| Op Code (Hex) | Extender | Operand 1 | Operand 2 | Operand 3 | Operand [4-7] |
|---|---|---|---|---|---|
| DIV 104F |
| Quotient | Dividend | Divisor |
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| DIVR 124F |
| Quotient | Dividend | Divisor |
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| DIVI 184F | Indicator options | Quotient | Dividend | Divisor | Indicator targets |
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| DIVIR 1A4F | Indicator options | Quotient | Dividend | Divisor | Indicator targets |
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| DIVB 1C4F | Branch options | Quotient | Dividend | Divisor | Branch targets |
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| DIVBR 1E4F | Branch options | Quotient | Dividend | Divisor | Branch targets |
Operand 1: Numeric variable scalar.
Operand 2: Numeric scalar.
Operand 3: Numeric scalar.
Operand 4-7:
| Op Code (Hex) | Extender | Operand 1 | Operand 2 | Operand [3-6] |
|---|---|---|---|---|
| DIVS 114F |
| Quotient/Dividend | Divisor |
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| DIVSR 134F |
| Quotient/Dividend | Divisor |
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| DIVIS 194F | Indicator options | Quotient/Dividend | Divisor | Indicator targets |
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| DIVISR 1B4F | Indicator options | Quotient/Dividend | Divisor | Indicator targets |
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| DIVBS 1D4F | Branch options | Quotient/Dividend | Divisor | Branch targets |
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| DIVBSR 1F4F | Branch options | Quotient/Dividend | Divisor | Branch targets |
Operand 1: Numeric variable scalar.
Operand 2: Numeric scalar.
Operand 3-6:
Description: The quotient is the result of dividing the dividend by the divisor.
Operands can have floating-point, packed or zoned decimal, signed or unsigned binary type.
Source operands are the dividend and divisor. The receiver operand is the quotient.
If operands are not of the same type, source operands are converted according to the following rules:
Source operands are divided according to their type. Floating point operands are divided using floating point division. Packed decimal operands are divided using packed decimal division. Unsigned binary division is used with unsigned source operands. Signed binary operands are divided using two's complement binary division.
Better performance can be obtained if all operands have the same type. Signed and unsigned binary division execute faster than either packed decimal or floating point division.
All of the operands must be numeric with any implicit conversions occurring according to the rules of arithmetic operations as outlined in Arithmetic Operations.
Decimal operands used in floating-point operations cannot contain more than 15 total digit positions.
If the divisor has a numeric value of zero, a zero divide (hex 0C0B) exception or floating-point zero divide (hex 0C0E) exception is signaled respectively for fixed-point versus floating-point operations. If the dividend has a value of zero, the result of the division is a zero quotient value.
For a decimal operation, the precision of the result of the divide operation is determined by the number of fractional digit positions specified for the quotient. In other words, the divide operation will be performed so as to calculate a resultant quotient of the same precision as that specified for the quotient operand. If necessary, internal alignment of the assumed decimal point for the dividend and divisor operands is performed to ensure the correct precision for the resultant quotient value. These internal alignments are not subject to detection of the decimal point alignment exception. An internal quotient value will be calculated for any combination of decimal attributes which may be specified for the instruction's operands. However, the assignment of the result to the quotient operand is subject to detection of the size (hex 0C0A) exception thereby limiting the assignment to, at most, the rightmost 31 digits of the calculated result.
Floating-point division uses exponent subtraction and significand division.
If the dividend operand is shorter than the divisor operand, it is logically adjusted to the length of the divisor operand.
For fixed-point computations and for the significand division of a floating-point computation, the division operation is performed according to the rules of algebra. Unsigned binary is treated as a positive number for the algebra.
For a floating-point computation, the operation is performed as if to infinite precision.
The result of the operation is copied into the quotient operand. If this operand is not the same type as that used in performing the operation, the resultant value is converted to its type. If necessary, the resultant value is adjusted to the length of the quotient operand, aligned at the assumed decimal point of the quotient operand, or both before being copied to it. Length adjustment and decimal point alignment are performed according to the rules for arithmetic operations as outlined in Arithmetic Operations. If significant digits are truncated on the left end of the resultant value, a size (hex 0C0A) exception is signaled.
If a decimal to binary conversion causes a size (hex 0C0A) exception to be signaled, the binary value contains the correct truncated result only if the decimal value contains 15 or fewer significant nonfractional digits.
For the optional round form of the instruction, specification of a floating-point receiver operand is invalid.
For fixed-point operations in programs that request to be notified of size (hex 0C0A) exceptions, if nonzero digits are truncated from the left end of the resultant value, a size (hex 0C0A) exception is signaled.
For floating-point operations that involve a fixed-point receiver field, if nonzero digits would be truncated from the left end of the resultant value, an invalid floating-point conversion (hex 0C0C) exception is signaled.
For a floating-point quotient operand, if the exponent of the resultant value is either too large or too small to be represented in the quotient field, the floating-point overflow (hex 0C06) exception and floating-point underflow (hex 0C07) exception are signaled, respectively.
06 Addressing
08 Argument/Parameter
0C Computation
10 Damage Encountered
1C Machine-Dependent
20 Machine Support
22 Object Access
24 Pointer Specification
2C Program Execution
2E Resource Control Limit
36 Space Management
44 Protection Violation