/* --------------------------------------------------------------------- * * -- PBLAS routine (version 2.0) -- * University of Tennessee, Knoxville, Oak Ridge National Laboratory, * and University of California, Berkeley. * April 1, 1998 * * --------------------------------------------------------------------- */ /* * Include files */ #include "pblas.h" #include "PBpblas.h" #include "PBtools.h" #include "PBblacs.h" #include "PBblas.h" #ifdef __STDC__ void pzcopy_( int * N, double * X, int * IX, int * JX, int * DESCX, int * INCX, double * Y, int * IY, int * JY, int * DESCY, int * INCY ) #else void pzcopy_( N, X, IX, JX, DESCX, INCX, Y, IY, JY, DESCY, INCY ) /* * .. Scalar Arguments .. */ int * INCX, * INCY, * IX, * IY, * JX, * JY, * N; /* * .. Array Arguments .. */ int * DESCX, * DESCY; double * X, * Y; #endif { /* * Purpose * ======= * * PZCOPY copies one subvector into another, * * sub( Y ) := sub( X ), * * where * * sub( X ) denotes X(IX,JX:JX+N-1) if INCX = M_X, * X(IX:IX+N-1,JX) if INCX = 1 and INCX <> M_X, and, * * sub( Y ) denotes Y(IY,JY:JY+N-1) if INCY = M_Y, * Y(IY:IY+N-1,JY) if INCY = 1 and INCY <> M_Y. * * Notes * ===== * * A description vector is associated with each 2D block-cyclicly dis- * tributed matrix. This vector stores the information required to * establish the mapping between a matrix entry and its corresponding * process and memory location. * * In the following comments, the character _ should be read as * "of the distributed matrix". Let A be a generic term for any 2D * block cyclicly distributed matrix. Its description vector is DESC_A: * * NOTATION STORED IN EXPLANATION * ---------------- --------------- ------------------------------------ * DTYPE_A (global) DESCA[ DTYPE_ ] The descriptor type. * CTXT_A (global) DESCA[ CTXT_ ] The BLACS context handle, indicating * the NPROW x NPCOL BLACS process grid * A is distributed over. The context * itself is global, but the handle * (the integer value) may vary. * M_A (global) DESCA[ M_ ] The number of rows in the distribu- * ted matrix A, M_A >= 0. * N_A (global) DESCA[ N_ ] The number of columns in the distri- * buted matrix A, N_A >= 0. * IMB_A (global) DESCA[ IMB_ ] The number of rows of the upper left * block of the matrix A, IMB_A > 0. * INB_A (global) DESCA[ INB_ ] The number of columns of the upper * left block of the matrix A, * INB_A > 0. * MB_A (global) DESCA[ MB_ ] The blocking factor used to distri- * bute the last M_A-IMB_A rows of A, * MB_A > 0. * NB_A (global) DESCA[ NB_ ] The blocking factor used to distri- * bute the last N_A-INB_A columns of * A, NB_A > 0. * RSRC_A (global) DESCA[ RSRC_ ] The process row over which the first * row of the matrix A is distributed, * NPROW > RSRC_A >= 0. * CSRC_A (global) DESCA[ CSRC_ ] The process column over which the * first column of A is distributed. * NPCOL > CSRC_A >= 0. * LLD_A (local) DESCA[ LLD_ ] The leading dimension of the local * array storing the local blocks of * the distributed matrix A, * IF( Lc( 1, N_A ) > 0 ) * LLD_A >= MAX( 1, Lr( 1, M_A ) ) * ELSE * LLD_A >= 1. * * Let K be the number of rows of a matrix A starting at the global in- * dex IA,i.e, A( IA:IA+K-1, : ). Lr( IA, K ) denotes the number of rows * that the process of row coordinate MYROW ( 0 <= MYROW < NPROW ) would * receive if these K rows were distributed over NPROW processes. If K * is the number of columns of a matrix A starting at the global index * JA, i.e, A( :, JA:JA+K-1, : ), Lc( JA, K ) denotes the number of co- * lumns that the process MYCOL ( 0 <= MYCOL < NPCOL ) would receive if * these K columns were distributed over NPCOL processes. * * The values of Lr() and Lc() may be determined via a call to the func- * tion PB_Cnumroc: * Lr( IA, K ) = PB_Cnumroc( K, IA, IMB_A, MB_A, MYROW, RSRC_A, NPROW ) * Lc( JA, K ) = PB_Cnumroc( K, JA, INB_A, NB_A, MYCOL, CSRC_A, NPCOL ) * * Arguments * ========= * * N (global input) INTEGER * On entry, N specifies the length of the subvectors to be * copied. N must be at least zero. * * X (local input) COMPLEX*16 array * On entry, X is an array of dimension (LLD_X, Kx), where LLD_X * is at least MAX( 1, Lr( 1, IX ) ) when INCX = M_X and * MAX( 1, Lr( 1, IX+N-1 ) ) otherwise, and, Kx is at least * Lc( 1, JX+N-1 ) when INCX = M_X and Lc( 1, JX ) otherwise. * Before entry, this array contains the local entries of the * matrix X. * * IX (global input) INTEGER * On entry, IX specifies X's global row index, which points to * the beginning of the submatrix sub( X ). * * JX (global input) INTEGER * On entry, JX specifies X's global column index, which points * to the beginning of the submatrix sub( X ). * * DESCX (global and local input) INTEGER array * On entry, DESCX is an integer array of dimension DLEN_. This * is the array descriptor for the matrix X. * * INCX (global input) INTEGER * On entry, INCX specifies the global increment for the * elements of X. Only two values of INCX are supported in * this version, namely 1 and M_X. INCX must not be zero. * * Y (local output) COMPLEX*16 array * On entry, Y is an array of dimension (LLD_Y, Ky), where LLD_Y * is at least MAX( 1, Lr( 1, IY ) ) when INCY = M_Y and * MAX( 1, Lr( 1, IY+N-1 ) ) otherwise, and, Ky is at least * Lc( 1, JY+N-1 ) when INCY = M_Y and Lc( 1, JY ) otherwise. * Before entry, this array contains the local entries of the * matrix Y. On exit, sub( Y ) is overwritten with sub( X ). * * IY (global input) INTEGER * On entry, IY specifies Y's global row index, which points to * the beginning of the submatrix sub( Y ). * * JY (global input) INTEGER * On entry, JY specifies Y's global column index, which points * to the beginning of the submatrix sub( Y ). * * DESCY (global and local input) INTEGER array * On entry, DESCY is an integer array of dimension DLEN_. This * is the array descriptor for the matrix Y. * * INCY (global input) INTEGER * On entry, INCY specifies the global increment for the * elements of Y. Only two values of INCY are supported in * this version, namely 1 and M_Y. INCY must not be zero. * * -- Written on April 1, 1998 by * Antoine Petitet, University of Tennessee, Knoxville 37996, USA. * * --------------------------------------------------------------------- */ /* * .. Local Scalars .. */ int Xi, Xj, Yi, Yj, ctxt, info, mycol, myrow, npcol, nprow; PBTYP_T * type; /* * .. Local Arrays .. */ int Xd[DLEN_], Yd[DLEN_]; /* .. * .. Executable Statements .. * */ PB_CargFtoC( *IX, *JX, DESCX, &Xi, &Xj, Xd ); PB_CargFtoC( *IY, *JY, DESCY, &Yi, &Yj, Yd ); #ifndef NO_ARGCHK /* * Test the input parameters */ Cblacs_gridinfo( ( ctxt = Xd[CTXT_] ), &nprow, &npcol, &myrow, &mycol ); if( !( info = ( ( nprow == -1 ) ? -( 501 + CTXT_ ) : 0 ) ) ) { PB_Cchkvec( ctxt, "PZCOPY", "X", *N, 1, Xi, Xj, Xd, *INCX, 5, &info ); PB_Cchkvec( ctxt, "PZCOPY", "Y", *N, 1, Yi, Yj, Yd, *INCY, 10, &info ); } if( info ) { PB_Cabort( ctxt, "PZCOPY", info ); return; } #endif /* * Quick return if possible */ if( *N == 0 ) return; /* * Get type structure */ type = PB_Cztypeset(); /* * Start the operations */ if( *INCX == Xd[M_] ) { PB_Cpaxpby( type, NOCONJG, 1, *N, type->one, ((char *) X), Xi, Xj, Xd, ROW, type->zero, ((char *) Y), Yi, Yj, Yd, ( *INCY == Yd[M_] ? ROW : COLUMN ) ); } else { PB_Cpaxpby( type, NOCONJG, *N, 1, type->one, ((char *) X), Xi, Xj, Xd, COLUMN, type->zero, ((char *) Y), Yi, Yj, Yd, ( *INCY == Yd[M_] ? ROW : COLUMN ) ); } /* * End of PZCOPY */ }