Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

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

p?lacp2

Copies all or part of a distributed matrix to another distributed matrix.

Syntax

void
pslacp2
(
char
*uplo
,
MKL_INT
*m
,
MKL_INT
*n
,
float
*a
,
MKL_INT
*ia
,
MKL_INT
*ja
,
MKL_INT
*desca
,
float
*b
,
MKL_INT
*ib
,
MKL_INT
*jb
,
MKL_INT
*descb
);
void
pdlacp2
(
char
*uplo
,
MKL_INT
*m
,
MKL_INT
*n
,
double
*a
,
MKL_INT
*ia
,
MKL_INT
*ja
,
MKL_INT
*desca
,
double
*b
,
MKL_INT
*ib
,
MKL_INT
*jb
,
MKL_INT
*descb
);
void
pclacp2
(
char
*uplo
,
MKL_INT
*m
,
MKL_INT
*n
,
MKL_Complex8
*a
,
MKL_INT
*ia
,
MKL_INT
*ja
,
MKL_INT
*desca
,
MKL_Complex8
*b
,
MKL_INT
*ib
,
MKL_INT
*jb
,
MKL_INT
*descb
);
void
pzlacp2
(
char
*uplo
,
MKL_INT
*m
,
MKL_INT
*n
,
MKL_Complex16
*a
,
MKL_INT
*ia
,
MKL_INT
*ja
,
MKL_INT
*desca
,
MKL_Complex16
*b
,
MKL_INT
*ib
,
MKL_INT
*jb
,
MKL_INT
*descb
);
Include Files
  • mkl_scalapack.h
Description
The
p?lacp2
function
copies all or part of a distributed matrix
A
to another distributed matrix
B
. No communication is performed,
p?lacp2
 performs a local copy sub(
A
):= sub(
B
), where sub(
A
) denotes
A
(
ia
:
ia
+
m
-1
,
a
:
ja
+
n
-1)
 and sub(
B
) denotes
B
(
ib
:
ib
+
m
-1
,
jb
:
jb
+
n
-1)
.
p?lacp2
 requires that only dimension of the matrix operands is distributed.
Input Parameters
uplo
(global) Specifies the part of the distributed matrix sub(
A
) to be copied:
=
'U'
: Upper triangular part is copied; the strictly lower triangular part of sub(
A
) is not referenced;
=
'L'
: Lower triangular part is copied; the strictly upper triangular part of sub(
A
) is not referenced.
Otherwise: all of the matrix sub(
A
) is copied.
m
(global)
The number of rows in the distributed matrix sub(
A
).
(
m
≥
 0)
.
n
(global)
The number of columns in the distributed matrix sub(
A
).
(
n
≥
 0)
.
a
(local).
Pointer into the local memory to an array of size
lld_a
 *
LOCc
(
ja
+
n
-1)
.
On entry, this array contains the local pieces of the
m
-by-
n
 distributed matrix sub(
A
).
ia
,
ja
(global) The row and column indices in the global matrix
A
 indicating the first row and the first column of sub(
A
), respectively.
desca
(global and local) array of size
dlen_
. The array descriptor for the distributed matrix
A
.
ib
,
jb
(global) The row and column indices in the global matrix
B
 indicating the first row and the first column of sub(
B
), respectively.
descb
(global and local) array of size
dlen_
. The array descriptor for the distributed matrix
B
.
Output Parameters
b
(local).
Pointer into the local memory to an array of size
lld_b
 *
LOCc
(
jb
+
n
-1)
. This array contains on exit the local pieces of the distributed matrix sub(
B
 ) set as follows:
if
uplo
 =
'U'
,
B
(
ib
+
i
-1,
jb
+
j
-1) =
A
(
ia
+
i
-1,
ja
+
j
-1), 1≤
i
≤
j
, 1≤
j
≤
n
;
if
uplo
 =
'L'
,
B
(
ib
+
i
-1,
jb
+
j
-1) =
A
(
ia
+
i
-1,
ja
+
j
-1),
j
≤
i
≤
m
, 1≤
j
≤
n
;
otherwise,
B
(
ib
+
i
-1,
jb
+
j
-1) =
A
(
ia
+
i
-1,
ja
+
j
-1), 1≤
i
≤
m
, 1≤
j
≤
n
.

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