HLASM Language Reference

DC Instruction—Hexadecimal Floating-Point Constants
▌3▐ in Figure 51). If a sign is not specified for either the number or exponent, a
plus sign is assumed. If you specify the 'H' type extension you can also specify a
rounding mode that is used when the nominal value is converted from decimal to its
hexadecimal form. The syntax for nominal values (including the binary
floating-point constants) is shown in Figure 53 on page 168. The valid rounding
mode values are:
1 Round by adding one in the first lost bit position
4 Unbiased round to nearest, with tie-breaking rule
5 Round towards zero (that is, truncate)
6 Round up towards the maximum positive value
7 Round down towards the minimum negative value
Figure 50. Rounding Mode Values
See ▌4▐ in Figure 51.
The exponent must lie within the permissible range. If an exponent modifier is also
specified, the algebraic sum of the exponent and the exponent modifier must lie
within the permissible range.
Figure 51 (Page 1 of 3). Hexadecimal Floating-Point Constants
Subfield Value Example
1. Duplication factor Allowed
2. Type E, D, and L
| 3. Type Extension
Omitted or H or Q
| 4. Program type
Allowed
5. Modifiers
Implicit length:
(length modifier
not present)
E-type: 4 bytes
D-type: 8 bytes
L-type: 16 bytes
Alignment:
E-type: Fullword
(Length modifier
D-type: Doubleword
not present)
L-type: Doubleword
| LQ-type: Quadword
162 HLASM V1R5 Language Reference