Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 0.9
  • 09/09/2020
  • Public Content
Contents

cblas_?axpy

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

Syntax

void
cblas_saxpy
(
const
MKL_INT
n
,
const
float
a
,
const
float
*x
,
const
MKL_INT
incx
,
float
*y
,
const
MKL_INT
incy
);
void
cblas_daxpy
(
const
MKL_INT
n
,
const
double
a
,
const
double
*x
,
const
MKL_INT
incx
,
double
*y
,
const
MKL_INT
incy
);
void
cblas_caxpy
(
const
MKL_INT
n
,
const
void
*a
,
const
void
*x
,
const
MKL_INT
incx
,
void
*y
,
const
MKL_INT
incy
);
void
cblas_zaxpy
(
const
MKL_INT
n
,
const
void
*a
,
const
void
*x
,
const
MKL_INT
incx
,
void
*y
,
const
MKL_INT
incy
);
Include Files
  • mkl.h
Description
The
?axpy
 routines perform a vector-vector operation defined as 
y := a*x + y
where:
a
 is a scalar
x
 and
y
 are vectors each with a number of elements that equals
n
.
Input Parameters
n
Specifies the number of elements in vectors
x
 and
y
.
a
Specifies the scalar
a
.
x
Array, size at least
(1 + (
n
-1)*abs(
incx
))
.
incx
Specifies the increment for the elements of
x
.
y
Array, size at least
(1 + (
n
-1)*abs(
incy
))
.
incy
Specifies the increment for the elements of
y
.
Output Parameters
y
Contains the 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