The floating-point arithmetic instruction (FNC110-FNC1320) is used to process floating-point numbers, which are 32 digits and contain 13 instructions such as floating-point number comparison, transformation, four-rule operation, open-squared operation and trigonometric function.
All floating-point number processing instructions are 32-bit instructions, and it is necessary to prefix the mnemonic of most instructions with the identifier "D" of the 32-bit operation.
They are scattered among the directive numbers FNC110 - FNC119, FNC120 - FNC129, FNC130 - FNC139.
Binary floating-point number comparison instruction ECMP
(1) Binary floating-point number comparison instruction ECMP(FNC110) DECMP(P) instruction
The two source operands are compared, and the results of the comparison are reflected in the policy operands. If the operand is constant, it is actively converted to binary floating-point value processing.
The source operands of this command can be K, H, and D, and the policy operands can be Y, M, and S. It is a 32-bit operation instruction, accounting for 17 program steps.
Binary floating-point interval comparison instruction EZCP
(2) Binary floating-point interval comparison instruction EZCP(FNC111) The function of the EZCP(P) instruction is to compare the content of the source operand with the scale of the upper and lower two points specified by the binary floating-point value, and the corresponding result is reflected in the policy operands with ON/OFF. This instruction is a 32-bit operation instruction, accounting for 17 program steps. Source operands can be K, H, and D; The policy operands are Y, M and S. [S1.] should be less than [S2.], and when the operand is constant, it will be actively converted to binary floating-point value.
Addition instruction EADD
Subtraction instruction ESUB
Multiplication instruction EMVL
Division instruction EDIV
(3) Four operation instructions for binary floating-point numbers There are four operation instructions for floating-point numbers: addition instruction EADD (FNC120), subtraction instruction ESUB (FNC121), multiplication instruction EMVL (FNC122) and division instruction EDIV (FNC123). Instructions for the use of the four operation instructions, which are all to feed the floating-point number in the two source operands into the policy operand. When the divisor is 0, there is an arithmetic error, and the instruction is not executed. This type of instruction has only 32 bits of arithmetic and accounts for 13 program steps. The result of the calculation affects the flag M8020 (zero flag), M8021 (borrow flag), and M8022 (carry flag). The source operands can be K, H, and D, and the policy operands are D. If there is a constant involved in the operation, it is actively converted to a floating-point number.
Binary floating-point arithmetic also has instructions such as open squared and trigonometric function operations, which are not explained here.
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