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6
Optimizing Performance
The MATLAB Compiler can perform various optimizations on your M-file source code that can make
the performance of the generated C/C++ code much faster than the performance of the M-code in the
MATLAB interpreter.
MATLAB Compiler 3.0 provides a series of optimizations that can help speed up your compiled code.
This chapter describes the optimization options.
The only times you would choose not to optimize are if you are debugging your code or you want to
maintain the readability of your code.
Optimization Bundles (p. 6-2) Bundles that allow you to select the most common
optimization options
Optimizing Arrays (p. 6-4) Improving the performance of code that manipulates
scalar arrays
Optimizing Loops (p. 6-6) Improviing the performance of simple one- and
two-dimensional array index expressions
Optimizing Conditionals (p. 6-9) Reducing the MATLAB conditional operators to scalar C
conditional operators
Optimizing MATLAB Arrays (p. 6-10) Accelerates scalar math operations
- MATLAB Compiler 1
- How to Contact The MathWorks: 2
- Working with MEX-Files 5
- Stand-Alone Applications 5
- Controlling Code Generation 7
- Error and Warning Messages 9
- Contents 10
- Preface 12
- Using this Guide 13
- Introducing the 15
- Introduction 16
- New Features 18
- Optimizations 19
- Additional Data Type Support 20
- Additional Language Support 21
- Running Compiler from MATLAB 21
- Uses of the Compiler 23
- (libmatlbmx) 24
- C Stand-Alone Applications 25
- C++ Stand-Alone Applications 25
- The MATLAB Compiler Family 28
- Why Compile M-Files? 30
- Changed Library Name 31
- Changed Data Type Names 31
- Limitations and Restrictions 32
- functionscalled 33
- Workaround 34
- Installation and 37
- Configuration 37
- UNIX Workstation 40
- Compiler Options Files 41
- Locating Options Files 42
- ANSI C or C++ Compiler 43
- Things to Be Aware of 43
- Choosing a Compiler 43
- Changing Compilers 44
- Creating MEX-Files 45
- Verifying from MATLAB 47
- Microsoft Windows on PCs 49
- How the Function Works 66
- 3 Working with MEX-Files 68
- Using the -S Option 71
- Using the -u and -y Options 72
- Sample Time 72
- Data Type 73
- Stand-Alone 77
- Applications 77
- MEX-Files 78
- Stand-Alone C++ Applications 79
- Introducing mbuild 82
- Configuring for C or C++ 83
- Using the System Compiler 84
- Locating Shared Libraries 87
- Running Your Application 88
- Distribution Caveats 89
- Compiler Restrictions 92
- Shared Libraries 98
- Verifying the MATLAB Compiler 99
- About the mbuild Script 99
- 4 Stand-Alone Applications 100
- Installing Your Application 103
- On UNIX Systems 104
- Building COM Objects 107
- Troubleshooting 109
- Troubleshooting the Compiler 111
- Coding with M-Files Only 113
- Functions 117
- The Build Process 119
- Mixing M-Files and C or C++ 121
- An Explanation of mrankp.c 122
- Advanced C Example 123
- An Explanation of This C Code 125
- Controlling 127
- Code Generation 127
- Sierpinski Gasket M-File 128
- Generated Code 129
- 5 Controlling Code Generation 130
- C++ Header File 135
- Internal Interface Functions 137
- F Interface Function 143
- NF Interface Function 144
- VF Interface Function 146
- Supported Executable Types 147
- POSIX Main Wrapper 148
- C Shared Library 151
- COM Components 155
- COM Signature 158
- Setting Page Width 161
- Setting Indentation Spacing 163
- Modified Indentation 165
- Comments Annotation 167
- All Annotation 167
- No Annotation 168
- Include #line Directives 169
- Using feval 174
- Compiling MEX-Files 175
- Optimizing Performance 177
- Turn On All Optimizations 178
- Turn Off All Optimizations 178
- List All Optimizations 179
- 6 Optimizing Performance 180
- Optimizing Arrays 181
- Optimizing Loops 183
- Optimizing Conditionals 185
- Reference 187
- 7 Reference 188
- Functions — By Name 7 190
- 7%#external 191
- Syntax %#external 191
- 7%#function 192
- Purpose feval pragma 192
- Purpose mex pragma 193
- Syntax %#mex 193
- Syntax mbchar(x) 194
- Description The statement 194
- Syntax mbcharscalar(x) 195
- Syntax mbcharvector(x) 196
- Syntax mbint(n) 197
- , mbintvector, mcc 198
- Syntax mbintscalar(n) 199
- See Also mbint, mbscalar, mcc 199
- Syntax mbintvector(n) 200
- Syntax mbreal(n) 201
- Syntax mbrealscalar(n) 202
- Syntax mbrealvector(n) 203
- Syntax mbscalar(n) 204
- Syntax mbvector(n) 205
- Command Line Syntax 211
- Setting Up Default Options 213
- Handling Full Pathnames 215
- Compiling Embedded M-Files 216
- Macro Options 217
- Bundle Files 219
- Code Generation Options 221
- Quick Reference 237
- Common Uses of the Compiler 238
- Error and Warning 245
- Messages 245
- B Error and Warning Messages 246
- Compile-Time Errors 247
- Warning Messages 255
- Run-Time Errors 263
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