Code You Can Replace from MATLAB Code

Code that the code generator replaces depends on the code replacement library (CRL) that you use. By default, the code generator does not apply a code replacement library. Your choice of libraries is dependent on product licensing and whether you have access to custom libraries.

• Math Functions

• Memory Functions

• Operators

Math Functions

When generating C/C++ code from MATLAB^® code, depending on code replacement libraries available in your development environment, you can configure the code generator to replace instances of the following math functions with application-specific implementations.

Function	Data Type Support	Scalar, Vector, Matrix Support	Real, Complex Support
abs1	Floating point	Scalar Vector Matrix	Real Complex
acos	Floating point	Scalar Vector Matrix	Real Complex Complex input/complex output Real input/complex output
acosd	Floating point	Scalar Vector Matrix	Real Complex
acot	Floating point	Scalar Vector Matrix	Real Complex
acotd	Floating point	Scalar Vector Matrix	Real Complex
acoth	Floating point	Scalar Vector Matrix	Real Complex
acsc	Floating point	Scalar Vector Matrix	Real Complex
acscd	Floating point	Scalar Vector Matrix	Real Complex
acsch	Floating point	Scalar Vector Matrix	Real Complex
asec	Floating point	Scalar Vector Matrix	Real Complex
asecd	Floating point	Scalar Vector Matrix	Real Complex
asech	Floating point	Scalar Vector Matrix	Real Complex
asin	Floating point	Scalar Vector Matrix	Real Complex Complex input/complex output Real input/complex output
asind	Floating point	Scalar Vector Matrix	Real Complex
atan	Floating point	Scalar Vector Matrix	Real Complex Complex input/complex output Real input/complex output
atan2	Floating point	Scalar Vector Matrix	Real
atan2d	Floating point	Scalar Vector Matrix	Real
atand	Floating point	Scalar Vector Matrix	Real Complex
cos	Floating point	Scalar Vector Matrix	Real Complex Complex input/complex output Real input/complex output
ceil	Floating-point Scalar	Floating-point Scalar	Floating-point Scalar
cosd	Floating point	Scalar Vector Matrix	Real Complex
cosh	Floating point	Scalar Vector Matrix	Real Complex Complex input/complex output Real input/complex output
cot	Floating point	Scalar Vector Matrix	Real Complex
cotd	Floating point	Scalar Vector Matrix	Real Complex
coth	Floating point	Scalar Vector Matrix	Real Complex
csc	Floating point	Scalar Vector Matrix	Real Complex
cscd	Floating point	Scalar Vector Matrix	Real Complex
csch	Floating point	Scalar Vector Matrix	Real Complex
exp	Floating point	Scalar Vector Matrix	Real
fix	Floating point	Scalar	Real
floor	Floating-point Scalar	Floating-point Scalar	Floating-point Scalar
hypot	Floating point	Scalar Vector Matrix	Real
ldexp	Floating point	Scalar	Real
log	Floating point	Scalar Vector Matrix	Real Complex
log10	Floating point	Scalar Vector Matrix	Real Complex
log2	Floating point	Scalar Vector Matrix	Real Complex
max	Integer Floating point	Scalar	Real
min	Integer Floating point	Scalar	Real
pow	Floating point	Scalar	Real
rem	Floating point	Scalar	Real
round	Floating point	Scalar	Real
sec	Floating point	Scalar Vector Matrix	Real Complex
secd	Floating point	Scalar Vector Matrix	Real Complex
sech	Floating point	Scalar Vector Matrix	Real Complex
sign	Floating point	Scalar	Real
sin	Floating point	Scalar Vector Matrix	Real Complex Complex input/complex output Real input/complex output
sind	Floating point	Scalar Vector Matrix	Real Complex
sinh	Floating point	Scalar Vector Matrix	Real Complex Complex input/complex output Real input/complex output
sqrt	Floating point	Scalar	Real
tan	Floating point	Scalar Vector Matrix	Real Complex Complex input/complex output Real input/complex output
tand	Floating point	Scalar Vector Matrix	Real Complex
tanh	Floating point	Scalar Vector Matrix	Real Complex Complex input/complex output Real input/complex output
1 Wrap on integer overflow only

Memory Functions

Depending on code replacement libraries available in your development environment, you can configure the code generator to replace instances of the following memory functions with application-specific implementations.

Function	Data Type Support	Scalar, Vector, Matrix Support	Real, Complex Support
memcmp	Void pointer (void*)	Scalar Vector Matrix	Real Complex
memcpy	Void pointer (void*)	Scalar Vector Matrix	Real Complex
memset	Void pointer (void*)	Scalar Vector Matrix	Real Complex
memset2zero	Void pointer (void*)	Scalar Vector Matrix	Real Complex

Some target processors provide optimized functions to set memory to zero. Use the code replacement library programming interface to replace the memset2zero function with more efficient target-specific functions.

Operators

When generating C/C++ code from MATLAB code, depending on code replacement libraries available in your development environment, you can configure the code generator to replace instances of the following operators with application-specific implementations.

Mixed data type support indicates you can specify different data types of different inputs.

Operator	Key	Data Type Support	Scalar, Vector, Matrix Support	Real, Complex Support
Addition (+)1	RTW_OP_ADD	Integer Floating point Fixed-point Mixed	Scalar Vector Matrix	Real Complex
Subtraction (-)1	RTW_OP_MINUS	Integer Floating point Fixed-point Mixed	Scalar Vector Matrix	Real Complex
Multiplication (*)2	RTW_OP_MUL	Integer Floating point Fixed-point Mixed	Scalar Vector Matrix	Real Complex
Division (/)	RTW_OP_DIV	Integer Floating point Fixed-point Mixed	Scalar	Real Complex
Data type conversion (cast)	RTW_OP_CAST	Integer Floating point3 Fixed-point Mixed	Scalar Vector Matrix	Real Complex
Shift left (<<)	RTW_OP_SL	Integer Fixed-point Mixed	Scalar Vector Matrix	Real
Shift right arithmetic (>>)4	RTW_OP_SRA	Integer Fixed-point Mixed	Scalar Vector Matrix	Real
Shift right logical (>>)	RTW_OP_SRL	Integer Fixed-point Mixed	Scalar Vector Matrix	Real
Element-wise matrix multiplication (.*)5	RTW_OP_ELEM_MUL	Integer Floating point Fixed-point Mixed	Vector Matrix	Real Complex
Complex conjugation	RTW_OP_CONJUGATE	Integer Floating point Fixed-point Mixed	Scalar Vector Matrix	Real Complex
Transposition (.')	RTW_OP_TRANS	Integer Floating point Fixed-point Mixed	Vector Matrix	Real Complex
Hermitian (complex conjugate) transposition (')	RTW_OP_HERMITIAN	Integer Floating point Fixed-point Mixed	Vector Matrix	Real Complex
Multiplication with transposition2	RTW_OP_TRMUL	Integer Floating point Fixed-point Mixed	Vector Matrix	Real Complex
Multiplication with Hermitian transposition2	RTW_OP_HMMUL	Integer Floating point Fixed-point Mixed	Vector Matrix	Real Complex
Multiplication followed by shift right arithmetic (u1*u2>>u3)6	RTW_OP_MUL_SRA	Integer Fixed-point	Scalar	Real
Multiplication followed by division (u1*u2/u3)7	RTW_OP_MULDIV	Integer Fixed-point	Scalar	Real
Greater than (>)	RTW_OP_GREATER_ THAN	Integer Floating point Fixed-point Mixed	Scalar Vector Matrix	Real Complex
Greater than or equal (>=)	RTW_OP_GREATER_ THAN_OR_EQUAL	Integer Floating point Fixed-point Mixed	Scalar Vector Matrix	Real Complex
Less than (<)	RTW_OP_LESS_THAN	Integer Floating point Fixed-point Mixed	Scalar Vector Matrix	Real Complex
Less than or equal (<=)	RTW_OP_LESS_THAN_ OR_EQUAL	Integer Floating point Fixed-point Mixed	Scalar Vector Matrix	Real Complex
Equal (==)	RTW_OP_EQUAL	Integer Floating point Fixed-point Mixed	Scalar Vector Matrix	Real Complex
Not equal (!=)	RTW_OP_NOT_EQUAL	Integer Floating point Fixed-point Mixed	Scalar Vector Matrix	Real Complex
1 See Addition and Subtraction Operator Code Replacement for details to consider when defining mappings for addition and subtraction code replacements. 2 Can map to Basic Linear Algebra Subroutine (BLAS) multiplication functions. 3 Scaled floating point is not supported. 4 Code replacement libraries that provide arithmetic shift right implementations should also provide logical shift right implementations, because some arithmetic shift rights are converted to logical shift rights during code generation. 5 Use the multiplication (*) operator (RTW_OP_MUL) for scalar multiplication. 6 Requires scalar, real, or fixed-point data types with zero bias; output type of the multiplication operation to accommodate all possible output values; shift operand is an unsigned integer; and net slope is equal to 1 (U1_slope * U2_slope == Mul_output_slope and Mul_output_slope == output_slope_of_shift_operation). 7 Requires scalar, real, or fixed-point data types with zero bias; output type of the multiplication operation to accommodate all possible output values; and net slope is equal to 1 (U1_slope * U2_slope == Mul_output_slope == U3_slope * Div_output_slope).

Related Topics

• Develop a Code Replacement Library
• Quick Start Library Development
• What Is Code Replacement?