HLASM Language Reference

LTORG Instruction
The fifth segment contains all the remaining literal constants whose assembled
lengths are odd.
| Since each literal pool is aligned on a SECTALGN alignment, this guarantees that
| all literals in the second segment are doubleword aligned; in the third segment,
| fullword aligned; and, in the fourth, halfword aligned. The minimum value of
| SECALGN is doubleword, so quadword alignment is not guaranteed. No space is
wasted except, possibly, at the origin of the pool, and in aligning to the start of the
statement following the literal pool.
Literals from the following statements are in the pool, in the segments indicated by
the parenthesized numbers:
FIRST START
.
MVC TO,=3F'9' (3)
AD 2,=D'7' (2)
IC 2,=XL1'8' (5)
MVC MTH,=CL3'JAN' (5)
LM 4,5,=2F'1,2' (2)
AH 5,=H'33' (4)
L 2,=A(ADDR) (3)
MVC FIVES,=XL16'5' (1)
Addressing Considerations
If you specify literals in source modules with multiple control sections, you should:
Write a LTORG instruction at the end of each control section, so that all the
literals specified in the section are assembled into the one literal pool for that
section. If a control section is divided and interspersed among other control
sections, you should write a LTORG instruction at the end of each segment of
the interspersed control section.
When establishing the addressability of each control section, make sure (a) that
all of the literal pool for that section is also addressable, by including it within a
USING range, and (b) that the literal specifications are within the corresponding
USING domain. The USING range and domain are described in “USING
Instruction” on page 218.
All the literals specified after the last LTORG instruction, or, if no LTORG instruction
is specified, all the literals in a source module are assembled into a literal pool at
the end of the first control section. You must then make this literal pool
addressable, along with the addresses in the first control section. This literal pool
is printed in the program listing after the END instruction.
Duplicate Literals
If you specify duplicate literals within the part of the source module that is
controlled by a LTORG instruction, only one literal constant is assembled into the
pertinent literal pool. This also applies to literals assembled into the literal pool at
the end of the first or only control section of a source module that contains no
LTORG instructions.
Literals are duplicates only if their specifications are identical, not if the object code
assembled happens to be identical.
Chapter 5. Assembler Instruction Statements 195