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6 Optimizing Performance
6-6
Optimizing Loops
Simple Indexing
(array_indexing) This optimization improves the performance of simple one-
and two-dimensional array index expressions. Without this optimization, all
array indexing uses the fully general array indexing function, which is not
optimized for one- and two-dimensional indexing. With this optimization
enabled, indexing uses faster routines that are optimized for simple indexing.
For example:
function y = test(x,i1,i2);
y = x(i1,i2);
If you compile this with the -O none option, you get
...
mlfAssign(
&y,
mlfIndexRef(mclVa(x, "x"), "(?,?)", mclVa(i1, "i1"),
mclVa(i2, "i2")));
...
Compiling with -O none -O array_indexing:on gives
...
mlfAssign(
&y, mclArrayRef2(mclVa(x, "x"), mclVa(i1, "i1"),
mclVa(i2,"i2")));
...
The mclArrayRef2 function is optimized for two-dimensional indexing.
mclArrayRef1 is used for one-dimensional indexing.
Loop Simplification
(optimize_integer_for_loops) This optimization detects when a loop starts
and increments with integers. It replaces the loop with a much simpler loop
that uses C integer variables instead of array-valued variables. The
performance improvements with this optimization can be dramatic.
- 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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