HLASM Language Reference

DC Instruction—Binary Floating-Point Special Values
Floating-Point Special Values
For special values, the syntax of the DC statement is:
►►──DC──┬────────────┬──┬─E─┬──┬─B─┬──┬──────────────┬──────────────►
| └─dup_factor─ ┘ ├ ─D─ ┤ └ ─H─ ┘ └─program_type─┘
└─L─┘
►──┬─────────────────┬──┤ nominal_value ├──────────────────────────►◄
└─length_modifier─┘
nominal_value (type extension B):
┌─ + ─┐
├──'──┼─────┼──┬─(SNAN)─┬──'────────────────────────────────────────┤
└─ - ─┘
├─(QNAN)─┤
├─(NAN)──┤
├─(INF)──┤
├─(MAX)──┤
├─(MIN)──┤
└─(DMIN)─┘
nominal_value (type extension H):
┌─ + ─┐
├──'──┼─────┼──┬─(MAX)──┬──'────────────────────────────────────────┤
└─ - ─┘
├─(MIN)──┤
└─(DMIN)─┘
dup_factor
causes the constant to be generated the number of times indicated by the
factor.
type
indicates that the constant is either short, long or extended floating point.
type extension
the type of conversion required to assemble the constant.
| program_type
| assign a programmer determined 32-bit value to the symbol naming the DC
| instruction, if a symbol was present.
length_modifier
describes the length in bytes or bits into which the constant is to be assembled.
For NANs and INF the minimum length in bits of the constant is:
11 Short floating-point constant
14 Long floating-point constant
18 Extended floating-point constant
This minimum length allows for the sign, exponent and two fraction bits.
170 HLASM V1R5 Language Reference