dot

Intel® oneAPI Math Kernel Library (oneMKL) - Data Parallel C++ Developer Reference

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ID 772045

Date 12/16/2022

Version

Public

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dot

Computes the dot product of two real vectors.

Description

The dot routines perform a dot product between two vectors. The operation is defined as:

dot supports the following precisions:

T	Tres
`sycl::half`	`sycl::half`
`oneapi::mkl::bfloat16`	`oneapi::mkl::bfloat16`
`float`	`float`
`double`	`double`
`float`	`double`

NOTE:

For mixed precision version (inputs are float while result is double), dot product is computed with double precision.

dot (Buffer Version)

Syntax

namespace oneapi::mkl::blas::column_major {
    void dot(sycl::queue &queue,
             std::int64_t n,
             sycl::buffer<T,1> &x,
             std::int64_t incx,
             sycl::buffer<T,1> &y,
             std::int64_t incy,
             sycl::buffer<Tres,1> &result)
}

namespace oneapi::mkl::blas::row_major {
    void dot(sycl::queue &queue,
             std::int64_t n,
             sycl::buffer<T,1> &x,
             std::int64_t incx,
             sycl::buffer<T,1> &y,
             std::int64_t incy,
             sycl::buffer<Tres,1> &result)
}

Input Parameters

queue: The queue where the routine should be executed.
n: Number of elements in vectors x and y.
x: Buffer holding input vector x. Size of the buffer must be at least (1 + (n – 1)*abs(incx)). See Matrix Storage for more details.
incx: Stride of vector x.
y: Buffer holding input vector y. Size of the buffer must be at least (1 + (n – 1)*abs(incy)). See Matrix Storage for more details.
incy: Stride of vector y.

Output Parameters

result: Buffer where the result (a scalar) will be stored.

dot (USM Version)

Syntax

namespace oneapi::mkl::blas::column_major {
    sycl::event dot(sycl::queue &queue,
                    std::int64_t n,
                    const T *x,
                    std::int64_t incx,
                    const T *y,
                    std::int64_t incy,
                    Tres *result,
                    const std::vector<sycl::event> &dependencies = {})
}

namespace oneapi::mkl::blas::row_major {
    sycl::event dot(sycl::queue &queue,
                    std::int64_t n,
                    const T *x,
                    std::int64_t incx,
                    const T *y,
                    std::int64_t incy,
                    Tres *result,
                    const std::vector<sycl::event> &dependencies = {})
}

Input Parameters

queue: The queue where the routine should be executed.
n: Number of elements in vectors x and y.
x: Pointer to input vector x. Size of the array holding vector x must be least (1 + (n – 1)*abs(incx)). See Matrix Storage for more details.
incx: Stride of vector x.
y: Pointer to input vector y. Size of the array holding vector y must be at least (1 + (n – 1)*abs(incy)). See Matrix Storage for more details.
incy: Stride of vector y.
dependencies: List of events to wait for before starting computation, if any. If omitted, defaults to no dependencies.

Output Parameters

result: Pointer to where the result (a scalar) will be stored.

Return Values

Output event to wait on to ensure computation is complete.

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Intel® oneAPI Math Kernel Library (oneMKL) - Data Parallel C++ Developer Reference

dot

Description

dot (Buffer Version)

dot (USM Version)