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ufff .... found a detailed description about Classify Instruction
Not mentioned in
https://www.cs.sfu.ca/~ashriram/Courses/CS295/assets/notebooks/RISCV/RISCV_CARD.pdf
but in detail in
https://riscv.org/wp-content/uploads/2019/06/riscv-spec.pdf
Single-Precision Floating-Point Classify Instruction
0 rs1 is −∞.
1 rs1 is a negative normal number.
2 rs1 is a negative subnormal number.
3 rs1 is −0.
4 rs1 is +0.
5 rs1 is a positive subnormal number.
6 rs1 is a positive normal number.
7 rs1 is +∞.
8 rs1 is a signaling NaN.
9 rs1 is a quiet NaN.
