Check usage of bit operation blocks

mathworks.hism.hisl_0019

Since R2022a

Dependencies: Simulink^® Check™

Usage: High-Integrity System Modeling

Guideline: hisl_0019: Usage of bitwise operations

Description

Use this check to identify the use of the bitwise operations for input and output data types.

The check also verifies usage of these bit operation blocks:

• Bit Clear

• Bit Set

• Shift Arithmetic

• Bitwise Operator

• Extract Bits

Check Parameters

Use the Model Advisor Configuration Editor to define the scope of the analysis by specifying the input parameters.

Parameter	Description
Check external .m files referenced in the model	Specify whether to run on referenced MATLAB® files in the model. on (default) | off
Follow links	Specify whether to include content of library-linked blocks in the analysis. on (default) | off
Look under masks	Specify whether to include masked model elements in the analysis. all (default) | none | graphical | functional all — Check analysis includes all masked model elements. none — Check analysis excludes masked model elements. graphical — Check analysis includes only the graphical masked model elements. functional — Check analysis includes only the functional masked model elements.

Recommended Actions and Results

Review the violations that are flagged by the check and the recommended action for fixing the issue. After applying the changes, save the model and rerun the check analysis.

Modeling Condition	Recommended Action
Bitwise operations are used with signed data types.	Use unsigned data type for bitwise operations.

Capabilities and Limitations

• Allows exclusions of blocks and charts

• Analyzes only active variant choices

• Performs model compilation

Version History

Introduced in R2022a