Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 0.9
  • 09/09/2020
  • 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

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804