Proposed frsqrt Instruction Encoding
====================================

+-----------+---------+-------+-----+--------+----+---------+
| Mnemonic  | funct7  | rs2   | rs1 | funct3 | rd | opcode  |
+===========+=========+=======+=====+========+====+=========+
| frsqrt.s  | 0111100 | 00000 | rs1 | rm     | rd | 1010011 |
+-----------+---------+-------+-----+--------+----+---------+
| frsqrt.d  | 0111101 | 00000 | rs1 | rm     | rd | 1010011 |
+-----------+---------+-------+-----+--------+----+---------+
| frsqrt.q  | 0111110 | 00000 | rs1 | rm     | rd | 1010011 |
+-----------+---------+-------+-----+--------+----+---------+
| frsqrt.h  | 0111111 | 00000 | rs1 | rm     | rd | 1010011 |
+-----------+---------+-------+-----+--------+----+---------+