Conditions for Code Replacement of Math Operators with HVX

Each math operators that can be used with the Support Package for Qualcomm Hexagon Processors requires specific conditions to allow code replacement by using the Qualcomm Hexagon Library (QHL). You use this code replacement when generating C/C++ code from a model or from MATLAB^® code.

If you do not meet the specific requirements, then the generated C/C++ code runs on the Qualcomm Hexagon Processors. However, this generated code does not use library support.

The library supports these math operators only when you set specific properties, as indicated in this table.

Operators	Input Requirements	Parameter Requirements	Equivalent Functions
Addition (+)	Input can be vector or matrix Real and Complex Values	Length should be >=1024 and a multiple of 32	Vector and matrix real inputs qhblas_hvx_vector_add_af Vector and matrix complex inputs mw_qhblas_hvx_vector_add_acf
Subtraction (-)	Input can be vector or matrix Real and Complex Values	Length should be >=1024 and a multiple of 32	Vector and matrix real inputs qhblas_vector_sub_af Vector and matrix complex inputs mw_qhblas_vector_sub_acf
Element-wise matrix multiplication	Input can be vector or matrix Real Values	Length should be >=1024 and a multiple of 32	Vector and matrix real inputs qhblas_hvx_vector_hadamard_af
Multiplication - scaling	Input can be real or complex, and vector or matrix Scale factor has to be a real scalar		Vector and matrix real inputs qhblas_hvx_vector_scaling_af Vector and matrix complex inputs mw_qhblas_hvx_vector_scaling_acf
Matrix Multiplication	Real Values Input can be a vector or matrix	Matrix1 dimensions = m*n Matrix2 dimensions = n*k if RowMajor & k = 1 or ColMajor & m = 1 (2*n) - 1 >= 127 & m*k >= 4 else (2*n) - 1>= 15 & m*k >= 64	For Vector and Matrix real inputs mw_qhblas_hvx_matrix_matrix_mpy_af