iX Computer Systems - Edition 1 (32715-90001)

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the conversion only once. If the Program Analyst finds a control

variable that is a floating-point type, or a default REAL or DECIMAL type

and the Program Analyst can determine that the starting value, limit,

and step (if present) are all integers, the line number of the FOR loop

is reported. A FOR loop that meets those criteria is very inefficient

because the control variable has to be converted. In addition, the FOR

loop can produce incorrect results.

After the information about the MAIN subunit is display, the cursor is at

the beginning of the Line Range field at the top of the screen. To move

to a different part of the program, enter a line range or a single line

number, or press a softkey to move to the previous or next subunit. If

you select a single line, the line itself is listed at the bottom of the

screen. The data type of each numeric variable is displayed.

The Program Analyst cannot accurately detect conversions that occur

during a call to an external routine, an intrinsic, a subprogram, or a

function. Conversions may be generated if an actual parameter does not

match the declared parameter. Also, any conversions that take place to

determine which CASE to execute in a SELECT structure are not reported.

If your program uses GLOBAL OPTION DECIMAL and does not have OPTION

DECIMAL or OPTION REAL statements in each of the subunits, issue the

VERIFY command before entering the Program Analyst . This notifies all

the subunits that they will be executing in DECIMAL mode and ensures that

you get the most accurate information about conversions.

The Suggest COPTIONs Screen. The purpose of this screen is to predict

the benefit of each of the compiler options (COPTIONs) in terms of

generated code savings.

The Suggest COPTIONs screen estimates the number of words of compiled

code that would be eliminated through the use of each compiler option.

The information is displayed in four columns. The first column contains

the names of all the compiler options. If the subunit or program

currently being displayed has a compiler option in effect, the code

savings is displayed in the Current column. If the program or subunit is

not current taking advantage of that option, the potential savings is

displayed in the Potential column. The final column indicates whether

any features that would prevent the use of an option are being used. The

Program Analyst cannot estimate the actual size of a compiled subunit.

When you enter the Suggest COPTIONs screen, the cursor is positioned

under the first letter in the subunit or program name. You can type a

subunit name or line number or press a softkey to move to another subunit

or line.

The Replace GOSUBs Screen. The purpose of this screen is to replace

GOSUB statement with the subroutines the reference. This improves

performance in some situations.

If a program has GOSUBs that execute many thousands of times, the