Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

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

cblas_?dot

Computes a vector-vector dot product.

Syntax

float
cblas_sdot
(
const
MKL_INT
n
,
const
float
*x
,
const
MKL_INT
incx
,
const
float
*y
,
const
MKL_INT
incy
);
double
cblas_ddot
(
const
MKL_INT
n
,
const
double
*x
,
const
MKL_INT
incx
,
const
double
*y
,
const
MKL_INT
incy
);
Include Files
  • mkl.h
Description
The
?dot
 routines perform a vector-vector reduction operation defined as
Equation
where
x
i
 and
y
i
 are elements of vectors
x
 and
y
.
Input Parameters
n
Specifies the number of elements in vectors
x
 and
y
.
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
.
Return Values
The result of the dot product of
x
 and
y
, if
n
 is positive. Otherwise, returns 0.

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