zlarcm.c

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/* zlarcm.f -- translated by f2c (version 20061008).
   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
*/

#include "f2c.h"
#include "blaswrap.h"

/* Table of constant values */

static doublereal c_b6 = 1.;
static doublereal c_b7 = 0.;

/* Subroutine */ int zlarcm_(integer *m, integer *n, doublereal *a, integer *
        lda, doublecomplex *b, integer *ldb, doublecomplex *c__, integer *ldc, 
         doublereal *rwork)
{
    /* System generated locals */
    integer a_dim1, a_offset, b_dim1, b_offset, c_dim1, c_offset, i__1, i__2, 
            i__3, i__4, i__5;
    doublereal d__1;
    doublecomplex z__1;

    /* Builtin functions */
    double d_imag(doublecomplex *);

    /* Local variables */
    integer i__, j, l;
    extern /* Subroutine */ int dgemm_(char *, char *, integer *, integer *, 
            integer *, doublereal *, doublereal *, integer *, doublereal *, 
            integer *, doublereal *, doublereal *, integer *);


/*  -- LAPACK auxiliary routine (version 3.2) -- */
/*     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
/*     November 2006 */

/*     .. Scalar Arguments .. */
/*     .. */
/*     .. Array Arguments .. */
/*     .. */

/*  Purpose */
/*  ======= */

/*  ZLARCM performs a very simple matrix-matrix multiplication: */
/*           C := A * B, */
/*  where A is M by M and real; B is M by N and complex; */
/*  C is M by N and complex. */

/*  Arguments */
/*  ========= */

/*  M       (input) INTEGER */
/*          The number of rows of the matrix A and of the matrix C. */
/*          M >= 0. */

/*  N       (input) INTEGER */
/*          The number of columns and rows of the matrix B and */
/*          the number of columns of the matrix C. */
/*          N >= 0. */

/*  A       (input) DOUBLE PRECISION array, dimension (LDA, M) */
/*          A contains the M by M matrix A. */

/*  LDA     (input) INTEGER */
/*          The leading dimension of the array A. LDA >=max(1,M). */

/*  B       (input) DOUBLE PRECISION array, dimension (LDB, N) */
/*          B contains the M by N matrix B. */

/*  LDB     (input) INTEGER */
/*          The leading dimension of the array B. LDB >=max(1,M). */

/*  C       (input) COMPLEX*16 array, dimension (LDC, N) */
/*          C contains the M by N matrix C. */

/*  LDC     (input) INTEGER */
/*          The leading dimension of the array C. LDC >=max(1,M). */

/*  RWORK   (workspace) DOUBLE PRECISION array, dimension (2*M*N) */

/*  ===================================================================== */

/*     .. Parameters .. */
/*     .. */
/*     .. Local Scalars .. */
/*     .. */
/*     .. Intrinsic Functions .. */
/*     .. */
/*     .. External Subroutines .. */
/*     .. */
/*     .. Executable Statements .. */

/*     Quick return if possible. */

    /* Parameter adjustments */
    a_dim1 = *lda;
    a_offset = 1 + a_dim1;
    a -= a_offset;
    b_dim1 = *ldb;
    b_offset = 1 + b_dim1;
    b -= b_offset;
    c_dim1 = *ldc;
    c_offset = 1 + c_dim1;
    c__ -= c_offset;
    --rwork;

    /* Function Body */
    if (*m == 0 || *n == 0) {
        return 0;
    }

    i__1 = *n;
    for (j = 1; j <= i__1; ++j) {
        i__2 = *m;
        for (i__ = 1; i__ <= i__2; ++i__) {
            i__3 = i__ + j * b_dim1;
            rwork[(j - 1) * *m + i__] = b[i__3].r;
/* L10: */
        }
/* L20: */
    }

    l = *m * *n + 1;
    dgemm_("N", "N", m, n, m, &c_b6, &a[a_offset], lda, &rwork[1], m, &c_b7, &
            rwork[l], m);
    i__1 = *n;
    for (j = 1; j <= i__1; ++j) {
        i__2 = *m;
        for (i__ = 1; i__ <= i__2; ++i__) {
            i__3 = i__ + j * c_dim1;
            i__4 = l + (j - 1) * *m + i__ - 1;
            c__[i__3].r = rwork[i__4], c__[i__3].i = 0.;
/* L30: */
        }
/* L40: */
    }

    i__1 = *n;
    for (j = 1; j <= i__1; ++j) {
        i__2 = *m;
        for (i__ = 1; i__ <= i__2; ++i__) {
            rwork[(j - 1) * *m + i__] = d_imag(&b[i__ + j * b_dim1]);
/* L50: */
        }
/* L60: */
    }
    dgemm_("N", "N", m, n, m, &c_b6, &a[a_offset], lda, &rwork[1], m, &c_b7, &
            rwork[l], m);
    i__1 = *n;
    for (j = 1; j <= i__1; ++j) {
        i__2 = *m;
        for (i__ = 1; i__ <= i__2; ++i__) {
            i__3 = i__ + j * c_dim1;
            i__4 = i__ + j * c_dim1;
            d__1 = c__[i__4].r;
            i__5 = l + (j - 1) * *m + i__ - 1;
            z__1.r = d__1, z__1.i = rwork[i__5];
            c__[i__3].r = z__1.r, c__[i__3].i = z__1.i;
/* L70: */
        }
/* L80: */
    }

    return 0;

/*     End of ZLARCM */

} /* zlarcm_ */