DIV DIVIDE
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Purpose |
perform arithmetic division |
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Format |
opcode divr.rx, quo.mx 2 operand opcode divr.rx, divd.rx, quo.wx 3 operand |
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Operation |
quo ß quo / divr; 2 operand quo ß divd / divr; 3 operand |
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Condition codes |
N ß quo LSS 0; Z ß quo EQL 0; V ß {overflow} OR {divr EQL 0}; C ß 0; |
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Exceptions |
Integer overflow Divide by zero Floating overflow Floating underflow Reserved operand |
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Opcodes |
86 DIVB2 Divide Byte 2 Operand 87 DIVB3 Divide Byte 3 Operand A6 DIVW2 Divide Word 2 Operand A7 DIVW3 Divide Word 3 Operand C6 DIVL2 Divide Long 2 Operand 07 DIVL3 Divide Long 3 Operand 46 DIVF2 Divide Floating 2 Operand 47 DIVF3 Divide Floating 3 Operand 66 DIVD2 Divide Double 2 Operand 67 DIVD3 Divide Double 3 Operand |
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Description |
In 2 operand format, the quotient operand is divided by the divisor operand and the quotient operand is replaced by the result. In 3 operand format, the dividend operand is divided by the divisor operand and the quotient operand is replaced by the result. In floating format, the quotient operand result is rounded for both 2 and 3 operand format. |
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Notes |
1. Integer division is performed such that the remainder (unless it is zero) has the same sign as the dividend; i.e., the result is truncated towards 0. 2. Integer overflow occurs if and only if the largest negative integer is divided by -1. On overflow, operands are affected as in 3 below. 3. In the integer divisor operand is 0, then in 2 operand integer format, the quotient operand is not affected; in 3 operand format the quotient operand is replaced by the dividend operand. 4. On a floating reserved operand fault, the quotient operand is unaffected and the condition codes are un predictable. 5. On floating underflow, the quotient operand is replaced by 0. 6. On floating divide by zero or on floating overflow the quotient operand is replaced by an operand of all bits 0 except for a sign bit of 1 (a reserved operand). N ß 1; Z ß 0; V ß 1; and C ß 0. |