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
`abs`¹	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`).