C Datatypes Specific to Intel MKL

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 11/07/2023

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C Datatypes Specific to Intel MKL

The mkl_types.hfile defines datatypes specific to Intel® oneAPI Math Kernel Library (oneMKL).

C/C++ Type	Fortran Type	LP32 Equivalent (Size in Bytes)	LP64 Equivalent (Size in Bytes)	ILP64 Equivalent (Size in Bytes)
`MKL_INT` (MKL `integer`)	`INTEGER` (default `INTEGER`)	C/C++: `int` Fortran: `INTEGER*4` (4 bytes)	C/C++: `int` Fortran: `INTEGER*4` (4 bytes)	C/C++: `long long` (or define `MKL_ILP64` macros Fortran: `INTEGER*8` (8 bytes)
`MKL_UINT` (MKL `unsigned integer`)	N/A	C/C++: `unsigned int` (4 bytes)	C/C++: `unsigned int` (4 bytes)	C/C++: `unsigned long long` (8 bytes)
`MKL_LONG` (MKL `long integer`)	N/A	C/C++: `long` (4 bytes)	C/C++: `long` (Windows: 4 bytes) (Linux, Mac: 8 bytes)	C/C++: `long` (8 bytes)
`MKL_Complex8` (Like C99 `complex float`)	`COMPLEX*8`	(8 bytes)	(8 bytes)	(8 bytes)
`MKL_Complex16` (Like C99 `complex double`)	`COMPLEX*16`	(16 bytes)	(16 bytes)	(16 bytes)

You can redefine datatypes specific to Intel® oneAPI Math Kernel Library (oneMKL). One reason to do this is if you have your own types which are binary-compatible with Intel® oneAPI Math Kernel Library (oneMKL) datatypes, with the same representation or memory layout. To redefine a datatype, use one of these methods:

Insert the #define statement redefining the datatype before the mkl.h header file #include statement. For example,
```
#define MKL_INT size_t
#include "mkl.h"
```
Use the compiler -D option to redefine the datatype. For example,
```
...-DMKL_INT=size_t...
```

NOTE:

As the user, if you redefine Intel® oneAPI Math Kernel Library (oneMKL) datatypes you are responsible for making sure that your definition is compatible with that of Intel® oneAPI Math Kernel Library (oneMKL). If not, it might cause unpredictable results or crash the application.

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Developer Reference for Intel® oneAPI Math Kernel Library for C

C Datatypes Specific to Intel MKL