Visible to Intel only — GUID: GUID-03F96406-62A7-47C1-8BAC-D47656904497
Visible to Intel only — GUID: GUID-03F96406-62A7-47C1-8BAC-D47656904497
axpby
Computes a vector-scalar product added to a scaled-vector.
Description
The axpby routines compute two scalar-vector products and add them:
where:
x and y are vectors of n elements
alpha and beta are scalars
axpby supports the following precisions:
T |
---|
float |
double |
std::complex<float> |
std::complex<double> |
axpby (Buffer Version)
Syntax
namespace oneapi::mkl::blas::column_major {
void axpby(sycl::queue &queue,
std::int64_t n,
T alpha,
sycl::buffer<T,1> &x,
std::int64_t incx,
T beta,
sycl::buffer<T,1> &y,
std::int64_t incy);
}
namespace oneapi::mkl::blas::row_major {
void axpby(sycl::queue &queue,
std::int64_t n,
T alpha,
sycl::buffer<T,1> &x,
std::int64_t incx,
T beta,
sycl::buffer<T,1> &y,
std::int64_t incy);
}
Input Parameters
- queue
-
The queue where the routine should be executed.
- n
-
Number of elements in vectors x and y.
- alpha
-
Specifies the scalar alpha.
- 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 between two consecutive elements of vector x.
- beta
-
Specifies the scalar beta.
- 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 between two consecutive elements of vector y.
Output Parameters
- y
-
Buffer holding updated vector y.
axpby (USM Version)
Syntax
namespace oneapi::mkl::blas::column_major {
sycl::event axpby(sycl::queue &queue,
std::int64_t n,
oneapi::mkl::value_or_pointer<T> alpha,
const T *x,
std::int64_t incx,
oneapi::mkl::value_or_pointer<T> beta,
T *y,
std::int64_t incy,
const std::vector<event> &dependencies = {});
}
namespace oneapi::mkl::blas::row_major {
sycl::event axpby(sycl::queue &queue,
std::int64_t n,
oneapi::mkl::value_or_pointer<T> alpha,
const T *x,
std::int64_t incx,
oneapi::mkl::value_or_pointer<T> beta,
T *y,
std::int64_t incy,
const std::vector<event> &dependencies = {});
}
Input Parameters
- queue
-
The queue where the routine should be executed.
- n
-
Number of elements in vectors x and y.
- alpha
-
Specifies the scalar alpha. See Scalar Arguments for more information on the value_or_pointer data type.
- x
-
Pointer to the input vector x. Size of the array must be at least 1 + (n - 1)*abs(incx)). See Matrix Storage for more details.
- incx
-
Stride between two consecutive elements of vector x.
- beta
-
Specifies the scalar beta. See Scalar Arguments for more information on the value_or_pointer data type.
- y
-
Pointer to the input vector y. Size of the array must be at least 1 + (n - 1)*abs(incy)). See Matrix Storage for more details.
- incy
-
Stride between two consecutive elements of vector y.
- dependencies
-
List of events to wait for before starting computation, if any. If omitted, defaults to no dependencies.
Output Parameters
- y
-
Array holding updated vector y.
Return Values
Output event to wait on to ensure computation is complete.