Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 2021.1
  • 12/04/2020
  • Public Content
Contents

cblas_?axpy_batch_strided

Computes a group of vector-scalar products added to a vector.

Syntax

void
cblas_saxpy_batch_strided
(
const
MKL_INT
n
,
const
float
alpha
,
const
float
*x
,
const
MKL_INT
incx
,
const
MKL_INT
stridex
,
float
*y
,
const
MKL_INT
incy
,
const
MKL_INT
stridey
,
const MKL_INT
batch_size
);
void
cblas_daxpy_batch_strided
(
const
MKL_INT
n
,
const
double
alpha
,
const
double
*x
,
const
MKL_INT
incx
,
const
MKL_INT
stridex
,
double
*y
,
const
MKL_INT
incy
,
const
MKL_INT
stridey
,
const MKL_INT
batch_size
);
void
cblas_caxpy_batch_strided
(
const
MKL_INT
n
,
const
void
alpha
,
const
void
*x
,
const
MKL_INT
incx
,
const
MKL_INT
stridex
,
void
*y
,
const
MKL_INT
incy
,
const
MKL_INT
stridey
,
const MKL_INT
batch_size
);
void
cblas_zaxpy_batch_strided
(
const
MKL_INT
n
,
const
void
alpha
,
const
void
*x
,
const
MKL_INT
incx
,
const
MKL_INT
stridex
,
void
*y
,
const
MKL_INT
incy
,
const
MKL_INT
stridey
,
const MKL_INT
batch_size
);
Include Files
  • mkl.h
Description
The
cblas_?axpy_batch_strided
 routines perform a series of scalar-vector product added to a vector. They are similar to the
cblas_?axpy
 routine counterparts, but the
cblas_?axpy_batch_strided
 routines perform vector operations with a group of vectors.
All vector
x
 (respectively,
y
) have the same parameters (size, increments) and are stored at constant
stridex
 (respectively,
stridey
) from each other. The operation is defined as
For i = 0 … batch_size – 1
    X and Y are vectors at offset i * stridex and i * stridey in x and y
    Y = alpha * X + Y
end for
Input Parameters
n
Number of elements in vectors
x
 and
y
.
alpha
Specifies the scalar
alpha
.
x
Array of size at least
stridex
*
batch_size
 holding the
x
 vectors.
incx
Specifies the increment for the elements of
x
.
stridex
Stride between two consecutive
x
 vectors, must be at least (1 + (n-1)*abs(
incx
)).
y
Array of size at least
stridey
*
batch_size
 holding the
y
 vectors.
incy
Specifies the increment for the elements of
y
.
stridey
Stride between two consecutive
y
 vectors, must be at least (1 + (n-1)*abs(
incy
)).
batch_size
Number of
axpy
 computations to perform and
x
 and
y
 vectors. Must be at least 0.
Output Parameters
y
Array holding the
batch_size
 updated vector
y
.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.