HLASM Language Reference

DC Instruction—Address Constants
DC
DC
DC
A(L'=F'1.23')
A(I'=F'3.45')
A(S'=FS6'7.89)
Notes:
1. No bit-length modifier (see ▌1▐ in Figure 44) is allowed when a relocatable or
complex relocatable expression (see ▌2▐ in Figure 44) is specified. The only
explicit lengths that can be specified with relocatable or complex relocatable
address constants are:
2 through 8 bytes for AD-type constants
2, 3, or 4 bytes for A-type constants
2 bytes for Y-type constants
The linkage editor/binder/loader you use determines which lengths are actually
supported. Please see the appropriate product manual for more information.
For absolute operands, you may specify byte or bit lengths:
byte lengths 1 through 8, or bit lengths .1 through .128, for A-type
constants
byte lengths 1 or 2, or bit lengths .1 through .16, for Y-type constants
2. The value of the location counter reference (*) when specified in an address
constant varies from constant to constant, if any of the following, or a
combination of the following, are specified:
Multiple operands
Multiple nominal values (see ▌3▐ in Figure 44)
A duplication factor (see ▌4▐ in Figure 44)
The location counter is incremented with the length of the previously assembled
constant.
3. When the location counter reference occurs in a literal address constant, the
value of the location counter is the address of the first byte of the instruction.
Note that the behavior of location counter references in A-type address
constants is different from that in S-type address constants (“Address
Constant—S” on page 156).
Figure 44 (Page 1 of 2). A and Y Address Constants
Subfield Value Example Result
1. Duplication factor Allowed A DC 5AL1(−A) ▌4▐ Object code
X'0001020304'
2. Type A and Y
3. Type Extension D permitted for A
type only
| 4. Program type Allowed
5. Modifiers
Implicit length:
(length modifier
not present)
Alignment:
(Length modifier
not present)
A-type: 4 bytes
AD-type: 8 bytes
Y-type: 2 bytes
A-type: fullword
AD-type: doubleword
Y-type: halfword
154 HLASM V1R5 Language Reference