void ATL_zrefhpmvL
(
const int N,
const double * ALPHA,
const double * A,
const int LDA,
const double * X,
const int INCX,
const double * BETA,
double * Y,
const int INCY
)
{
/*
* Purpose
* =======
*
* ATL_zrefhpmvL( ... )
*
* <=>
*
* ATL_zrefhpmv( AtlasLower, ... )
*
* See ATL_zrefhpmv for details.
*
* ---------------------------------------------------------------------
*/
/*
* .. Local Variables ..
*/
register double t0_i, t0_r, t1_i, t1_r;
int i, iaij, ix, iy, j, jaj = 0, jx, jy,
lda2 = ( LDA << 1 ), incx2 = 2 * INCX,
incy2 = 2 * INCY;
/* ..
* .. Executable Statements ..
*
*/
Mzvscal( N, BETA, Y, INCY );
for( j = 0, jx = 0, jy = 0; j < N; j++, jx += incx2, jy += incy2 )
{
Mmul( ALPHA[0], ALPHA[1], X[jx], X[jx+1], t0_r, t0_i );
Mset( ATL_dZERO, ATL_dZERO, t1_r, t1_i );
Mset( Y[jy] + A[jaj]*t0_r, Y[jy+1] + A[jaj]*t0_i, Y[jy], Y[jy+1] );
for( i = j+1, iaij = jaj+2, ix = jx+incx2, iy = jy+incy2;
i < N; i++, iaij += 2, ix += incx2, iy += incy2 )
{
Mmla( A[iaij], A[iaij+1], t0_r, t0_i, Y[iy], Y[iy+1] );
Mmla( A[iaij], -A[iaij+1], X[ix], X[ix+1], t1_r, t1_i );
}
Mmla( ALPHA[0], ALPHA[1], t1_r, t1_i, Y[jy], Y[jy+1] );
jaj += lda2;
lda2 -= 2;
}
/*
* End of ATL_zrefhpmvL
*/
}
void ATL_zrefgbmvN
(
const int M,
const int N,
const int KL,
const int KU,
const double * ALPHA,
const double * A,
const int LDA,
const double * X,
const int INCX,
const double * BETA,
double * Y,
const int INCY
)
{
/*
* Purpose
* =======
*
* ATL_zrefgbmvN( ... ) <=> ATL_zrefgbmv( AtlasNoTrans, ... )
*
* See ATL_zrefgbmv for details.
*
* ---------------------------------------------------------------------
*/
/*
* .. Local Variables ..
*/
register double t0_i, t0_r;
int i, i0, i1, iaij, iy, j, jaj, jx, k, kx=0, ky=0;
int incx2 = 2 * INCX, incy2 = 2 * INCY,
lda2 = ( LDA << 1 );
/* ..
* .. Executable Statements ..
*
*/
Mzvscal( M, BETA, Y, INCY );
for( j = 0, jaj = 0, jx = kx; j < N; j++, jaj += lda2, jx += incx2 )
{
Mmul( ALPHA[0], ALPHA[1], X[jx], X[jx+1], t0_r, t0_i );
k = KU - j; i0 = ( j - KU > 0 ? j - KU : 0 );
i1 = ( M - 1 > j + KL ? j + KL : M - 1 );
for( i = i0, iaij = ((k+i0) << 1)+jaj, iy = ky; i <= i1;
i++, iaij += 2, iy += incy2 )
{ Mmla( A[iaij], A[iaij+1], t0_r, t0_i, Y[iy], Y[iy+1] ); }
if( j >= KU ) ky += incy2;
}
/*
* End of ATL_zrefgbmvN
*/
}
void ATL_zrefsyrkUN
(
const int N,
const int K,
const double * ALPHA,
const double * A,
const int LDA,
const double * BETA,
double * C,
const int LDC
)
{
/*
* Purpose
* =======
*
* ATL_zrefsyrkUN( ... )
*
* <=>
*
* ATL_zrefsyrk( AtlasUpper, AtlasNoTrans, ... )
*
* See ATL_zrefsyrk for details.
*
* ---------------------------------------------------------------------
*/
/*
* .. Local Variables ..
*/
register double t0_i, t0_r;
int i, iail, iaj, iajl, icij, j, jal, jcj, l,
lda2 = ( LDA << 1 ), ldc2 = ( LDC << 1 );
/* ..
* .. Executable Statements ..
*
*/
for( j = 0, iaj = 0, jcj = 0; j < N; j++, iaj += 2, jcj += ldc2 )
{
Mzvscal( j+1, BETA, C+jcj, 1 );
for( l = 0, iajl = iaj, jal = 0; l < K; l++, iajl += lda2, jal += lda2 )
{
Mmul( ALPHA[0], ALPHA[1], A[iajl], A[iajl+1], t0_r, t0_i );
for( i = 0, iail = jal, icij = jcj; i <= j; i++, iail += 2, icij += 2 )
{ Mmla( t0_r, t0_i, A[iail], A[iail+1], C[icij], C[icij+1] ); }
}
}
/*
* End of ATL_zrefsyrkUN
*/
}
void ATL_zrefgemvN
(
const int M,
const int N,
const double * ALPHA,
const double * A,
const int LDA,
const double * X,
const int INCX,
const double * BETA,
double * Y,
const int INCY
)
{
/*
* Purpose
* =======
*
* ATL_zrefgemvN( ... ) <=> ATL_zrefgemv( AtlasNoTrans, ... )
*
* See ATL_zrefgemv for details.
*
* ---------------------------------------------------------------------
*/
/*
* .. Local Variables ..
*/
register double t0_i, t0_r;
int i, iaij, iy, j, jaj, jx;
int incx2 = 2 * INCX, incy2 = 2 * INCY,
lda2 = ( LDA << 1 );
/* ..
* .. Executable Statements ..
*
*/
Mzvscal( M, BETA, Y, INCY );
for( j = 0, jaj = 0, jx = 0; j < N; j++, jaj += lda2, jx += incx2 )
{
Mmul( ALPHA[0], ALPHA[1], X[jx], X[jx+1], t0_r, t0_i );
for( i = 0, iaij = jaj, iy = 0; i < M; i++, iaij += 2, iy += incy2 )
{ Mmla( A[iaij], A[iaij+1], t0_r, t0_i, Y[iy], Y[iy+1] ); }
}
/*
* End of ATL_zrefgemvN
*/
}
void ATL_zrefhpmv
(
const enum ATLAS_UPLO UPLO,
const int N,
const double * ALPHA,
const double * A,
const double * X,
const int INCX,
const double * BETA,
double * Y,
const int INCY
)
{
/*
* Purpose
* =======
*
* ATL_zrefhpmv performs the matrix-vector operation
*
* y := alpha * A * x + beta * y,
*
* where alpha and beta are scalars, x and y are n-element vectors and A
* is an n by n Hermitian matrix, supplied in packed form.
*
* Arguments
* =========
*
* UPLO (input) const enum ATLAS_UPLO
* On entry, UPLO specifies whether the upper or lower triangu-
* lar part of the matrix A is supplied in the packed array A
* as follows:
*
* UPLO = AtlasUpper The upper triangular part of A is
* supplied in A.
*
* UPLO = AtlasLower The lower triangular part of A is
* supplied in A.
*
* Unchanged on exit.
*
* N (input) const int
* On entry, N specifies the order of the matrix A. N must be at
* least zero. Unchanged on exit.
*
* ALPHA (input) const double *
* On entry, ALPHA specifies the scalar alpha. When ALPHA is
* supplied as zero then A and X need not be set on input. Un-
* changed on exit.
*
* A (input) const double *
* On entry, A points to an array of size equal to or greater
* than (( n*(n+1) ) / 2) * sizeof( double[2] ). Before entry
* with UPLO = AtlasUpper, the array A must contain the upper
* triangular part of the Hermitian matrix packed sequentially,
* column by column, so that A[ 0 ] contains a(0,0), A[ 1 ] and
* A[ 2 ] contain a(0,1) and a(1,1) respectively, and so on.
* Before entry with UPLO = AtlasLower, the array A must contain
* the lower triangular part of the Hermitian matrix packed se-
* quentially, column by column, so that A[ 0 ] contains a(0,0),
* A[ 1 ] and A[ 2 ] contain a(1,0) and a(2,0) respectively, and
* so on. Unchanged on exit.
* Note that the imaginary parts of the local entries corres-
* ponding to the diagonal elements of A need not be set and as-
* sumed to be zero. Unchanged on exit.
*
* X (input) const double *
* On entry, X points to the first entry to be accessed of an
* incremented array of size equal to or greater than
* ( 1 + ( n - 1 ) * abs( INCX ) ) * sizeof( double[2] ),
* that contains the vector x. Unchanged on exit.
*
* INCX (input) const int
* On entry, INCX specifies the increment for the elements of X.
* INCX must not be zero. Unchanged on exit.
*
* BETA (input) const double *
* On entry, BETA specifies the scalar beta. When BETA is
* supplied as zero then Y need not be set on input. Unchanged
* on exit.
*
* Y (input/output) double *
* On entry, Y points to the first entry to be accessed of an
* incremented array of size equal to or greater than
* ( 1 + ( n - 1 ) * abs( INCY ) ) * sizeof( double[2] ),
* that contains the vector y. Before entry with BETA non-zero,
* the incremented array Y must contain the vector y. On exit,
* Y is overwritten by the updated vector y.
*
* INCY (input) const int
* On entry, INCY specifies the increment for the elements of Y.
* INCY must not be zero. Unchanged on exit.
*
* ---------------------------------------------------------------------
*/
/* ..
* .. Executable Statements ..
*
*/
if( ( N == 0 ) ||
( Mdzero( ALPHA[0], ALPHA[1] ) && Mdone( BETA[0], BETA[1] ) ) ) return;
if( Mdzero( ALPHA[0], ALPHA[1] ) )
{ Mzvscal( N, BETA, Y, INCY ); return; }
if( UPLO == AtlasUpper )
{
ATL_zrefhpmvU( N, ALPHA, A, 1, X, INCX, BETA, Y, INCY );
}
else
{
ATL_zrefhpmvL( N, ALPHA, A, N, X, INCX, BETA, Y, INCY );
}
/*
* End of ATL_zrefhpmv
*/
}
void ATL_zrefgbmv
(
const enum ATLAS_TRANS TRANS,
const int M,
const int N,
const int KL,
const int KU,
const double * ALPHA,
const double * A,
const int LDA,
const double * X,
const int INCX,
const double * BETA,
double * Y,
const int INCY
)
{
/*
* Purpose
* =======
*
* ATL_zrefgbmv performs one of the matrix-vector operations
*
* y := alpha * op( A ) * x + beta * y,
*
* where op( X ) is one of
*
* op( X ) = X or op( X ) = conjg( X ) or
*
* op( X ) = X' or op( X ) = conjg( X' ).
*
* where alpha and beta are scalars, x and y are vectors and op( A ) is
* an m by n band matrix, with kl sub-diagonals and ku super-diagonals.
*
* Arguments
* =========
*
* TRANS (input) const enum ATLAS_TRANS
* On entry, TRANS specifies the operation to be performed as
* follows:
*
* TRANS = AtlasNoTrans y := alpha*A *x + beta*y,
*
* TRANS = AtlasConj y := alpha*conjg( A )*x + beta*y,
*
* TRANS = AtlasTrans y := alpha*A'*x + beta*y,
*
* TRANS = AtlasConjTrans y := alpha*conjg( A' )*x + beta*y.
*
* Unchanged on exit.
*
* M (input) const int
* On entry, M specifies the number of rows of the matrix A
* when TRANS = AtlasNoTrans or TRANS = AtlasConj, and the num-
* ber of columns of the matrix A otherwise. M must be at least
* zero. Unchanged on exit.
*
* N (input) const int
* On entry, N specifies the number of columns of the matrix A
* when TRANS = AtlasNoTrans or TRANS = AtlasConj, and the num-
* ber of rows of the matrix A otherwise. N must be at least ze-
* ro. Unchanged on exit.
*
* KL (input) const int
* On entry, KL specifies the number of sub-diagonals of the ma-
* trix A. KL must satisfy 0 <= KL. Unchanged on exit.
*
* KU (input) const int
* On entry, KU specifies the number of super-diagonals of the
* matrix A. KU must satisfy 0 <= KU. Unchanged on exit.
*
* ALPHA (input) const double *
* On entry, ALPHA specifies the scalar alpha. When ALPHA is
* supplied as zero then A and X need not be set on input. Un-
* changed on exit.
*
* A (input) const double *
* On entry, A points to an array of size equal to or greater
* than LDA * ka * sizeof( double[2] ), where ka is n when
* TRANS = AtlasNotrans or TRANS = AtlasConj, and m otherwise.
* Before entry, the leading ( kl + ku + 1 ) by ka part of the
* array A must contain the matrix of coefficients, supplied
* column by column, with the leading diagonal of the matrix in
* row ku of the array, the first super-diagonal starting at po-
* sition 1 in row ku-1, the first sub-diagonal starting at po-
* sition 0 in row ku+1, and so on. Elements in the array A that
* do not correspond to elements in the band matrix (such as the
* top left ku by ku triangle) are not referenced. Unchanged on
* exit.
*
* The following program segment will transfer a real band ma-
* trix from conventional full matrix storage to band storage:
*
* for( j = 0; j < n; j++ )
* {
* k = ku - j; i1 = ( m > j + kl + 1 ? j + kl + 1 : m );
* for( i = ( k < 0 ? -k : 0 ); i < i1; i++ )
* {
* a[((k+i+j*LDA)<<1)+0] = real( matrix( i, j ) );
* a[((k+i+j*LDA)<<1)+1] = imag( matrix( i, j ) );
* }
* }
*
* LDA (input) const int
* On entry, LDA specifies the leading dimension of A as decla-
* red in the calling (sub) program. LDA must be at least
* ( kl + ku + 1 ). Unchanged on exit.
*
* X (input) const double *
* On entry, X points to the first entry to be accessed of an
* incremented array of size equal to or greater than
* ( 1 + ( n - 1 ) * abs( INCX ) ) * sizeof( double[2] ),
* that contains the vector x. Unchanged on exit.
*
* INCX (input) const int
* On entry, INCX specifies the increment for the elements of X.
* INCX must not be zero. Unchanged on exit.
*
* BETA (input) const double *
* On entry, BETA specifies the scalar beta. When BETA is
* supplied as zero then Y need not be set on input. Unchanged
* on exit.
*
* Y (input/output) double *
* On entry, Y points to the first entry to be accessed of an
* incremented array of size equal to or greater than
* ( 1 + ( m - 1 ) * abs( INCY ) ) * sizeof( double[2] ),
* that contains the vector y. Before entry with BETA non-zero,
* the incremented array Y must contain the vector y. On exit,
* Y is overwritten by the updated vector y.
*
* INCY (input) const int
* On entry, INCY specifies the increment for the elements of Y.
* INCY must not be zero. Unchanged on exit.
*
* ---------------------------------------------------------------------
*/
/* ..
* .. Executable Statements ..
*
*/
if( ( M == 0 ) || ( N == 0 ) ||
( Mdzero( ALPHA[0], ALPHA[1] ) && Mdone( BETA[0], BETA[1] ) ) )
return;
if( Mdzero( ALPHA[0], ALPHA[1] ) )
{ Mzvscal( M, BETA, Y, INCY ); return; }
if( TRANS == AtlasNoTrans )
{
ATL_zrefgbmvN( M, N, KL, KU, ALPHA, A, LDA, X, INCX, BETA, Y, INCY );
}
else if( TRANS == AtlasConj )
{
ATL_zrefgbmvC( M, N, KL, KU, ALPHA, A, LDA, X, INCX, BETA, Y, INCY );
}
else if( TRANS == AtlasTrans )
{
ATL_zrefgbmvT( M, N, KL, KU, ALPHA, A, LDA, X, INCX, BETA, Y, INCY );
}
else
{
ATL_zrefgbmvH( M, N, KL, KU, ALPHA, A, LDA, X, INCX, BETA, Y, INCY );
}
/*
* End of ATL_zrefgbmv
*/
}
void ATL_zrefgemv
(
const enum ATLAS_TRANS TRANS,
const int M,
const int N,
const double * ALPHA,
const double * A,
const int LDA,
const double * X,
const int INCX,
const double * BETA,
double * Y,
const int INCY
)
{
/*
* Purpose
* =======
*
* ATL_zrefgemv performs one of the matrix-vector operations
*
* y := alpha * op( A ) * x + beta * y,
*
* where op( X ) is one of
*
* op( X ) = X or op( X ) = conjg( X ) or
*
* op( X ) = X' or op( X ) = conjg( X' ).
*
* where alpha and beta are scalars, x and y are vectors and op( A ) is
* an m by n matrix.
*
* Arguments
* =========
*
* TRANS (input) const enum ATLAS_TRANS
* On entry, TRANS specifies the operation to be performed as
* follows:
*
* TRANS = AtlasNoTrans y := alpha*A *x + beta*y,
*
* TRANS = AtlasConj y := alpha*conjg( A )*x + beta*y,
*
* TRANS = AtlasTrans y := alpha*A'*x + beta*y,
*
* TRANS = AtlasConjTrans y := alpha*conjg( A' )*x + beta*y.
*
* Unchanged on exit.
*
* M (input) const int
* On entry, M specifies the number of rows of the matrix A
* when TRANS = AtlasNoTrans or TRANS = AtlasConj, and the num-
* ber of columns of the matrix A otherwise. M must be at least
* zero. Unchanged on exit.
*
* N (input) const int
* On entry, N specifies the number of columns of the matrix A
* when TRANS = AtlasNoTrans or TRANS = AtlasConj, and the num-
* ber of rows of the matrix A otherwise. N must be at least ze-
* ro. Unchanged on exit.
*
* ALPHA (input) const double *
* On entry, ALPHA specifies the scalar alpha. When ALPHA is
* supplied as zero then A and X need not be set on input. Un-
* changed on exit.
*
* A (input) const double *
* On entry, A points to an array of size equal to or greater
* than LDA * ka * sizeof( double[2] ), where ka is n when
* TRANS = AtlasNotrans or TRANS = AtlasConj, and m otherwise.
* Before entry, when TRANS = AtlasNotrans or TRANS = AtlasConj,
* the leading m by n part of the array A must contain the ma-
* trix coefficients, and otherwise the leading n by m part of
* the array A must contain the matrix coefficients. Unchanged
* on exit.
*
* LDA (input) const int
* On entry, LDA specifies the leading dimension of A as decla-
* red in the calling (sub) program. LDA must be at least
* MAX( 1, m ) when TRANS = AtlasNotrans or TRANS = AtlasConj,
* and MAX( 1, n ) otherwise. Unchanged on exit.
*
* X (input) const double *
* On entry, X points to the first entry to be accessed of an
* incremented array of size equal to or greater than
* ( 1 + ( n - 1 ) * abs( INCX ) ) * sizeof( double[2] ),
* that contains the vector x. Unchanged on exit.
*
* INCX (input) const int
* On entry, INCX specifies the increment for the elements of X.
* INCX must not be zero. Unchanged on exit.
*
* BETA (input) const double *
* On entry, BETA specifies the scalar beta. When BETA is
* supplied as zero then Y need not be set on input. Unchanged
* on exit.
*
* Y (input/output) double *
* On entry, Y points to the first entry to be accessed of an
* incremented array of size equal to or greater than
* ( 1 + ( m - 1 ) * abs( INCY ) ) * sizeof( double[2] ),
* that contains the vector y. Before entry with BETA non-zero,
* the incremented array Y must contain the vector y. On exit,
* Y is overwritten by the updated vector y.
*
* INCY (input) const int
* On entry, INCY specifies the increment for the elements of Y.
* INCY must not be zero. Unchanged on exit.
*
* ---------------------------------------------------------------------
*/
/* ..
* .. Executable Statements ..
*
*/
if( ( M == 0 ) || ( N == 0 ) ||
( Mdzero( ALPHA[0], ALPHA[1] ) && Mdone( BETA[0], BETA[1] ) ) )
return;
if( Mdzero( ALPHA[0], ALPHA[1] ) )
{ Mzvscal( M, BETA, Y, INCY ); return; }
if( TRANS == AtlasNoTrans )
{ ATL_zrefgemvN( M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); }
else if( TRANS == AtlasConj )
{ ATL_zrefgemvC( M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); }
else if( TRANS == AtlasTrans )
{ ATL_zrefgemvT( M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); }
else
{ ATL_zrefgemvH( M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); }
/*
* End of ATL_zrefgemv
*/
}
void ATL_zrefhbmvU
(
const int N,
const int K,
const double * ALPHA,
const double * A,
const int LDA,
const double * X,
const int INCX,
const double * BETA,
double * Y,
const int INCY
)
{
/*
* Purpose
* =======
*
* ATL_zrefhbmvU( ... )
*
* <=>
*
* ATL_zrefhbmv( AtlasUpper, ... )
*
* See ATL_zrefhbmv for details.
*
* ---------------------------------------------------------------------
*/
/*
* .. Local Variables ..
*/
register double t0_i, t0_r, t1_i, t1_r;
int i, i0, iaij, ix, iy, j, jaj, jx, jy, kx = 0,
ky = 0, l, incx2 = 2 * INCX, incy2 = 2 * INCY,
lda2 = ( LDA << 1 );
/* ..
* .. Executable Statements ..
*
*/
Mzvscal( N, BETA, Y, INCY );
for( j = 0, jaj = 0, jx = kx, jy = ky;
j < N; j++, jaj += lda2, jx += incx2, jy += incy2 )
{
Mmul( ALPHA[0], ALPHA[1], X[jx], X[jx+1], t0_r, t0_i );
Mset( ATL_dZERO, ATL_dZERO, t1_r, t1_i );
l = K - j; i0 = ( j - K > 0 ? j - K : 0 );
for( i = i0, iaij = ((l+i0) << 1)+jaj, ix = kx, iy = ky;
i < j; i++, iaij += 2, ix += incx2, iy += incy2 )
{
Mmla( A[iaij], A[iaij+1], t0_r, t0_i, Y[iy], Y[iy+1] );
Mmla( A[iaij], -A[iaij+1], X[ix], X[ix+1], t1_r, t1_i );
}
Mset( Y[jy] + A[iaij]*t0_r, Y[jy+1] + A[iaij]*t0_i, Y[jy], Y[jy+1] );
Mmla( ALPHA[0], ALPHA[1], t1_r, t1_i, Y[jy], Y[jy+1] );
if( j >= K ) { kx += incx2; ky += incy2; }
}
/*
* End of ATL_zrefhbmvU
*/
}
void ATL_zrefhbmv
(
const enum ATLAS_UPLO UPLO,
const int N,
const int K,
const double * ALPHA,
const double * A,
const int LDA,
const double * X,
const int INCX,
const double * BETA,
double * Y,
const int INCY
)
{
/*
* Purpose
* =======
*
* ATL_zrefhbmv performs the matrix-vector operation
*
* y := alpha * A * x + beta * y,
*
* where alpha and beta are scalars, x and y are n-element vectors and A
* is an n by n Hermitian band matrix, with k super-diagonals.
*
* Arguments
* =========
*
* UPLO (input) const enum ATLAS_UPLO
* On entry, UPLO specifies whether the upper or lower triangu-
* lar part of the band matrix A is being supplied as follows:
*
* UPLO = AtlasUpper The upper triangular part of A is
* being supplied.
*
* UPLO = AtlasLower The lower triangular part of A is
* being supplied.
*
* Unchanged on exit.
*
* N (input) const int
* On entry, N specifies the order of the matrix A. N must be at
* least zero. Unchanged on exit.
*
* K (input) const int
* On entry, K specifies the number of super-diagonals of the
* matrix A. K must satisfy 0 <= K. Unchanged on exit.
*
* ALPHA (input) const double *
* On entry, ALPHA specifies the scalar alpha. When ALPHA is
* supplied as zero then A and X need not be set on input. Un-
* changed on exit.
*
* A (input) const double *
* On entry, A points to an array of size equal to or greater
* than LDA * n * sizeof( double[2] ). Before entry with
* UPLO = AtlasUpper, the leading ( k + 1 ) by n part of the ar-
* ray A must contain the upper triangular band part of the
* Hermitian matrix, supplied column by column, with the leading
* diagonal of the matrix in row k of the array, the first su-
* per-diagonal starting at position 1 in row k-1, and so on.
* The top left k by k triangle of the array A is not referen-
* ced. Unchanged on exit.
* The following program segment will transfer the upper trian-
* gular part of a Hermitian band matrix from conventional full
* matrix storage to band storage:
*
* for( j = 0; j < n; j++ )
* {
* m = k - j;
* for( i = ( m < 0 ? -m : 0 ); i < j; i++ )
* {
* a[((m+i+j*LDA)<<1)+0] = real( matrix( i, j ) );
* a[((m+i+j*LDA)<<1)+1] = imag( matrix( i, j ) );
* }
* }
*
* Before entry with UPLO = AtlasLower, the leading ( k + 1 ) by
* n part of the array A must contain the lower triangular band
* part of the Hermitian matrix, supplied column by column, with
* the leading diagonal of the matrix in row 0 of the array, the
* first sub-diagonal starting at position 0 in row 1, and so
* on. The bottom right k by k triangle of the array A is not
* referenced. Unchanged on exit.
* The following program segment will transfer the lower trian-
* gular part of a Hermitian band matrix from conventional full
* matrix storage to band storage:
*
* for( j = 0; j < n; j++ )
* {
* i1 = ( n > j + k + 1 ? j + k + 1 : n );
* for( i = j; i < i1; i++ )
* {
* a[((i-j+j*LDA)<<1)+0] = real( matrix( i, j ) );
* a[((i-j+j*LDA)<<1)+1] = imag( matrix( i, j ) );
* }
* }
*
* Note that the imaginary parts of the local entries corres-
* ponding to the diagonal elements of A need not be set and as-
* sumed to be zero. Unchanged on exit.
*
* LDA (input) const int
* On entry, LDA specifies the leading dimension of A as decla-
* red in the calling (sub) program. LDA must be at least
* k + 1. Unchanged on exit.
*
* X (input) const double *
* On entry, X points to the first entry to be accessed of an
* incremented array of size equal to or greater than
* ( 1 + ( n - 1 ) * abs( INCX ) ) * sizeof( double[2] ),
* that contains the vector x. Unchanged on exit.
*
* INCX (input) const int
* On entry, INCX specifies the increment for the elements of X.
* INCX must not be zero. Unchanged on exit.
*
* BETA (input) const double *
* On entry, BETA specifies the scalar beta. When BETA is
* supplied as zero then Y need not be set on input. Unchanged
* on exit.
*
* Y (input/output) double *
* On entry, Y points to the first entry to be accessed of an
* incremented array of size equal to or greater than
* ( 1 + ( n - 1 ) * abs( INCY ) ) * sizeof( double[2] ),
* that contains the vector y. Before entry with BETA non-zero,
* the incremented array Y must contain the vector y. On exit,
* Y is overwritten by the updated vector y.
*
* INCY (input) const int
* On entry, INCY specifies the increment for the elements of Y.
* INCY must not be zero. Unchanged on exit.
*
* ---------------------------------------------------------------------
*/
/* ..
* .. Executable Statements ..
*
*/
if( ( N == 0 ) ||
( Mdzero( ALPHA[0], ALPHA[1] ) && Mdone( BETA[0], BETA[1] ) ) ) return;
if( Mdzero( ALPHA[0], ALPHA[1] ) )
{ Mzvscal( N, BETA, Y, INCY ); return; }
if( UPLO == AtlasUpper )
{
ATL_zrefhbmvU( N, K, ALPHA, A, LDA, X, INCX, BETA, Y, INCY );
}
else
{
ATL_zrefhbmvL( N, K, ALPHA, A, LDA, X, INCX, BETA, Y, INCY );
}
/*
* End of ATL_zrefhbmv
*/
}
void ATL_zrefhemv
(
const enum ATLAS_UPLO UPLO,
const int N,
const double * ALPHA,
const double * A,
const int LDA,
const double * X,
const int INCX,
const double * BETA,
double * Y,
const int INCY
)
{
/*
* Purpose
* =======
*
* ATL_zrefhemv performs the matrix-vector operation
*
* y := alpha * A * x + beta * y,
*
* where alpha and beta are scalars, x and y are n-element vectors and A
* is an n by n Hermitian matrix.
*
* Arguments
* =========
*
* UPLO (input) const enum ATLAS_UPLO
* On entry, UPLO specifies whether the upper or lower triangu-
* lar part of the array A is to be referenced as follows:
*
* UPLO = AtlasUpper Only the upper triangular part of A
* is to be referenced.
*
* UPLO = AtlasLower Only the lower triangular part of A
* is to be referenced.
*
* Unchanged on exit.
*
* N (input) const int
* On entry, N specifies the order of the matrix A. N must be at
* least zero. Unchanged on exit.
*
* ALPHA (input) const double *
* On entry, ALPHA specifies the scalar alpha. When ALPHA is
* supplied as zero then A and X need not be set on input. Un-
* changed on exit.
*
* A (input) const double *
* On entry, A points to an array of size equal to or greater
* than LDA * n * sizeof( double[2] ). Before entry with
* UPLO = AtlasUpper, the leading n by n upper triangular part
* of the array A must contain the upper triangular part of the
* Hermitian matrix and the strictly lower triangular part of
* A is not referenced. Before entry with UPLO = AtlasLower, the
* leading n by n lower triangular part of the array A must
* contain the lower triangular part of the Hermitian matrix and
* the strictly upper triangular part of A is not referenced.
* Unchanged on exit.
* Note that the imaginary parts of the local entries corres-
* ponding to the diagonal elements of A need not be set and as-
* sumed to be zero.
*
* LDA (input) const int
* On entry, LDA specifies the leading dimension of A as decla-
* red in the calling (sub) program. LDA must be at least
* MAX( 1, n ). Unchanged on exit.
*
* X (input) const double *
* On entry, X points to the first entry to be accessed of an
* incremented array of size equal to or greater than
* ( 1 + ( n - 1 ) * abs( INCX ) ) * sizeof( double[2] ),
* that contains the vector x. Unchanged on exit.
*
* INCX (input) const int
* On entry, INCX specifies the increment for the elements of X.
* INCX must not be zero. Unchanged on exit.
*
* BETA (input) const double *
* On entry, BETA specifies the scalar beta. When BETA is
* supplied as zero then Y need not be set on input. Unchanged
* on exit.
*
* Y (input/output) double *
* On entry, Y points to the first entry to be accessed of an
* incremented array of size equal to or greater than
* ( 1 + ( n - 1 ) * abs( INCY ) ) * sizeof( double[2] ),
* that contains the vector y. Before entry with BETA non-zero,
* the incremented array Y must contain the vector y. On exit,
* Y is overwritten by the updated vector y.
*
* INCY (input) const int
* On entry, INCY specifies the increment for the elements of Y.
* INCY must not be zero. Unchanged on exit.
*
* ---------------------------------------------------------------------
*/
/* ..
* .. Executable Statements ..
*
*/
if( ( N == 0 ) ||
( Mdzero( ALPHA[0], ALPHA[1] ) && Mdone( BETA[0], BETA[1] ) ) ) return;
if( Mdzero( ALPHA[0], ALPHA[1] ) )
{ Mzvscal( N, BETA, Y, INCY ); return; }
if( UPLO == AtlasUpper )
{
ATL_zrefhemvU( N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY );
}
else
{
ATL_zrefhemvL( N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY );
}
/*
* End of ATL_zrefhemv
*/
}
