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HPL_rollN(3)		      HPL Library Functions		    HPL_rollN(3)

NAME
     HPL_rollN - Roll U and forward the column panel.

SYNOPSIS
     #include "hpl.h"

     void  HPL_rollN(  HPL_T_panel  *  PBCST,  int * IFLAG, HPL_T_panel * PANEL,
     const int N, double * U, const int LDU, const int	*  IPLEN,  const  int  *
     IPMAP, const int * IPMAPM1 );

DESCRIPTION
     HPL_rollN	rolls the local arrays containing the local pieces of U, so that
     on exit to this function  U  is replicated in every process row.  In  addi-
     tion, this function probe for the presence of the column panel and forwards
     it when available.

ARGUMENTS
     PBCST   (local input/output)    HPL_T_panel *
	     On entry,	PBCST  points to the data structure containing the panel
	     (to be broadcast) information.

     IFLAG   (local input/output)    int *
	     On  entry,  IFLAG	indicates  whether or not  the broadcast has al-
	     ready been completed.  If not,  probing will occur, and the outcome
	     will be contained in IFLAG on exit.

     PANEL   (local input/output)    HPL_T_panel *
	     On entry,	PANEL  points to the data structure containing the panel
	     (to be rolled) information.

     N	     (local input)	     const int
	     On entry, N specifies the number of columns of  U.  N  must  be  at
	     least zero.

     U	     (local input/output)    double *
	     On entry,	U  is an array of dimension (LDU,*) containing the local
	     pieces of U in each process row.

     LDU     (local input)	     const int
	     On  entry,  LDU  specifies  the  local  leading dimension of U. LDU
	     should be at least  MAX(1,IPLEN[NPROW]).

     IPLEN   (global input)	     const int *
	     On entry, IPLEN is an array of dimension NPROW+1.	 This  array  is
	     such  that IPLEN[i+1] - IPLEN[i] is the number of rows of U in each
	     process row.

     IPMAP   (global input)	     const int *
	     On entry, IMAP  is an array of dimension  NPROW.  This  array  con-
	     tains   the   logarithmic mapping of the processes. In other words,
	     IMAP[myrow]  is the absolute coordinate of the sorted process.

     IPMAPM1 (global input)	     const int *
	     On entry,	IMAPM1	is an array of dimension NPROW. This array  con-
	     tains   the  inverse  of the logarithmic mapping contained in IMAP:
	     For i in [0.. NPROW) IMAPM1[IMAP[i]] = i.

SEE ALSO
     HPL_pdlaswp01N (3).

HPL 2.3 			December 2, 2018		    HPL_rollN(3)

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