The Natural Optimizer Compiler is particularly effective for programs that contain a considerable amount of data manipulation, such as computation, transfer, and logical condition processing.
The Natural Optimizer Compiler compiles the following statements to machine code:
assignment statements (ASSIGN and MOVE)
RESET
arithmetic statements (COMPUTE, ADD,
SUBTRACT, MULTIPLY, DIVIDE)
conditional statements (IF, DECIDE)
control statements (FOR, REPEAT)
ESCAPE
COMPRESS
EXAMINE
with the following clauses only:
GIVING NUMBER, GIVING POSITION or
GIVING LENGTH (see also the Natural
Statements
documentation).
GIVING INDEX is not optimized. Example:
EXAMINE #TEXT FOR #A GIVING NUMBER #NMB1 EXAMINE #TEXT FOR #A GIVING POSITION #POSEX5 EXAMINE #TEXT FOR #A GIVING LENGTH #LGHEX6
The Natural Optimizer Compiler does not compile the following statements:
I/O statements (DISPLAY, WRITE,
READ/WRITE WORK FILE).
complex special statements such as SEPARATE.
statements that pass control to another programming object such as
FETCH, PERFORM, CALLNAT,
CALL.
statements that perform database access (READ,
FIND, HISTOGRAM, GET,
UPDATE, DELETE, END TRANSACTION,
BACKOUT TRANSACTION)
Note:
The options the Natural Optimizer Compiler provides cannot be used
for specifying statements to be optimized as described in the
Optimizer Options.
