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ufff .... found a detailed description about Classify Instruction

Not mentioned in
cs.sfu.ca/~ashriram/Courses/CS

but in detail in

riscv.org/wp-content/uploads/2

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.

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