Conditions for Code Replacement of Math Operators with QHL

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 for floating-point data type input only when you set specific properties, as indicated in this table.

Operators	Float Input Requirements	Float Parameter Requirements	Equivalent Functions
Addition (+)	Input can be vector or matrix Real or Complex Values	Real Input Length > 1000 OR Complex Input Length >= 500	Vector and matrix real inputs qhblas_vector_add_af Vector and matrix complex inputs mw_qhblas_vector_add_acf
Subtraction (-)	Input can be vector or matrix Real or Complex Values	Real Input Length > 1000 OR Complex Input Length >= 500	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 or Complex Values	Real Input Length > 1000 OR Complex Input Length >= 500	Vector and matrix real inputs qhblas_vector_hadamard_af Vector and matrix complex inputs mw_qhblas_vector_hadamard_acf
Multiplication - scaling	Input can be vector or matrix Real or Complex Values	Real Input Length > 1000 OR Complex Input Length >= 500	Vector and matrix real inputs qhblas_vector_add_af Vector and matrix complex inputs mw_qhblas_vector_add_acf
Matrix inverse	Real or Complex Values square input Dim = 2, 3 and 4	-	Matrix real inputs mw_qhblas_matrix_inverse_af Matrix complex inputs mw_qhblas_matrix_inverse_acf
Comparators	Input can be a vector or matrix Real or Complex values Equal (==) Not Equal (~=) Input can be a vector or matrix Real values Greater than (>) Greater than or equal (>=) Less than (<) Less than or equal (<=)	Equal (==) Real Input Length >= 20 OR Complex Input Length > inf Not Equal (~=) Real Input Length > = 16 OR Complex Input Length > inf Greater than (>) Greater than or equal (>=) Real Input Length > 16 Less than (<) Less than or equal (<=) Real Input Length > 16	Equal (==) - Real - mw_q6_cmp_eq_af Complex - mw_q6_cmp_eq_acf Not Equal (~=) - Real -mw_q6_cmp_neq_af Complex - mw_q6_cmp_neq_acf Greater than (>) - mw_q6_cmp_gt_af Greater than or equal (>=) - mw_q6_cmp_ge_af Less than (<) - mw_q6_cmp_lt_af Less than or equal (<=) - mw_q6_cmp_le_af
Dot Product	Input can be a vector or matrix Real values	Real Input Length > =100	For vector, and matrix real inputs - qhblas_f_vector_dot_af For vector, and matrix complex inputs - qhblas_cf_vector_dot_acf

The library supports these math operators for fixed-point Q15 data types only when you set specific properties, as indicated in this table.

Operators	Fixed-point Q15 Input Requirements	Input DataType	Fixed-point Q15 Parameter Requirements	Equivalent Functions
Addition (+)	Input can be vector or matrix Real or Complex Values	fixdt(1,16,*)	Real Input Length ≥ 16 OR Complex Input Length ≥ 8 Word length must be 16 bits with adjustable fractional length (0–15 bits)	Vector and matrix real inputs mw_qhblas_vector_add_ah Vector and matrix complex inputs mw_qhblas_vector_add_ach
Subtraction (-)	Input can be vector or matrix Real or Complex Values	fixdt(1,16,*)	Real Input Length ≥ 16 OR Complex Input Length ≥ 8 Word length must be 16 bits with adjustable fractional length (0–15 bits)	Vector and matrix real inputs mw_qhblas_vector_sub_ah Vector and matrix complex inputs mw_qhblas_vector_sub_ach
Element-wise matrix multiplication	Input can be vector or matrix Real Value	fixdt(1,16,*)	Real Input Length ≥ 8 Word length must be 16 bits with adjustable fractional length (0–15 bits)	Vector and matrix real inputs mw_qhblas_vector_hadamard_ah
Multiplication - Scaling	Input can be vector or matrix Real or Complex Values	fixdt(1,16,*)	Real Input Length ≥ 8 OR Complex Input Length ≥ 1	Vector and matrix real inputs mw_qhblas_vector_scaling_ah Vector and matrix complex inputs mw_qhblas_vector_add_ach

The library supports these integer operations for fixed-point Q15 data types only when you set specific properties, as indicated in this table.

Operators	Fixed-point Q15 Input Requirements	Input DataType	Fixed-point Q15 Parameter Requirements	Equivalent Functions
Shift	Shift value via input port. Input can be a vector or matrix (int32 or uint32) Real value Shift left (<<) Shift right arithmetic (>>) Shift value via dialog. Input can be a vector or matrix (int32 or uint32) Real value Shift left (<<) Shift right arithmetic (>>) Shift right logical (.>>)	int32 uint32	Real Input Length > 26	Shift left (<<) - mw_q6_asl_aw/mw_q6_lsl_aw Shift right arithmetic (>>) - mw_q6_asr_aw Shift right logical (.>>) - mw_q6_lsr_aw