pTAL Reference Manual (H06.08+)

Equivalenced Variables
HP pTAL Reference Manual—523746-006
11-11
Equivalenced Simple Pointers
type
is any data type except UNSIGNED. The data type determines how much data the
simple pointer can access at a time (byte, word, doubleword, or quadrupleword).
.
.EXT
.SG
.SGX
are indirection symbols (see Table 2-7 on page 2-7).
identifier
is the identifier of a simple pointer to be made equivalent to previous-
identifier.
previous-identifier
is the identifier of a previously-declared variable, direct array element, pointer,
structure, structure pointer, or equivalenced variable.
index
is an INT constant that specifies an element offset from previous-identifier,
which must be a direct variable. The data type of previous-identifier
dictates the element size. The location represented by index must begin on a
word boundary.
+
-
is the word or byte offset, relative to the base of previous-ident, where the
equivalenced variable is placed. For example, if a and b are declared:
INT(32) a[0:9];
INT b = a+6
then b is placed in the first six bits of a.
offset
is an INT constant that specifies an element offset from previous-identifier,
which must be a direct variable. The data type of previous-identifier
dictates the element size. The location represented by index must begin on a
word boundary.
Topics:
•
Using Equivalenced Simple Pointers on page 11-12
•
REFALIGNED Clause for Equivalenced Simple Pointers on page 11-15