Velocità di esecuzione

Migliorare la velocità di esecuzione del codice generato

Il generatore di codice aumenta, ove possibile, la velocità di esecuzione del codice generato sostituendo le variabili globali con variabili locali, eliminando le copie dei dati, utilizzando le funzioni memset e memcpy e riducendo la quantità di memoria utilizzata per memorizzare i dati. È possibile aumentare la velocità di esecuzione del codice generato implementando ottimizzazioni specifiche per il compiler e il processore, specificando il riutilizzo dei buffer e rimuovendo il codice che potrebbe non essere necessario.

Impostazioni modello

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Velocità di esecuzione

Optimize using the specified minimum and maximum values	Optimize using minimum and maximum values for signals and parameters
Simplify array indexing	Replace multiply operations in array indices when accessing arrays in a loop
Loop unrolling threshold	Specify minimum array size width for generating `for` loops
Optimize reductions	Single instruction, multiple data (SIMD) code for reduction operation loops (Da R2022a)
Use memset to initialize floats and doubles to 0.0	Control generation of code that explicitly initializes floating-point data to 0.0
Data type replacement	Method for replacing built-in data type names in generated code (Da R2023a)
Simulation behavior for denormal numbers	Option to emulate hardware handling of denormal numbers
Use floating-point multiplication to handle net slope corrections	Net slope correction computation for floating-point to fixed-point casts
Leverage target hardware instruction set extensions	Instruction sets to generate single instruction, multiple data (SIMD) code (Da R2021b)
Signal storage reuse	Reuse signal memory
Optimize global data access	Optimize global variable usage
Optimize block operation order in generated code	Specify to reorder block operations for improved code execution speed
Loop unrolling threshold	Specify minimum array size width for generating `for` loops
Use memcpy for vector assignment	Optimize code generated for vector assignments
Conditional input branch execution	Option to optimize input paths for Switch and Multiport Switch blocks
Dynamic memory allocation in MATLAB functions	Option to use dynamic memory allocation for MATLAB code
Code replacement libraries	Libraries that define code optimizations for specific target environment
Generate Halide code	Generate Halide code for faster array computation (Da R2023b)

Argomenti

Nozioni di base sull'ottimizzazione della velocità di esecuzione

Design Techniques to Optimize Models for Efficient Code Generation
Apply design tools and techniques to optimize a model for code generation.
Optimize Generated Code Using Code Efficiency Tools and Techniques
When generating production code from your model to deploy into a real-time embedded system, code efficiency is an important consideration.
Configure Model for Code Generation Objectives by Using Code Generation Advisor
Use the Code Generation Advisor to check your model against code generation objectives.
Generate Efficient Code by Setting Model Configuration Parameters
Choose the efficiency level and priorities for your generated code.

Ottimizzazioni specifiche per il processore

Control Data and Function Placement in Memory by Inserting Pragmas
Increase code efficiency on your hardware by inserting pragmas in the generated code. Pragmas specify locations in memory to store data and functions.
Replace boolean with Specific Integer Data Type
Improve the execution speed of the generated code by replacing the boolean built-in data type with a specific integer data type.
Subnormal Number Execution Speed
Minimize the possibility of execution slowdowns or overruns due to subnormal number calculation latency.
Floating-Point Multiplication to Handle a Net Slope Correction
For processors that support efficient multiplication, improve code efficiency by using floating-point multiplication to handle a net slope correction.
Generate Target Optimizations Within Algorithm Code
Customize generated algorithm code with target-specific optimizations.
Generate SIMD Code from Simulink Blocks for Intel Platforms
Improve the execution speed of the generated code using Intel^® SSE and Intel AVX technology.
Generate SIMD Code from Simulink Blocks for Apple silicon Platforms
Improve the execution speed of the generated code for Apple silicon platforms using ARM^® Neon technology.
Optimize SIMD Code by Performing Fused Multiply Add Operations
For processors that support FMA instructions, improve execution efficiency by performing fused multiply-add operations.

Ottimizzazioni che migliorano l'efficienza di esecuzione

Optimize Global Variable Usage
Choose a global variable reference optimization to satisfy your memory usage and execution speed requirements.
Improve Execution Efficiency by Reordering Block Operations in the Generated Code
The code generator can change the block execution order to improve execution efficiency.
Configure Loop Unrolling Threshold
Starting at a default value of 5, the code generator begins to use a for loop instead of separate statements to assign values to the elements of a signal or parameter array.
Use memcpy Function to Optimize Generated Code for Vector Assignments
The code generator optimizes the generated code for vector assignments by replacing for loops with memcpy function calls.
Use Conditional Input Branch Execution
For Switch and Multiport Switch blocks, Simulink^® executes only blocks that compute the control input and the data input that the control input selects.
Control Memory Allocation for Variable-Size Arrays in a MATLAB Function Block
Disable dynamic memory allocation or specify a dynamic memory allocation threshold for MATLAB Function blocks.
Speed Up Linear Algebra in Code Generated from a MATLAB Function Block
Generate LAPACK calls for certain linear algebra functions in a MATLAB function block. Specify LAPACK library to use.
Speed Up Matrix Operations in Code Generated from a MATLAB Function Block
Generate BLAS calls for certain low-level matrix operations. Specify BLAS library to use.
Speed Up Fast Fourier Transforms in Code Generated from a MATLAB Function Block
Generate FFTW library calls for fast Fourier transforms in a MATLAB Function block. Specify the FFTW library.
Synchronize Multithreaded FFTW Planning in Code Generated from a MATLAB Function Block
Implement FFT library callback class methods and provide supporting C code to prevent concurrent access to FFTW planning.
Optimize Performance of Memory Access by Using Data Alignment
Optimize the alignment of data in memory for your hardware.

Ottimizzazioni mediante generazione di codice Halide

Speed Up Generated Code Execution with Halide Code
Generate Halide code from Simulink models for faster array computation.
When to Use Halide Code for Efficiency
Determine when to use Halide code to provide greater execution speed.
Enhance Generated Code Performance Using Halide from a MATLAB Function Block
Generate Halide code from MATLAB Function blocks in a Simulink model for faster array computation.

Informazioni complementari

Profilazione del tempo di esecuzione del codice

Esempi in primo piano

Optimize Generated Code by Developing and Using Code Replacement Libraries - Simulink

Optimize the generated code using code replacement library.

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