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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  addition,  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
	       already 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
	       contains	 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
	       contains	  the  inverse of the logarithmic mapping contained in
	       IMAP: For i in [0.. NPROW) IMAPM1[IMAP[i]] = i.

SEE ALSO
       HPL_pdlaswp01N (3).

HPL 2.1			       October 26, 2012			  HPL_rollN(3)

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