Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 101)

UM013037-1212 Project Menu

Zilog Developer Studio II – Z8 Encore!

User Manual

Limit Optimizations for Easier Debugging

Selecting this checkbox causes the compiler to generate code in which certain optimiza-

tions are turned off. These optimizations can cause confusion when debugging. For exam-

ple, they might rearrange the order of instructions so that they are no longer exactly

correlated with the order of source code statements or remove code or variables that are

not used. You can still use the debugger to debug your code without selecting this check-

box, but it might difficult because of the changes that these optimizations make in the

assembly code generated by the compiler.

Selecting the

Limit Optimizations for Easier Debugging checkbox makes it more

straightforward to debug your code and interpret what you see in the various Debug win-

dows. However, selecting this checkbox also causes a moderate increase in code size.

Many users select this checkbox until they are ready to go to production code and then

deselect it.

Selecting this checkbox can also increase the data size required by your application. This

happens because this option turns off the use of register variables (see the U

se Register

Var iab les section on page 83). The variables that are no longer stored in registers must

instead be stored in memory (and on the stack if dynamic frames are in use), thereby

increasing the overall data storage requirements of your application. Usually this increase

is fairly small.

You can debug your application when this checkbox is deselected. The debugger contin-

ues to function normally, but debugging might be more confusing due to the factors

described earlier.

This checkbox interacts with the Generate Debug Information checkbox (see the Gener-

ate Debug Information section on page 70).

Memory Model

The

Memory Model drop-down list box allows you to choose between the two memory

models,

Small or Large. Select Small for a small memory model or select Large for a

large memory model. Using the small model results in more compact code and might

reduce the RAM requirements as well. However, the small model places constraints on the

data space size (not on the code space size) of your application. Some applications might

not be able to fit into the small model’s data space size; the large model is provided to sup-

port such applications. See the Memory Models

section on page 199 for full details of the

memory models.

Frames

Select

Static for static frames or select Dynamic for dynamic frames. The use of static

frames generally helps reduce code size, but this option can only be used if your code

obeys certain restrictions. Specifically, recursive function calls (either direct or indirect)

Note:

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