1fcvt.h.d  rd rs1 24..20=1 31..27=0x08 rm       26..25=2 6..2=0x14 1..0=3
2fcvt.d.h  rd rs1 24..20=2 31..27=0x08 rm       26..25=1 6..2=0x14 1..0=3
3