Expression value calculations

The rules are applied when calculating the values.

The following rules apply when calculating a value:

• If it is participating in an arithmetic operation, the value of an absolute term is its constant value, and the value of a relocatable term (E_EXT, E_REL, or E_TREL) is its relocatable address.
• If the resultant expression is used as a displacement in a D-form instruction, the assembler implicitly subtracts the containing csect address from the final result for expressions of type E_EXT or E_REL, or subtracts the TOC anchor address for expressions of type E_TREL. There is no implicit subtracting for expressions with E_ABS or E_REXT type.