1# RV64D additions to RV32D
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3fcvt.l.d  rd rs1 24..20=2 31..27=0x18 rm       26..25=1 6..2=0x14 1..0=3
4fcvt.lu.d rd rs1 24..20=3 31..27=0x18 rm       26..25=1 6..2=0x14 1..0=3
5fmv.x.d   rd rs1 24..20=0 31..27=0x1C 14..12=0 26..25=1 6..2=0x14 1..0=3
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7fcvt.d.l  rd rs1 24..20=2 31..27=0x1A rm       26..25=1 6..2=0x14 1..0=3
8fcvt.d.lu rd rs1 24..20=3 31..27=0x1A rm       26..25=1 6..2=0x14 1..0=3
9fmv.d.x   rd rs1 24..20=0 31..27=0x1E 14..12=0 26..25=1 6..2=0x14 1..0=3
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