axpy

Computes a vector-scalar product and adds the result to a vector.

Syntax

void axpy(queue &exec_queue, std::int64_t n, T alpha, buffer<T, 1> &x, std::int64_t incx, buffer<T, 1> &y, std::int64_t incy)

axpy supports the following precisions and devices.

T

Devices Supported

float

Host, CPU, and GPU

double

Host, CPU, and GPU

std::complex<float>

Host, CPU, and GPU

std::complex<double>

Host, CPU, and GPU

Description

The axpy routines compute a scalar-vector product and add the result to a vector:

y <- alpha*x+y

where:

x and y are vectors of n elements,

alpha is a scalar.

Input Parameters

exec_queue

The queue where the routine should be executed.

n

Number of elements in vector x.

alpha

Specifies the scalar alpha.

x

Buffer holding input vector x. The buffer must be of size at least (1 + (n 1)*abs(incx)). See Matrix and Vector Storage for more details.

incx

Stride of vector x.

y

Buffer holding input vector y. The buffer must be of size at least (1 + (n 1)*abs(incy)). See Matrix and Vector Storage for more details.

incy

Stride of vector y.

Output Parameters

y

Buffer holding the updated vector y.

Example

An example of how to use axpycan be found in the Intel® oneMKL installation directory, under:

examples/sycl/blas/axpy.cpp