Remove internal data zero initialization
Control generation of Initialization code for internal work structures, such as block states and block outputs, to zero
Model Configuration Pane: Code Generation / Optimization
Description
The Remove internal data zero initialization parameter specifies whether to generate initialization code for internal work structures, such as block states and block outputs, to zero.
Settings
on
| off
- On
Does not generate code that initializes internal work structures to zero.
During startup, standards-compliant C and C++ compilers initialize global data to zero, eliminating the need to include zero initialization code for this data in the generated code. Standards-compliant compilers do not necessarily initialize dynamically allocated data and local variables to zero. Before leaving the Remove internal data zero initialization parameter selected, confirm that your model meets these conditions:
If your compiler is not standards-compliant, confirm that it initializes global data to zero.
If you set the Code Interface packaging to
Reusable function
orC++ class
, confirm that data is either statically allocated or that dynamically allocated data is initialized to zero.
Generated code initializes data that you specify in an Initialize Function block, even if you select this parameter.
- Off
Generates code that initializes internal work structures to zero.
Generated code does not initialize data whose storage class has imported scope, unless you specify that data in an Initialize Function block.
If you set the Code interface packaging parameter to Nonreusable function
, by default, the Remove internal data zero initialization check box is selected and ZeroInternalMemoryAtStartup
is set to 'off'
.
If you set the Code interface packaging parameter to Reusable function
or C++ Class
, by default, the Remove internal data zero initialization check box is cleared and ZeroInternalMemoryAtStartup
is set to 'on'
.
The parameter check box is cleared ( ZeroInternalMemoryAtStartup
is 'on'
and read-only) for a model in which the Code interface packaging parameter is set to C++ class
and the Use dynamic memory allocation for model initialization parameter is selected. If you set the Code interface packaging parameter to Reusable function
and select the Use dynamic memory allocation for model block instantiation parameter, the parameter check box is cleared ( ZeroInternalMemoryAtStartup
is set to 'on'
).
Recommended Settings
Application | Setting |
---|---|
Debugging | No impact |
Traceability | No impact |
Efficiency | On (GUI), off (command line), (execution, ROM), No impact (RAM) |
Safety precaution | No recommendation |
Programmatic Use
Parameter: ZeroInternalMemoryAtStartup |
Type: character vector |
Value:
'off' (UI Setting On) | 'on' (UI Setting
Off) |
Default:
'off' |
Version History
Introduced in R2007a