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Floating opcodes
The following table shows the opcodes that pop two floating-point
values from the top of the stack, add them, and push the result. The
type of the values is indicated by the opcode itself, and the result
always has the same type as the numbers being added. No exceptions are
thrown by these opcodes. Overflow results in a positive or negative
infinity, and underflow results in a positive or negative zero.
| Opcode | Operand(s) | Description |
|---|---|---|
| fadd | (none) | pops two floats, adds them, and pushes the float result |
| dadd | (none) | pops two doubles, adds them, and pushes the double result |
Subtraction is performed on floats and doubles via the following opcodes. Each opcode causes the top two values of the appropriate type to be popped off the stack. The topmost value is subtracted from the value just beneath the topmost value. The result is pushed back onto the stack. No exceptions are thrown by either of these opcodes.
| Opcode | Operand(s) | Description |
|---|---|---|
| fsub | (none) | pops two floats, subtracts them, and pushes the float result |
| dsub | (none) | pops two doubles, subtracts them, and pushes the double result |
Multiplication of floats and doubles is accomplished via the following opcodes. Each opcode causes two values of the same type to be popped off the stack and multiplied. The result, of the same type as the numbers being multiplied, is pushed back onto the stack. No exceptions are thrown.
| Opcode | Operand(s) | Description |
|---|---|---|
| fmul | (none) | pops two floats, multiplies them, and pushes the float result |
| dmul | (none) | pops two doubles, multiplies them, and pushes the double result |
The division experience is made available for floats and doubles by the following opcodes. The division opcodes cause the top two values of the appropriate type to be popped off the stack. The topmost value is divided by the value immediately beneath the topmost value. The result is pushed onto the stack. Floating-point division of a finite value by zero yields a positive or negative infinity. Floating-point division of zero by zero yields NaN. No exception is thrown as a result of any floating-point division.
| Opcode | Operand(s) | Description |
|---|---|---|
| fdiv | (none) | pops two floats, divides them, and pushes the float result |
| ddiv | (none) | pops two doubles, divides them, and pushes the double result |
The remainder operation is accomplished via the following opcodes on floats and doubles. The following opcodes cause the top two values to be popped from the stack. The topmost value is divided by the value just beneath it, and the remainder of that division is pushed back onto the stack. Floating-point remainder of any value divided by zero yields a NaN result. No exception is thrown as a result of any floating-point division.
| Opcode | Operand(s) | Description |
|---|---|---|
| frem | (none) | pops two floats, divides them, and pushes the float remainder |
| drem | (none) | pops two doubles, divides them, and pushes the double remainder |
The following opcodes perform arithmetic negation on floats and doubles. Negation opcodes pop the top value from the stack, negates it, and pushes the result.
| Opcode | Operand(s) | Description |
|---|---|---|
| fneg | (none) | pops a float, negates it, and pushes the result |
| dneg | (none) | pops a double, negates it, and pushes the result |
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