The main action every compare instruction does is setting the result register X according the comparison outcome:

• -1 is set when $Y is less than $Z (or Z constant)
• 0 is set when operands are equal and
• 1 otherwise ($Y > $Z)

Note that comparison of integer and float numbers are essentially different procedures. Besides the last one additionally checks operands for NAN value and reset $X to 0 if either $Y or $Z is NAN.

Code	Mnemonic	Name	Comments
30	CMP $X, $Y, $Z	compare	compare signed value from register Y with register Z and code the result into register X
31	CMP $X, $Y, Z	compare	compare signed value from register Y with constant Z and code the result into register X
32	CMPU $X, $Y, $Z	compare unsigned	compare unsigned value from register Y with register Z and code the result into register X
33	CMPU $X, $Y, Z	compare unsigned	compare unsigned value from register Y with constant Z and code the result into register X
01	FCMP $X, $Y, $Z	floating compare	compare float values from registers Y and Z; the result is coding into register X

Examples:

• instruction CMP $1, $2, $3 compares signed integer values from registers 2 and 3, calculates sign of the difference and stored it into register 1
• instruction CMP $1, $2, 3 compares signed integer value from register 2 with number 3
• instruction FCMP $1, $2, $3 compares float values from registers 2 and 3 and codes the results to register X as described above

• signed and unsigned data
• floating point numbers

• the program using compare instruction possibilities

• arithmetic operations
• logical operations