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/* blas/sgemv.f -- translated by f2c (version 20050501).
You must link the resulting object file with libf2c:
on Microsoft Windows system, link with libf2c.lib;
on Linux or Unix systems, link with .../path/to/libf2c.a -lm
or, if you install libf2c.a in a standard place, with -lf2c -lm
-- in that order, at the end of the command line, as in
cc *.o -lf2c -lm
Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
http://www.netlib.org/f2c/libf2c.zip
*/
#ifdef __cplusplus
extern "C" {
#endif
#include "v3p_netlib.h"
/*< >*/
/* Subroutine */ int sgemv_(char *trans, integer *m, integer *n, real *alpha,
real *a, integer *lda, real *x, integer *incx, real *beta, real *y,
integer *incy, ftnlen trans_len)
{
/* System generated locals */
integer a_dim1, a_offset, i__1, i__2;
/* Local variables */
integer i__, j, ix, iy, jx, jy, kx, ky, info;
real temp;
integer lenx, leny;
extern logical lsame_(const char *, const char *, ftnlen, ftnlen);
extern /* Subroutine */ int xerbla_(char *, integer *, ftnlen);
(void)trans_len;
/* .. Scalar Arguments .. */
/*< REAL ALPHA, BETA >*/
/*< INTEGER INCX, INCY, LDA, M, N >*/
/*< CHARACTER*1 TRANS >*/
/* .. Array Arguments .. */
/*< REAL A( LDA, * ), X( * ), Y( * ) >*/
/* .. */
/* Purpose */
/* ======= */
/* SGEMV performs one of the matrix-vector operations */
/* y := alpha*A*x + beta*y, or y := alpha*A'*x + beta*y, */
/* where alpha and beta are scalars, x and y are vectors and A is an */
/* m by n matrix. */
/* Parameters */
/* ========== */
/* TRANS - CHARACTER*1. */
/* On entry, TRANS specifies the operation to be performed as */
/* follows: */
/* TRANS = 'N' or 'n' y := alpha*A*x + beta*y. */
/* TRANS = 'T' or 't' y := alpha*A'*x + beta*y. */
/* TRANS = 'C' or 'c' y := alpha*A'*x + beta*y. */
/* Unchanged on exit. */
/* M - INTEGER. */
/* On entry, M specifies the number of rows of the matrix A. */
/* M must be at least zero. */
/* Unchanged on exit. */
/* N - INTEGER. */
/* On entry, N specifies the number of columns of the matrix A. */
/* N must be at least zero. */
/* Unchanged on exit. */
/* ALPHA - REAL . */
/* On entry, ALPHA specifies the scalar alpha. */
/* Unchanged on exit. */
/* A - REAL array of DIMENSION ( LDA, n ). */
/* Before entry, the leading m by n part of the array A must */
/* contain the matrix of coefficients. */
/* 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 */
/* max( 1, m ). */
/* Unchanged on exit. */
/* X - REAL array of DIMENSION at least */
/* ( 1 + ( n - 1 )*abs( INCX ) ) when TRANS = 'N' or 'n' */
/* and at least */
/* ( 1 + ( m - 1 )*abs( INCX ) ) otherwise. */
/* 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 - REAL . */
/* 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 - REAL array of DIMENSION at least */
/* ( 1 + ( m - 1 )*abs( INCY ) ) when TRANS = 'N' or 'n' */
/* and at least */
/* ( 1 + ( n - 1 )*abs( INCY ) ) otherwise. */
/* 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 - 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 .. */
/*< REAL ONE , ZERO >*/
/*< PARAMETER ( ONE = 1.0E+0, ZERO = 0.0E+0 ) >*/
/* .. Local Scalars .. */
/*< REAL TEMP >*/
/*< INTEGER I, INFO, IX, IY, J, JX, JY, KX, KY, LENX, LENY >*/
/* .. External Functions .. */
/*< LOGICAL LSAME >*/
/*< EXTERNAL LSAME >*/
/* .. External Subroutines .. */
/*< EXTERNAL XERBLA >*/
/* .. Intrinsic Functions .. */
/*< INTRINSIC MAX >*/
/* .. */
/* .. Executable Statements .. */
/* Test the input parameters. */
/*< INFO = 0 >*/
/* Parameter adjustments */
a_dim1 = *lda;
a_offset = 1 + a_dim1;
a -= a_offset;
--x;
--y;
/* Function Body */
info = 0;
/*< >*/
if (! lsame_(trans, "N", (ftnlen)1, (ftnlen)1) && ! lsame_(trans, "T", (
ftnlen)1, (ftnlen)1) && ! lsame_(trans, "C", (ftnlen)1, (ftnlen)1)
) {
/*< INFO = 1 >*/
info = 1;
/*< ELSE IF( M.LT.0 )THEN >*/
} else if (*m < 0) {
/*< INFO = 2 >*/
info = 2;
/*< ELSE IF( N.LT.0 )THEN >*/
} else if (*n < 0) {
/*< INFO = 3 >*/
info = 3;
/*< ELSE IF( LDA.LT.MAX( 1, M ) )THEN >*/
} else if (*lda < max(1,*m)) {
/*< INFO = 6 >*/
info = 6;
/*< ELSE IF( INCX.EQ.0 )THEN >*/
} else if (*incx == 0) {
/*< INFO = 8 >*/
info = 8;
/*< ELSE IF( INCY.EQ.0 )THEN >*/
} else if (*incy == 0) {
/*< INFO = 11 >*/
info = 11;
/*< END IF >*/
}
/*< IF( INFO.NE.0 )THEN >*/
if (info != 0) {
/*< CALL XERBLA( 'SGEMV ', INFO ) >*/
xerbla_("SGEMV ", &info, (ftnlen)6);
/*< RETURN >*/
return 0;
/*< END IF >*/
}
/* Quick return if possible. */
/*< >*/
if (*m == 0 || *n == 0 || (*alpha == (float)0. && *beta == (float)1.)) {
return 0;
}
/* Set LENX and LENY, the lengths of the vectors x and y, and set */
/* up the start points in X and Y. */
/*< IF( LSAME( TRANS, 'N' ) )THEN >*/
if (lsame_(trans, "N", (ftnlen)1, (ftnlen)1)) {
/*< LENX = N >*/
lenx = *n;
/*< LENY = M >*/
leny = *m;
/*< ELSE >*/
} else {
/*< LENX = M >*/
lenx = *m;
/*< LENY = N >*/
leny = *n;
/*< END IF >*/
}
/*< IF( INCX.GT.0 )THEN >*/
if (*incx > 0) {
/*< KX = 1 >*/
kx = 1;
/*< ELSE >*/
} else {
/*< KX = 1 - ( LENX - 1 )*INCX >*/
kx = 1 - (lenx - 1) * *incx;
/*< END IF >*/
}
/*< IF( INCY.GT.0 )THEN >*/
if (*incy > 0) {
/*< KY = 1 >*/
ky = 1;
/*< ELSE >*/
} else {
/*< KY = 1 - ( LENY - 1 )*INCY >*/
ky = 1 - (leny - 1) * *incy;
/*< END IF >*/
}
/* Start the operations. In this version the elements of A are */
/* accessed sequentially with one pass through A. */
/* First form y := beta*y. */
/*< IF( BETA.NE.ONE )THEN >*/
if (*beta != (float)1.) {
/*< IF( INCY.EQ.1 )THEN >*/
if (*incy == 1) {
/*< IF( BETA.EQ.ZERO )THEN >*/
if (*beta == (float)0.) {
/*< DO 10, I = 1, LENY >*/
i__1 = leny;
for (i__ = 1; i__ <= i__1; ++i__) {
/*< Y( I ) = ZERO >*/
y[i__] = (float)0.;
/*< 10 CONTINUE >*/
/* L10: */
}
/*< ELSE >*/
} else {
/*< DO 20, I = 1, LENY >*/
i__1 = leny;
for (i__ = 1; i__ <= i__1; ++i__) {
/*< Y( I ) = BETA*Y( I ) >*/
y[i__] = *beta * y[i__];
/*< 20 CONTINUE >*/
/* L20: */
}
/*< END IF >*/
}
/*< ELSE >*/
} else {
/*< IY = KY >*/
iy = ky;
/*< IF( BETA.EQ.ZERO )THEN >*/
if (*beta == (float)0.) {
/*< DO 30, I = 1, LENY >*/
i__1 = leny;
for (i__ = 1; i__ <= i__1; ++i__) {
/*< Y( IY ) = ZERO >*/
y[iy] = (float)0.;
/*< IY = IY + INCY >*/
iy += *incy;
/*< 30 CONTINUE >*/
/* L30: */
}
/*< ELSE >*/
} else {
/*< DO 40, I = 1, LENY >*/
i__1 = leny;
for (i__ = 1; i__ <= i__1; ++i__) {
/*< Y( IY ) = BETA*Y( IY ) >*/
y[iy] = *beta * y[iy];
/*< IY = IY + INCY >*/
iy += *incy;
/*< 40 CONTINUE >*/
/* L40: */
}
/*< END IF >*/
}
/*< END IF >*/
}
/*< END IF >*/
}
/*< >*/
if (*alpha == (float)0.) {
return 0;
}
/*< IF( LSAME( TRANS, 'N' ) )THEN >*/
if (lsame_(trans, "N", (ftnlen)1, (ftnlen)1)) {
/* Form y := alpha*A*x + y. */
/*< JX = KX >*/
jx = kx;
/*< IF( INCY.EQ.1 )THEN >*/
if (*incy == 1) {
/*< DO 60, J = 1, N >*/
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
/*< IF( X( JX ).NE.ZERO )THEN >*/
if (x[jx] != (float)0.) {
/*< TEMP = ALPHA*X( JX ) >*/
temp = *alpha * x[jx];
/*< DO 50, I = 1, M >*/
i__2 = *m;
for (i__ = 1; i__ <= i__2; ++i__) {
/*< Y( I ) = Y( I ) + TEMP*A( I, J ) >*/
y[i__] += temp * a[i__ + j * a_dim1];
/*< 50 CONTINUE >*/
/* L50: */
}
/*< END IF >*/
}
/*< JX = JX + INCX >*/
jx += *incx;
/*< 60 CONTINUE >*/
/* L60: */
}
/*< ELSE >*/
} else {
/*< DO 80, J = 1, N >*/
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
/*< IF( X( JX ).NE.ZERO )THEN >*/
if (x[jx] != (float)0.) {
/*< TEMP = ALPHA*X( JX ) >*/
temp = *alpha * x[jx];
/*< IY = KY >*/
iy = ky;
/*< DO 70, I = 1, M >*/
i__2 = *m;
for (i__ = 1; i__ <= i__2; ++i__) {
/*< Y( IY ) = Y( IY ) + TEMP*A( I, J ) >*/
y[iy] += temp * a[i__ + j * a_dim1];
/*< IY = IY + INCY >*/
iy += *incy;
/*< 70 CONTINUE >*/
/* L70: */
}
/*< END IF >*/
}
/*< JX = JX + INCX >*/
jx += *incx;
/*< 80 CONTINUE >*/
/* L80: */
}
/*< END IF >*/
}
/*< ELSE >*/
} else {
/* Form y := alpha*A'*x + y. */
/*< JY = KY >*/
jy = ky;
/*< IF( INCX.EQ.1 )THEN >*/
if (*incx == 1) {
/*< DO 100, J = 1, N >*/
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
/*< TEMP = ZERO >*/
temp = (float)0.;
/*< DO 90, I = 1, M >*/
i__2 = *m;
for (i__ = 1; i__ <= i__2; ++i__) {
/*< TEMP = TEMP + A( I, J )*X( I ) >*/
temp += a[i__ + j * a_dim1] * x[i__];
/*< 90 CONTINUE >*/
/* L90: */
}
/*< Y( JY ) = Y( JY ) + ALPHA*TEMP >*/
y[jy] += *alpha * temp;
/*< JY = JY + INCY >*/
jy += *incy;
/*< 100 CONTINUE >*/
/* L100: */
}
/*< ELSE >*/
} else {
/*< DO 120, J = 1, N >*/
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
/*< TEMP = ZERO >*/
temp = (float)0.;
/*< IX = KX >*/
ix = kx;
/*< DO 110, I = 1, M >*/
i__2 = *m;
for (i__ = 1; i__ <= i__2; ++i__) {
/*< TEMP = TEMP + A( I, J )*X( IX ) >*/
temp += a[i__ + j * a_dim1] * x[ix];
/*< IX = IX + INCX >*/
ix += *incx;
/*< 110 CONTINUE >*/
/* L110: */
}
/*< Y( JY ) = Y( JY ) + ALPHA*TEMP >*/
y[jy] += *alpha * temp;
/*< JY = JY + INCY >*/
jy += *incy;
/*< 120 CONTINUE >*/
/* L120: */
}
/*< END IF >*/
}
/*< END IF >*/
}
/*< RETURN >*/
return 0;
/* End of SGEMV . */
/*< END >*/
} /* sgemv_ */
#ifdef __cplusplus
}
#endif
|
