..25=0 14..12=5 6..2=0x0E 1..0=3
sraw rd rs1 rs2 31..25=32 14..12=5 6..2=0x0E 1..0=3
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