Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

ID 766686
Date 3/31/2023
Public

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?gsum2d

Performs element-wise summation.

Syntax

call igsum2d( icontxt, scope, top, m, n, a, lda, rdest, cdest )

call sgsum2d( icontxt, scope, top, m, n, a, lda, rdest, cdest )

call dgsum2d( icontxt, scope, top, m, n, a, lda, rdest, cdest )

call cgsum2d( icontxt, scope, top, m, n, a, lda, rdest, cdest )

call zgsum2d( icontxt, scope, top, m, n, a, lda, rdest, cdest )

Input Parameters

icontxt

INTEGER. Integer handle that indicates the context.

scope

CHARACTER*1. Indicates what scope the combine should proceed on. Limited to ROW, COLUMN, or ALL.

top

CHARACTER*1. Communication pattern to use during the combine operation.

m

INTEGER. The number of matrix rows to be combined.

n

INTEGER. The number of matrix columns to be combined.

a

TYPE array (lda, n). Matrix to be added to produce the sum.

lda

INTEGER. The leading dimension of the matrix A, that is, the distance between two successive elements in a matrix row.

rdest

INTEGER.

The process row coordinate of the process that should receive the result. If rdest or cdest = -1, all processes within the indicated scope receive the answer.

cdest

INTEGER.

The process column coordinate of the process that should receive the result. If rdest or cdest = -1, all processes within the indicated scope receive the answer.

Output Parameters

a

TYPE array (lda, n). Contains the result if this process is selected to receive the answer, or intermediate results if the process is not selected to receive the result.

Description

This routine performs element-wise summation, that is, each element of matrix A is summed with the corresponding element of the other process's matrices. Combines may be globally-blocking, so they must be programmed as if no process returns until all have called the routine.