HLASM Language Reference

DC Instruction
With EBCDIC spaces on the right (X'40') for the character (C) constants
With EBCDIC spaces on the right (X'40') for the Unicode character (CU)
constant prior to translation
With double-byte spaces on the right (X'4040') for the graphic (G) constants
Notes:
1. In floating-point constants (E,D,L), the fraction is extended to occupy the extra
space available.
2. Padding is on the left for all constants except the character constant and the
graphic constant.
Truncation
If less space is available than is needed to accommodate the nominal value, the
nominal value is truncated and part of the constant is lost. Truncation of the
nominal value is:
On the left for the binary (B), hexadecimal (X), fixed-point (H and F), and
decimal (P and Z)
On the right for the character (C) constant, the Unicode character (CU)
constant, and the graphic (G) constant
On the left for absolute or relocatable address (A and Y), the external address
(V), offset (Q), length (J) and PSECT address (R) constants. The actual value
stored and any possible truncation is dependent on the values inserted by the
linker/binder and the length of the constant.
Notes:
1. If significant bits are lost in the truncation of fixed-point constants, error
diagnostic message ASMA72E Data item too large is issued.
2. Floating-point constants (E, D, L) are not truncated. They are rounded to fit the
space available—see Figure 50 on page 162 for rounding modes.
3. The above rules for padding and truncation also apply when using the
bit-length modifier (see “Subfield 5: Modifier” on page 136).
4. Double-byte data in C-type constants cannot be truncated because truncation
creates incorrect double-byte data. Error ASMA28E Truncation into
double-byte data is not permitted is issued if such truncation is attempted.
5. Truncation of double-byte data in CU-type and G-type constants is permitted
because the length modifier restrictions (see “Subfield 5: Modifier” on
page 136) ensure that incorrect double-byte data cannot be created by
| truncation. However, truncating bit-length constants may create incorrect
| double-byte data.
Subfield 1: Duplication Factor
The syntax for coding the duplication factor is shown in the subfield format on page
127.
You may omit the duplication factor. If specified, it causes the nominal value or
multiple nominal values specified in a constant to be generated the number of times
indicated by the factor. It is applied after the nominal value or values are
132 HLASM V1R5 Language Reference