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Remove internal data zero initialization

Description

Specify whether to generate initialization code for internal work structures, such as block states and block outputs, to zero.

Category: Optimization

Settings

Default: When the Code interface packaging parameter is set to Nonreusable function, the Remove internal data zero initialization check box is selected and at the command line, ZeroInternalMemoryAtStartup is set to 'off' . When the Code interface packaging parameter is set to Reusable function or C++ Class, the Remove internal data zero initialization check box is cleared and ZeroInternalMemoryAtStartup is set to 'on' .

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 the following 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 or C++ class, confirm that data is either statically allocated or that dynamically allocated data is initialized to zero.

Off

Generates code that initializes internal work structures to zero.

The Remove internal data zero initialization check box is cleared and ZeroInternalMemoryAtStartup is set to 'on' and is 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 Remove internal data zero initialization check box is cleared and ZeroInternalMemoryAtStartup is set to 'on'.

Note

Generated code does not initialize data whose storage class has imported scope.

Dependencies

  • This parameter appears only for ERT-based targets.

  • This parameter requires an Embedded Coder® license when generating code.

Command-Line Information

Parameter: ZeroInternalMemoryAtStartup
Value: 'off' | 'on'
Default: 'off'

Note

The command-line values are the reverse of the settings values. Therefore, 'on' in the command line corresponds to the description of “Off” in the settings section. 'off' in the command line corresponds to the description of “On” in the settings section.

Recommended Settings

ApplicationSetting
DebuggingNo impact
TraceabilityNo impact
EfficiencyOn (GUI), off (command line), (execution, ROM), No impact (RAM)
Safety precautionNo recommendation

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