/* --------------------------------------------------------------------- * * -- PBLAS auxiliary 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 PB_Ctzhemv( PBTYP_T * TYPE, char * SIDE, char * UPLO, int M, int N, int K, int IOFFD, char * ALPHA, char * A, int LDA, char * XC, int LDXC, char * XR, int LDXR, char * YC, int LDYC, char * YR, int LDYR ) #else void PB_Ctzhemv( TYPE, SIDE, UPLO, M, N, K, IOFFD, ALPHA, A, LDA, XC, LDXC, XR, LDXR, YC, LDYC, YR, LDYR ) /* * .. Scalar Arguments .. */ char * SIDE, * UPLO; int IOFFD, K, LDA, LDXC, LDXR, LDYC, LDYR, M, N; char * ALPHA; /* * .. Array Arguments .. */ PBTYP_T * TYPE; char * A, * XC, * XR, * YC, * YR; #endif { /* * Purpose * ======= * * PB_Ctzhemv performs the matrix-vector operation * * y := alpha * A * x + y, * * where alpha is a scalar, x and y are n element vectors and A is an m * by n trapezoidal symmetric or Hermitian matrix. * * Arguments * ========= * * TYPE (local input) pointer to a PBTYP_T structure * On entry, TYPE is a pointer to a structure of type PBTYP_T, * that contains type information (See pblas.h). * * SIDE (dummy) pointer to CHAR * In this routine, SIDE is a dummy (unused) argument. * * UPLO (input) pointer to CHAR * On entry, UPLO specifies which part of the matrix A is to be * referenced as follows: * * UPLO = 'L' or 'l' the lower trapezoid of A is referenced, * * UPLO = 'U' or 'u' the upper trapezoid of A is referenced, * * otherwise all of the matrix A is referenced. * * M (input) INTEGER * On entry, M specifies the number of rows of the matrix A. M * must be at least zero. * * N (input) INTEGER * On entry, N specifies the number of columns of the matrix A. * N must be at least zero. * * K (dummy) INTEGER * In this routine, K is a dummy (unused) argument. * * IOFFD (input) INTEGER * On entry, IOFFD specifies the position of the offdiagonal de- * limiting the upper and lower trapezoidal part of A as follows * (see the notes below): * * IOFFD = 0 specifies the main diagonal A( i, i ), * with i = 1 ... MIN( M, N ), * IOFFD > 0 specifies the subdiagonal A( i+IOFFD, i ), * with i = 1 ... MIN( M-IOFFD, N ), * IOFFD < 0 specifies the superdiagonal A( i, i-IOFFD ), * with i = 1 ... MIN( M, N+IOFFD ). * * ALPHA (input) pointer to CHAR * On entry, ALPHA specifies the scalar alpha. * * A (input) pointer to CHAR * On entry, A is an array of dimension (LDA,N) containing the m * by n matrix A. Only the trapezoidal part of A determined by * UPLO and IOFFD is referenced. * * LDA (input) INTEGER * On entry, LDA specifies the leading dimension of the array A. * LDA must be at least max( 1, M ). * * XC (input) pointer to CHAR * On entry, XC is an array of dimension (LDXC,1) containing the * m by 1 vector XC. * * LDXC (input) INTEGER * On entry, LDXC specifies the leading dimension of the array * XC. LDXC must be at least max( 1, M ). * * XR (input) pointer to CHAR * On entry, XR is an array of dimension (LDXR,N) containing the * 1 by n vector XR. * * LDXR (input) INTEGER * On entry, LDXR specifies the leading dimension of the array * XR. LDXR must be at least 1. * * YC (input/output) pointer to CHAR * On entry, YC is an array of dimension (LDYC,1) containing the * m by 1 vector YC. On exit, YC is overwritten by the partially * updated vector y. * * LDYC (input) INTEGER * On entry, LDYC specifies the leading dimension of the array * YC. LDYC must be at least max( 1, M ). * * YR (input/output) pointer to CHAR * On entry, YR is an array of dimension (LDYR,N) containing the * 1 by n vector YR. On exit, YR is overwritten by the partially * updated vector y. * * LDYR (input) INTEGER * On entry, LDYR specifies the leading dimension of the array * YR. LDYR must be at least 1. * * Notes * ===== * N N * ---------------------------- ----------- * | d | | | * M | d Upper | | Upper | * | Lower d | |d | * | d | M | d | * ---------------------------- | d | * | d | * IOFFD < 0 | Lower d | * | d| * N | | * ----------- ----------- * | d Upper| * | d | IOFFD > 0 * M | d | * | d| N * | Lower | ---------------------------- * | | | Upper | * | | |d | * | | | d | * | | | d | * | | |Lower d | * ----------- ---------------------------- * * -- Written on April 1, 1998 by * Antoine Petitet, University of Tennessee, Knoxville 37996, USA. * * --------------------------------------------------------------------- */ /* * .. Local Scalars .. */ char * one; int i1, ione=1, j1, m1, mn, n1, size; GEMV_T gemv; /* .. * .. Executable Statements .. * */ if( ( M <= 0 ) || ( N <= 0 ) ) return; if( Mupcase( UPLO[0] ) == CLOWER ) { size = TYPE->size; one = TYPE->one; gemv = TYPE->Fgemv; mn = MAX( 0, -IOFFD ); if( ( n1 = MIN( mn, N ) ) > 0 ) { gemv( C2F_CHAR( NOTRAN ), &M, &n1, ALPHA, A, &LDA, XR, &LDXR, one, YC, &ione ); gemv( C2F_CHAR( COTRAN ), &M, &n1, ALPHA, A, &LDA, XC, &ione, one, YR, &LDYR ); } n1 = M - IOFFD; if( ( n1 = MIN( n1, N ) - mn ) > 0 ) { i1 = ( j1 = mn ) + IOFFD; TYPE->Fhemv( C2F_CHAR( UPLO ), &n1, ALPHA, Mptr( A, i1, j1, LDA, size ), &LDA, Mptr( XC, i1, 0, LDXC, size ), &ione, one, Mptr( YC, i1, 0, LDYC, size ), &ione ); if( ( m1 = M - mn - n1 - IOFFD ) > 0 ) { i1 += n1; gemv( C2F_CHAR( NOTRAN ), &m1, &n1, ALPHA, Mptr( A, i1, j1, LDA, size ), &LDA, Mptr( XR, 0, j1, LDXR, size ), &LDXR, one, Mptr( YC, i1, 0, LDYC, size ), &ione ); gemv( C2F_CHAR( COTRAN ), &m1, &n1, ALPHA, Mptr( A, i1, j1, LDA, size ), &LDA, Mptr( XC, i1, 0, LDXC, size ), &ione, one, Mptr( YR, 0, j1, LDYR, size ), &LDYR ); } } } else if( Mupcase( UPLO[0] ) == CUPPER ) { size = TYPE->size; one = TYPE->one; gemv = TYPE->Fgemv; mn = M - IOFFD; mn = MIN( mn, N ); if( ( n1 = mn - MAX( 0, -IOFFD ) ) > 0 ) { j1 = mn - n1; if( ( m1 = MAX( 0, IOFFD ) ) > 0 ) { gemv( C2F_CHAR( NOTRAN ), &m1, &n1, ALPHA, A, &LDA, XR, &LDXR, one, YC, &ione ); gemv( C2F_CHAR( COTRAN ), &m1, &n1, ALPHA, A, &LDA, XC, &ione, one, YR, &LDYR ); } TYPE->Fhemv( C2F_CHAR( UPLO ), &n1, ALPHA, Mptr( A, m1, j1, LDA, size ), &LDA, Mptr( XC, m1, 0, LDXC, size ), &ione, one, Mptr( YC, m1, 0, LDYC, size ), &ione ); } if( ( n1 = N - MAX( 0, mn ) ) > 0 ) { j1 = N - n1; gemv( C2F_CHAR( NOTRAN ), &M, &n1, ALPHA, Mptr( A, 0, j1, LDA, size ), &LDA, Mptr( XR, 0, j1, LDXR, size ), &LDXR, one, YC, &ione ); gemv( C2F_CHAR( COTRAN ), &M, &n1, ALPHA, Mptr( A, 0, j1, LDA, size ), &LDA, XC, &ione, one, Mptr( YR, 0, j1, LDYR, size ), &LDYR ); } } else { one = TYPE->one; gemv = TYPE->Fgemv; gemv( C2F_CHAR( NOTRAN ), &M, &N, ALPHA, A, &LDA, XR, &LDXR, one, YC, &ione ); gemv( C2F_CHAR( COTRAN ), &M, &N, ALPHA, A, &LDA, XC, &ione, one, YR, &LDYR ); } /* * End of PB_Ctzhemv */ }