/* Subroutine */ int PASTEF77(z,hbmv)(character *uplo, integer *n, integer *k, doublecomplex *alpha, doublecomplex *a, integer *lda, doublecomplex *x, integer * incx, doublecomplex *beta, doublecomplex *y, integer *incy)
{
/* System generated locals */
integer a_dim1, a_offset, i__1, i__2, i__3, i__4, i__5;
doublereal d__1;
doublecomplex z__1, z__2, z__3, z__4;
/* Builtin functions */
void bla_d_cnjg(doublecomplex *, doublecomplex *);
/* Local variables */
integer info;
doublecomplex temp1, temp2;
integer i__, j, l;
extern logical PASTEF770(lsame)(character *, character *, ftnlen, ftnlen);
integer kplus1, ix, iy, jx, jy, kx, ky;
extern /* Subroutine */ int PASTEF770(xerbla)(character *, integer *, ftnlen);
/* .. Scalar Arguments .. */
/* .. Array Arguments .. */
/* .. */
/* Purpose */
/* ======= */
/* ZHBMV 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. */
/* Parameters */
/* ========== */
/* UPLO - CHARACTER*1. */
/* On entry, UPLO specifies whether the upper or lower */
/* triangular part of the band matrix A is being supplied as */
/* follows: */
/* UPLO = 'U' or 'u' The upper triangular part of A is */
/* being supplied. */
/* UPLO = 'L' or 'l' The lower triangular part of A is */
/* being supplied. */
/* Unchanged on exit. */
/* N - INTEGER. */
/* On entry, N specifies the order of the matrix A. */
/* N must be at least zero. */
/* Unchanged on exit. */
/* K - INTEGER. */
/* On entry, K specifies the number of super-diagonals of the */
/* matrix A. K must satisfy 0 .le. K. */
/* Unchanged on exit. */
/* ALPHA - COMPLEX*16 . */
/* On entry, ALPHA specifies the scalar alpha. */
/* Unchanged on exit. */
/* A - COMPLEX*16 array of DIMENSION ( LDA, n ). */
/* Before entry with UPLO = 'U' or 'u', the leading ( k + 1 ) */
/* by n part of the array 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 + 1 ) of the array, the first super-diagonal starting at */
/* position 2 in row k, and so on. The top left k by k triangle */
/* of the array A is not referenced. */
/* The following program segment will transfer the upper */
/* triangular part of a hermitian band matrix from conventional */
/* full matrix storage to band storage: */
/* DO 20, J = 1, N */
/* M = K + 1 - J */
/* DO 10, I = MAX( 1, J - K ), J */
/* A( M + I, J ) = matrix( I, J ) */
/* 10 CONTINUE */
/* 20 CONTINUE */
/* Before entry with UPLO = 'L' or 'l', 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 1 of */
/* the array, the first sub-diagonal starting at position 1 in */
/* row 2, and so on. The bottom right k by k triangle of the */
/* array A is not referenced. */
/* The following program segment will transfer the lower */
/* triangular part of a hermitian band matrix from conventional */
/* full matrix storage to band storage: */
/* DO 20, J = 1, N */
/* M = 1 - J */
/* DO 10, I = J, MIN( N, J + K ) */
/* A( M + I, J ) = matrix( I, J ) */
/* 10 CONTINUE */
/* 20 CONTINUE */
/* Note that the imaginary parts of the diagonal elements need */
/* not be set and are assumed to be zero. */
/* Unchanged on exit. */
/* LDA - INTEGER. */
/* On entry, LDA specifies the first dimension of A as declared */
/* in the calling (sub) program. LDA must be at least */
/* ( k + 1 ). */
/* Unchanged on exit. */
/* X - COMPLEX*16 array of DIMENSION at least */
/* ( 1 + ( n - 1 )*abs( INCX ) ). */
/* Before entry, the incremented array X must contain the */
/* vector x. */
/* Unchanged on exit. */
/* INCX - INTEGER. */
/* On entry, INCX specifies the increment for the elements of */
/* X. INCX must not be zero. */
/* Unchanged on exit. */
/* BETA - COMPLEX*16 . */
/* On entry, BETA specifies the scalar beta. */
/* Unchanged on exit. */
/* Y - COMPLEX*16 array of DIMENSION at least */
/* ( 1 + ( n - 1 )*abs( INCY ) ). */
/* Before entry, the incremented array Y must contain the */
/* vector y. On exit, Y is overwritten by the updated vector y. */
/* INCY - INTEGER. */
/* On entry, INCY specifies the increment for the elements of */
/* Y. INCY must not be zero. */
/* Unchanged on exit. */
/* Level 2 Blas routine. */
/* -- Written on 22-October-1986. */
/* Jack Dongarra, Argonne National Lab. */
/* Jeremy Du Croz, Nag Central Office. */
/* Sven Hammarling, Nag Central Office. */
/* Richard Hanson, Sandia National Labs. */
/* .. Parameters .. */
/* .. Local Scalars .. */
/* .. External Functions .. */
/* .. External Subroutines .. */
/* .. Intrinsic Functions .. */
/* .. */
/* .. Executable Statements .. */
/* Test the input parameters. */
/* Parameter adjustments */
a_dim1 = *lda;
a_offset = 1 + a_dim1 * 1;
a -= a_offset;
--x;
--y;
/* Function Body */
info = 0;
if (! PASTEF770(lsame)(uplo, "U", (ftnlen)1, (ftnlen)1) && ! PASTEF770(lsame)(uplo, "L", (
ftnlen)1, (ftnlen)1)) {
info = 1;
} else if (*n < 0) {
info = 2;
} else if (*k < 0) {
info = 3;
} else if (*lda < *k + 1) {
info = 6;
} else if (*incx == 0) {
info = 8;
} else if (*incy == 0) {
info = 11;
}
if (info != 0) {
PASTEF770(xerbla)("ZHBMV ", &info, (ftnlen)6);
return 0;
}
/* Quick return if possible. */
if (*n == 0 || (alpha->real == 0. && alpha->imag == 0. && (beta->real == 1. &&
beta->imag == 0.))) {
return 0;
}
/* Set up the start points in X and Y. */
if (*incx > 0) {
kx = 1;
} else {
kx = 1 - (*n - 1) * *incx;
}
if (*incy > 0) {
ky = 1;
} else {
ky = 1 - (*n - 1) * *incy;
}
/* Start the operations. In this version the elements of the array A */
/* are accessed sequentially with one pass through A. */
/* First form y := beta*y. */
if (beta->real != 1. || beta->imag != 0.) {
if (*incy == 1) {
if (beta->real == 0. && beta->imag == 0.) {
i__1 = *n;
for (i__ = 1; i__ <= i__1; ++i__) {
i__2 = i__;
y[i__2].real = 0., y[i__2].imag = 0.;
/* L10: */
}
} else {
i__1 = *n;
for (i__ = 1; i__ <= i__1; ++i__) {
i__2 = i__;
i__3 = i__;
z__1.real = beta->real * y[i__3].real - beta->imag * y[i__3].imag,
z__1.imag = beta->real * y[i__3].imag + beta->imag * y[i__3]
.real;
y[i__2].real = z__1.real, y[i__2].imag = z__1.imag;
/* L20: */
}
}
} else {
iy = ky;
if (beta->real == 0. && beta->imag == 0.) {
i__1 = *n;
for (i__ = 1; i__ <= i__1; ++i__) {
i__2 = iy;
y[i__2].real = 0., y[i__2].imag = 0.;
iy += *incy;
/* L30: */
}
} else {
i__1 = *n;
for (i__ = 1; i__ <= i__1; ++i__) {
i__2 = iy;
i__3 = iy;
z__1.real = beta->real * y[i__3].real - beta->imag * y[i__3].imag,
z__1.imag = beta->real * y[i__3].imag + beta->imag * y[i__3]
.real;
y[i__2].real = z__1.real, y[i__2].imag = z__1.imag;
iy += *incy;
/* L40: */
}
}
}
}
if (alpha->real == 0. && alpha->imag == 0.) {
return 0;
}
if (PASTEF770(lsame)(uplo, "U", (ftnlen)1, (ftnlen)1)) {
/* Form y when upper triangle of A is stored. */
kplus1 = *k + 1;
if (*incx == 1 && *incy == 1) {
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
i__2 = j;
z__1.real = alpha->real * x[i__2].real - alpha->imag * x[i__2].imag, z__1.imag =
alpha->real * x[i__2].imag + alpha->imag * x[i__2].real;
temp1.real = z__1.real, temp1.imag = z__1.imag;
temp2.real = 0., temp2.imag = 0.;
l = kplus1 - j;
/* Computing MAX */
i__2 = 1, i__3 = j - *k;
i__4 = j - 1;
for (i__ = f2c_max(i__2,i__3); i__ <= i__4; ++i__) {
i__2 = i__;
i__3 = i__;
i__5 = l + i__ + j * a_dim1;
z__2.real = temp1.real * a[i__5].real - temp1.imag * a[i__5].imag,
z__2.imag = temp1.real * a[i__5].imag + temp1.imag * a[i__5]
.real;
z__1.real = y[i__3].real + z__2.real, z__1.imag = y[i__3].imag + z__2.imag;
y[i__2].real = z__1.real, y[i__2].imag = z__1.imag;
bla_d_cnjg(&z__3, &a[l + i__ + j * a_dim1]);
i__2 = i__;
z__2.real = z__3.real * x[i__2].real - z__3.imag * x[i__2].imag, z__2.imag =
z__3.real * x[i__2].imag + z__3.imag * x[i__2].real;
z__1.real = temp2.real + z__2.real, z__1.imag = temp2.imag + z__2.imag;
temp2.real = z__1.real, temp2.imag = z__1.imag;
/* L50: */
}
i__4 = j;
i__2 = j;
i__3 = kplus1 + j * a_dim1;
d__1 = a[i__3].real;
z__3.real = d__1 * temp1.real, z__3.imag = d__1 * temp1.imag;
z__2.real = y[i__2].real + z__3.real, z__2.imag = y[i__2].imag + z__3.imag;
z__4.real = alpha->real * temp2.real - alpha->imag * temp2.imag, z__4.imag =
alpha->real * temp2.imag + alpha->imag * temp2.real;
z__1.real = z__2.real + z__4.real, z__1.imag = z__2.imag + z__4.imag;
y[i__4].real = z__1.real, y[i__4].imag = z__1.imag;
/* L60: */
}
} else {
jx = kx;
jy = ky;
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
i__4 = jx;
z__1.real = alpha->real * x[i__4].real - alpha->imag * x[i__4].imag, z__1.imag =
alpha->real * x[i__4].imag + alpha->imag * x[i__4].real;
temp1.real = z__1.real, temp1.imag = z__1.imag;
temp2.real = 0., temp2.imag = 0.;
ix = kx;
iy = ky;
l = kplus1 - j;
/* Computing MAX */
i__4 = 1, i__2 = j - *k;
i__3 = j - 1;
for (i__ = f2c_max(i__4,i__2); i__ <= i__3; ++i__) {
i__4 = iy;
i__2 = iy;
i__5 = l + i__ + j * a_dim1;
z__2.real = temp1.real * a[i__5].real - temp1.imag * a[i__5].imag,
z__2.imag = temp1.real * a[i__5].imag + temp1.imag * a[i__5]
.real;
z__1.real = y[i__2].real + z__2.real, z__1.imag = y[i__2].imag + z__2.imag;
y[i__4].real = z__1.real, y[i__4].imag = z__1.imag;
bla_d_cnjg(&z__3, &a[l + i__ + j * a_dim1]);
i__4 = ix;
z__2.real = z__3.real * x[i__4].real - z__3.imag * x[i__4].imag, z__2.imag =
z__3.real * x[i__4].imag + z__3.imag * x[i__4].real;
z__1.real = temp2.real + z__2.real, z__1.imag = temp2.imag + z__2.imag;
temp2.real = z__1.real, temp2.imag = z__1.imag;
ix += *incx;
iy += *incy;
/* L70: */
}
i__3 = jy;
i__4 = jy;
i__2 = kplus1 + j * a_dim1;
d__1 = a[i__2].real;
z__3.real = d__1 * temp1.real, z__3.imag = d__1 * temp1.imag;
z__2.real = y[i__4].real + z__3.real, z__2.imag = y[i__4].imag + z__3.imag;
z__4.real = alpha->real * temp2.real - alpha->imag * temp2.imag, z__4.imag =
alpha->real * temp2.imag + alpha->imag * temp2.real;
z__1.real = z__2.real + z__4.real, z__1.imag = z__2.imag + z__4.imag;
y[i__3].real = z__1.real, y[i__3].imag = z__1.imag;
jx += *incx;
jy += *incy;
if (j > *k) {
kx += *incx;
ky += *incy;
}
/* L80: */
}
}
} else {
/* Form y when lower triangle of A is stored. */
if (*incx == 1 && *incy == 1) {
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
i__3 = j;
z__1.real = alpha->real * x[i__3].real - alpha->imag * x[i__3].imag, z__1.imag =
alpha->real * x[i__3].imag + alpha->imag * x[i__3].real;
temp1.real = z__1.real, temp1.imag = z__1.imag;
temp2.real = 0., temp2.imag = 0.;
i__3 = j;
i__4 = j;
i__2 = j * a_dim1 + 1;
d__1 = a[i__2].real;
z__2.real = d__1 * temp1.real, z__2.imag = d__1 * temp1.imag;
z__1.real = y[i__4].real + z__2.real, z__1.imag = y[i__4].imag + z__2.imag;
y[i__3].real = z__1.real, y[i__3].imag = z__1.imag;
l = 1 - j;
/* Computing MIN */
i__4 = *n, i__2 = j + *k;
i__3 = f2c_min(i__4,i__2);
for (i__ = j + 1; i__ <= i__3; ++i__) {
i__4 = i__;
i__2 = i__;
i__5 = l + i__ + j * a_dim1;
z__2.real = temp1.real * a[i__5].real - temp1.imag * a[i__5].imag,
z__2.imag = temp1.real * a[i__5].imag + temp1.imag * a[i__5]
.real;
z__1.real = y[i__2].real + z__2.real, z__1.imag = y[i__2].imag + z__2.imag;
y[i__4].real = z__1.real, y[i__4].imag = z__1.imag;
bla_d_cnjg(&z__3, &a[l + i__ + j * a_dim1]);
i__4 = i__;
z__2.real = z__3.real * x[i__4].real - z__3.imag * x[i__4].imag, z__2.imag =
z__3.real * x[i__4].imag + z__3.imag * x[i__4].real;
z__1.real = temp2.real + z__2.real, z__1.imag = temp2.imag + z__2.imag;
temp2.real = z__1.real, temp2.imag = z__1.imag;
/* L90: */
}
i__3 = j;
i__4 = j;
z__2.real = alpha->real * temp2.real - alpha->imag * temp2.imag, z__2.imag =
alpha->real * temp2.imag + alpha->imag * temp2.real;
z__1.real = y[i__4].real + z__2.real, z__1.imag = y[i__4].imag + z__2.imag;
y[i__3].real = z__1.real, y[i__3].imag = z__1.imag;
/* L100: */
}
} else {
jx = kx;
jy = ky;
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
i__3 = jx;
z__1.real = alpha->real * x[i__3].real - alpha->imag * x[i__3].imag, z__1.imag =
alpha->real * x[i__3].imag + alpha->imag * x[i__3].real;
temp1.real = z__1.real, temp1.imag = z__1.imag;
temp2.real = 0., temp2.imag = 0.;
i__3 = jy;
i__4 = jy;
i__2 = j * a_dim1 + 1;
d__1 = a[i__2].real;
z__2.real = d__1 * temp1.real, z__2.imag = d__1 * temp1.imag;
z__1.real = y[i__4].real + z__2.real, z__1.imag = y[i__4].imag + z__2.imag;
y[i__3].real = z__1.real, y[i__3].imag = z__1.imag;
l = 1 - j;
ix = jx;
iy = jy;
/* Computing MIN */
i__4 = *n, i__2 = j + *k;
i__3 = f2c_min(i__4,i__2);
for (i__ = j + 1; i__ <= i__3; ++i__) {
ix += *incx;
iy += *incy;
i__4 = iy;
i__2 = iy;
i__5 = l + i__ + j * a_dim1;
z__2.real = temp1.real * a[i__5].real - temp1.imag * a[i__5].imag,
z__2.imag = temp1.real * a[i__5].imag + temp1.imag * a[i__5]
.real;
z__1.real = y[i__2].real + z__2.real, z__1.imag = y[i__2].imag + z__2.imag;
y[i__4].real = z__1.real, y[i__4].imag = z__1.imag;
bla_d_cnjg(&z__3, &a[l + i__ + j * a_dim1]);
i__4 = ix;
z__2.real = z__3.real * x[i__4].real - z__3.imag * x[i__4].imag, z__2.imag =
z__3.real * x[i__4].imag + z__3.imag * x[i__4].real;
z__1.real = temp2.real + z__2.real, z__1.imag = temp2.imag + z__2.imag;
temp2.real = z__1.real, temp2.imag = z__1.imag;
/* L110: */
}
i__3 = jy;
i__4 = jy;
z__2.real = alpha->real * temp2.real - alpha->imag * temp2.imag, z__2.imag =
alpha->real * temp2.imag + alpha->imag * temp2.real;
z__1.real = y[i__4].real + z__2.real, z__1.imag = y[i__4].imag + z__2.imag;
y[i__3].real = z__1.real, y[i__3].imag = z__1.imag;
jx += *incx;
jy += *incy;
/* L120: */
}
}
}
return 0;
/* End of ZHBMV . */
} /* zhbmv_ */
/* Subroutine */ int PASTEF77(d,sbmv)(const bla_character *uplo, const bla_integer *n, const bla_integer *k, const bla_double *alpha, const bla_double *a, const bla_integer *lda, const bla_double *x, const bla_integer *incx, const bla_double *beta, bla_double *y, const bla_integer *incy)
{
/* System generated locals */
bla_integer a_dim1, a_offset, i__1, i__2, i__3, i__4;
/* Local variables */
bla_integer info;
bla_double temp1, temp2;
bla_integer i__, j, l;
//extern bla_logical PASTEF770(lsame)(bla_character *, bla_character *, ftnlen, ftnlen);
bla_integer kplus1, ix, iy, jx, jy, kx, ky;
//extern /* Subroutine */ int PASTEF770(xerbla)(bla_character *, bla_integer *, ftnlen);
/* .. Scalar Arguments .. */
/* .. Array Arguments .. */
/* .. */
/* Purpose */
/* ======= */
/* DSBMV 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 symmetric band matrix, with k super-diagonals. */
/* Parameters */
/* ========== */
/* UPLO - CHARACTER*1. */
/* On entry, UPLO specifies whether the upper or lower */
/* triangular part of the band matrix A is being supplied as */
/* follows: */
/* UPLO = 'U' or 'u' The upper triangular part of A is */
/* being supplied. */
/* UPLO = 'L' or 'l' The lower triangular part of A is */
/* being supplied. */
/* Unchanged on exit. */
/* N - INTEGER. */
/* On entry, N specifies the order of the matrix A. */
/* N must be at least zero. */
/* Unchanged on exit. */
/* K - INTEGER. */
/* On entry, K specifies the number of super-diagonals of the */
/* matrix A. K must satisfy 0 .le. K. */
/* Unchanged on exit. */
/* ALPHA - DOUBLE PRECISION. */
/* On entry, ALPHA specifies the scalar alpha. */
/* Unchanged on exit. */
/* A - DOUBLE PRECISION array of DIMENSION ( LDA, n ). */
/* Before entry with UPLO = 'U' or 'u', the leading ( k + 1 ) */
/* by n part of the array A must contain the upper triangular */
/* band part of the symmetric matrix, supplied column by */
/* column, with the leading diagonal of the matrix in row */
/* ( k + 1 ) of the array, the first super-diagonal starting at */
/* position 2 in row k, and so on. The top left k by k triangle */
/* of the array A is not referenced. */
/* The following program segment will transfer the upper */
/* triangular part of a symmetric band matrix from conventional */
/* full matrix storage to band storage: */
/* DO 20, J = 1, N */
/* M = K + 1 - J */
/* DO 10, I = MAX( 1, J - K ), J */
/* A( M + I, J ) = matrix( I, J ) */
/* 10 CONTINUE */
/* 20 CONTINUE */
/* Before entry with UPLO = 'L' or 'l', the leading ( k + 1 ) */
/* by n part of the array A must contain the lower triangular */
/* band part of the symmetric matrix, supplied column by */
/* column, with the leading diagonal of the matrix in row 1 of */
/* the array, the first sub-diagonal starting at position 1 in */
/* row 2, and so on. The bottom right k by k triangle of the */
/* array A is not referenced. */
/* The following program segment will transfer the lower */
/* triangular part of a symmetric band matrix from conventional */
/* full matrix storage to band storage: */
/* DO 20, J = 1, N */
/* M = 1 - J */
/* DO 10, I = J, MIN( N, J + K ) */
/* A( M + I, J ) = matrix( I, J ) */
/* 10 CONTINUE */
/* 20 CONTINUE */
/* Unchanged on exit. */
/* LDA - INTEGER. */
/* On entry, LDA specifies the first dimension of A as declared */
/* in the calling (sub) program. LDA must be at least */
/* ( k + 1 ). */
/* Unchanged on exit. */
/* X - DOUBLE PRECISION array of DIMENSION at least */
/* ( 1 + ( n - 1 )*abs( INCX ) ). */
/* Before entry, the incremented array X must contain the */
/* vector x. */
/* Unchanged on exit. */
/* INCX - INTEGER. */
/* On entry, INCX specifies the increment for the elements of */
/* X. INCX must not be zero. */
/* Unchanged on exit. */
/* BETA - DOUBLE PRECISION. */
/* On entry, BETA specifies the scalar beta. */
/* Unchanged on exit. */
/* Y - DOUBLE PRECISION array of DIMENSION at least */
/* ( 1 + ( n - 1 )*abs( INCY ) ). */
/* Before entry, the incremented array Y must contain the */
/* vector y. On exit, Y is overwritten by the updated vector y. */
/* INCY - INTEGER. */
/* On entry, INCY specifies the increment for the elements of */
/* Y. INCY must not be zero. */
/* Unchanged on exit. */
/* Level 2 Blas routine. */
/* -- Written on 22-October-1986. */
/* Jack Dongarra, Argonne National Lab. */
/* Jeremy Du Croz, Nag Central Office. */
/* Sven Hammarling, Nag Central Office. */
/* Richard Hanson, Sandia National Labs. */
/* .. Parameters .. */
/* .. Local Scalars .. */
/* .. External Functions .. */
/* .. External Subroutines .. */
/* .. Intrinsic Functions .. */
/* .. */
/* .. Executable Statements .. */
/* Test the input parameters. */
/* Parameter adjustments */
a_dim1 = *lda;
a_offset = 1 + a_dim1 * 1;
a -= a_offset;
--x;
--y;
/* Function Body */
info = 0;
if (! PASTEF770(lsame)(uplo, "U", (ftnlen)1, (ftnlen)1) && ! PASTEF770(lsame)(uplo, "L", (
ftnlen)1, (ftnlen)1)) {
info = 1;
} else if (*n < 0) {
info = 2;
} else if (*k < 0) {
info = 3;
} else if (*lda < *k + 1) {
info = 6;
} else if (*incx == 0) {
info = 8;
} else if (*incy == 0) {
info = 11;
}
if (info != 0) {
PASTEF770(xerbla)("DSBMV ", &info, (ftnlen)6);
return 0;
}
/* Quick return if possible. */
if (*n == 0 || (*alpha == 0. && *beta == 1.)) {
return 0;
}
/* Set up the start points in X and Y. */
if (*incx > 0) {
kx = 1;
} else {
kx = 1 - (*n - 1) * *incx;
}
if (*incy > 0) {
ky = 1;
} else {
ky = 1 - (*n - 1) * *incy;
}
/* Start the operations. In this version the elements of the array A */
/* are accessed sequentially with one pass through A. */
/* First form y := beta*y. */
if (*beta != 1.) {
if (*incy == 1) {
if (*beta == 0.) {
i__1 = *n;
for (i__ = 1; i__ <= i__1; ++i__) {
y[i__] = 0.;
/* L10: */
}
} else {
i__1 = *n;
for (i__ = 1; i__ <= i__1; ++i__) {
y[i__] = *beta * y[i__];
/* L20: */
}
}
} else {
iy = ky;
if (*beta == 0.) {
i__1 = *n;
for (i__ = 1; i__ <= i__1; ++i__) {
y[iy] = 0.;
iy += *incy;
/* L30: */
}
} else {
i__1 = *n;
for (i__ = 1; i__ <= i__1; ++i__) {
y[iy] = *beta * y[iy];
iy += *incy;
/* L40: */
}
}
}
}
if (*alpha == 0.) {
return 0;
}
if (PASTEF770(lsame)(uplo, "U", (ftnlen)1, (ftnlen)1)) {
/* Form y when upper triangle of A is stored. */
kplus1 = *k + 1;
if (*incx == 1 && *incy == 1) {
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
temp1 = *alpha * x[j];
temp2 = 0.;
l = kplus1 - j;
/* Computing MAX */
i__2 = 1, i__3 = j - *k;
i__4 = j - 1;
for (i__ = f2c_max(i__2,i__3); i__ <= i__4; ++i__) {
y[i__] += temp1 * a[l + i__ + j * a_dim1];
temp2 += a[l + i__ + j * a_dim1] * x[i__];
/* L50: */
}
y[j] = y[j] + temp1 * a[kplus1 + j * a_dim1] + *alpha * temp2;
/* L60: */
}
} else {
jx = kx;
jy = ky;
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
temp1 = *alpha * x[jx];
temp2 = 0.;
ix = kx;
iy = ky;
l = kplus1 - j;
/* Computing MAX */
i__4 = 1, i__2 = j - *k;
i__3 = j - 1;
for (i__ = f2c_max(i__4,i__2); i__ <= i__3; ++i__) {
y[iy] += temp1 * a[l + i__ + j * a_dim1];
temp2 += a[l + i__ + j * a_dim1] * x[ix];
ix += *incx;
iy += *incy;
/* L70: */
}
y[jy] = y[jy] + temp1 * a[kplus1 + j * a_dim1] + *alpha *
temp2;
jx += *incx;
jy += *incy;
if (j > *k) {
kx += *incx;
ky += *incy;
}
/* L80: */
}
}
} else {
/* Form y when lower triangle of A is stored. */
if (*incx == 1 && *incy == 1) {
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
temp1 = *alpha * x[j];
temp2 = 0.;
y[j] += temp1 * a[j * a_dim1 + 1];
l = 1 - j;
/* Computing MIN */
i__4 = *n, i__2 = j + *k;
i__3 = f2c_min(i__4,i__2);
for (i__ = j + 1; i__ <= i__3; ++i__) {
y[i__] += temp1 * a[l + i__ + j * a_dim1];
temp2 += a[l + i__ + j * a_dim1] * x[i__];
/* L90: */
}
y[j] += *alpha * temp2;
/* L100: */
}
} else {
jx = kx;
jy = ky;
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
temp1 = *alpha * x[jx];
temp2 = 0.;
y[jy] += temp1 * a[j * a_dim1 + 1];
l = 1 - j;
ix = jx;
iy = jy;
/* Computing MIN */
i__4 = *n, i__2 = j + *k;
i__3 = f2c_min(i__4,i__2);
for (i__ = j + 1; i__ <= i__3; ++i__) {
ix += *incx;
iy += *incy;
y[iy] += temp1 * a[l + i__ + j * a_dim1];
temp2 += a[l + i__ + j * a_dim1] * x[ix];
/* L110: */
}
y[jy] += *alpha * temp2;
jx += *incx;
jy += *incy;
/* L120: */
}
}
}
return 0;
/* End of DSBMV . */
} /* dsbmv_ */
