Texas Instruments TI-89 Software Guide

286
Section 3: Assembler
TI
-
89 / TI
-
92 Plus Sierra C Assembler Reference Manual
Not for Distribution
Beta Version February 2, 2001
extent
Specifies the
extent
of the forward branches that are generated to
span the
THEN
and
ELSE
statement groups. The legal values are
shown below; if omitted, the branch extent is determined by the
current default forward branch size (see
OPT BRB/BRS/BRW
directive).
B
8-bit forward branch.
S
8-bit forward branch.
W
16-bit forward branch.
statement
Specifies an assembler statement.
The
IF . . . ELSE . . . ENDI
macro is analogous to the
if-else
construct in C. If the
specified expression is true, the set of statements following the
THEN
keyword is
executed; otherwise, the set of statements following the
ELSE
keyword (if
present) is executed.
Code is generated to evaluate the structured control expression
expression
and
to perform the necessary flow of control. This will include either one or two
branches, depending on the expression’s complexity.
When
IF
macros are nested, each
ELSE
clause is associated with the
immediately preceding
IF
macro that is not matched by an
ENDI
or
ELSE
directive.
Example
IF.W D1 <GT> D2 THEN.S
MOVE.W D1,D0
ELSE.S
MOVE.W D2,D0
ENDI

Texas Instruments TI-89 Specifications

General

Display size (HxV)	100 x 160 mm
Memory type	639K FLASH ROM, 188K bytes RAM
Compatible operating systems	Operating System 2.09
Battery type	AAA