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oneMKL Defined Datatypes

oneMKL BLAS and LAPACK for Data Parallel C++ (DPC++) introduces several new enumeration data types, which are type-safe versions of the traditional Fortran characters in BLAS and LAPACK. They are declared in types.hpp, which is included automatically when you include mkl.hpp. Like all oneMKL DPC++ functionality, they belong to the namespace oneapi::mkl.

Each enumeration value comes with two names: A single-character name (the traditional BLAS/LAPACK character) and a longer, descriptive name. The two names are exactly equivalent and may be used interchangeably.

transpose

The transpose type specifies whether an input matrix should be transposed and/or conjugated. It can take the following values:

Short Name

Long Name

Description

transpose::N

transpose::nontrans

Do not transpose or conjugate the matrix.

transpose::T

transpose::trans

Transpose the matrix.

transpose::C

transpose::conjtrans

Perform Hermitian transpose (transpose and conjugate). Only applicable to complex matrices.

uplo

The uplo type specifies whether the lower or upper triangle of a riangular, symmetric, or Hermitian matrix should be accessed.

It can take the following values:

Short Name

Long Name

Description

uplo::U

uplo::upper

Access the upper triangle of the matrix.

uplo::L

uplo::lower

Access the lower triangle of the matrix.

In both cases, elements that are not in the selected triangle are not accessed or updated.

diag

The diag type specifies the values on the diagonal of a triangular matrix. It can take the following values:

Short Name

Long Name

Description

diag::N

diag::nonunit

The matrix is not unit triangular. The diagonal entries are stored with the matrix data.

diag::U

diag::unit

The matrix is unit triangular (the diagonal entries are all 1s). The diagonal entries in the matrix data are not accessed.

side

The side type specifies the order of matrix multiplication when one matrix has a special form (triangular, symmetric, or Hermitian):

Short Name

Long Name

Description

side::L

side::left

The special form matrix is on the left in the multiplication.

side::R

side::right

The special form matrix is on the right in the multiplication.

offset

The offset type specifies whether the offset to apply to an output matrix is a fix offset, column offset or row offset. It can take the following values

Short Name

Long Name

Description

offset::F

offset::fix

The offset to apply to the output matrix is fix, all the inputs in the C_offset matrix has the same value given by the first element in the co array.

offset::C

offset::column

The offset to apply to the output matrix is a column offset, that is to say all the columns in the C_offset matrix are the same and given by the elements in the co array.

offset::R

offset::row

The offset to apply to the output matrix is a row offset, that is to say all the rows in the C_offset matrix are the same and given by the elements in the co array.

Parent topic: oneMKL Interfaces

Building the Project Dense Linear Algebra