| Op Code (Hex) | Operand 1 | Operand 2 | Operand 3 | |
|---|---|---|---|---|
| 107F | Receiver | Decimal exponent | Decimal significand |
Operand 2: Packed scalar or zoned scalar (1 to 31 digits).
Operand 3: Packed scalar or zoned scalar (1 to 31 digits).
This instruction converts the decimal form of a floating-point value specified by a decimal exponent and a decimal significand to binary floating-point format, and places the result in the receiver operand. The decimal exponent (operand 2) and decimal significand (operand 3) are considered to specify a decimal form of a floating-point number. The value of this number is considered to be as follows:
Value = S * (10**E)
where:
|
The decimal significand must be specified as a decimal value with a single integer digit position and optional fractional digit positions. The decimal significand is a signed decimal value specifying decimal digits which give the floating-point value its precision. The significant digits of the decimal significand are considered to start with the leftmost nonzero decimal digit and continue to the right to the end of the decimal significand value. Significant digits beyond 7 for a short float receiver, and beyond 15 for a long float receiver exceed the precision provided for in the binary floating-point receiver. These excess digits do participate in the conversion to provide for uniqueness of the conversion as well as for proper rounding.
The decimal form floating-point value specified by the decimal exponent and decimal significand operands is converted to a binary floating-point number and rounded to the precision of the result field as follows:
Source values which, in magnitude M, are in the range where (10**31-1) * 10**-31 <= M <= (10**31-1) *10**+31 are converted subject to the normal rounding error defined for the floating-point rounding modes.
Source values which, in magnitude M, are in the range where (10**31-1) * 10**-31 > M > (10**31-1) *10**+31 are converted such that the rounding error incurred on the conversion may exceed that defined above. For round to nearest, this error will not exceed by more than .47 units in the least significant digit position of the result in relation to the error that would be incurred for normal rounding. For the other floating-point rounding modes, this error will not exceed 1.47 units in the least significant digit position of the result.
The converted and rounded value is then assigned to the floating-point receiver.
06 Addressing
08 Argument/Parameter
0C Computation
10 Damage Encountered
1C Machine-Dependent
20 Machine Support
22 Object Access
24 Pointer Specification
2E Resource Control Limit
32 Scalar Specification
36 Space Management
44 Protection Violation