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