--- /dev/null
+#include "clapack.h"
+
+/* Subroutine */ int dgemm_(char *transa, char *transb, integer *m, integer *
+ n, integer *k, doublereal *alpha, doublereal *a, integer *lda,
+ doublereal *b, integer *ldb, doublereal *beta, doublereal *c__,
+ integer *ldc)
+{
+ /* System generated locals */
+ integer a_dim1, a_offset, b_dim1, b_offset, c_dim1, c_offset, i__1, i__2,
+ i__3;
+
+ /* Local variables */
+ integer i__, j, l, info;
+ logical nota, notb;
+ doublereal temp;
+ integer ncola;
+ extern logical lsame_(char *, char *);
+ integer nrowa, nrowb;
+ extern /* Subroutine */ int xerbla_(char *, integer *);
+
+/* .. Scalar Arguments .. */
+/* .. */
+/* .. Array Arguments .. */
+/* .. */
+
+/* Purpose */
+/* ======= */
+
+/* DGEMM performs one of the matrix-matrix operations */
+
+/* C := alpha*op( A )*op( B ) + beta*C, */
+
+/* where op( X ) is one of */
+
+/* op( X ) = X or op( X ) = X', */
+
+/* alpha and beta are scalars, and A, B and C are matrices, with op( A ) */
+/* an m by k matrix, op( B ) a k by n matrix and C an m by n matrix. */
+
+/* Arguments */
+/* ========== */
+
+/* TRANSA - CHARACTER*1. */
+/* On entry, TRANSA specifies the form of op( A ) to be used in */
+/* the matrix multiplication as follows: */
+
+/* TRANSA = 'N' or 'n', op( A ) = A. */
+
+/* TRANSA = 'T' or 't', op( A ) = A'. */
+
+/* TRANSA = 'C' or 'c', op( A ) = A'. */
+
+/* Unchanged on exit. */
+
+/* TRANSB - CHARACTER*1. */
+/* On entry, TRANSB specifies the form of op( B ) to be used in */
+/* the matrix multiplication as follows: */
+
+/* TRANSB = 'N' or 'n', op( B ) = B. */
+
+/* TRANSB = 'T' or 't', op( B ) = B'. */
+
+/* TRANSB = 'C' or 'c', op( B ) = B'. */
+
+/* Unchanged on exit. */
+
+/* M - INTEGER. */
+/* On entry, M specifies the number of rows of the matrix */
+/* op( A ) and of the matrix C. M must be at least zero. */
+/* Unchanged on exit. */
+
+/* N - INTEGER. */
+/* On entry, N specifies the number of columns of the matrix */
+/* op( B ) and the number of columns of the matrix C. N must be */
+/* at least zero. */
+/* Unchanged on exit. */
+
+/* K - INTEGER. */
+/* On entry, K specifies the number of columns of the matrix */
+/* op( A ) and the number of rows of the matrix op( B ). K must */
+/* be at least zero. */
+/* Unchanged on exit. */
+
+/* ALPHA - DOUBLE PRECISION. */
+/* On entry, ALPHA specifies the scalar alpha. */
+/* Unchanged on exit. */
+
+/* A - DOUBLE PRECISION array of DIMENSION ( LDA, ka ), where ka is */
+/* k when TRANSA = 'N' or 'n', and is m otherwise. */
+/* Before entry with TRANSA = 'N' or 'n', the leading m by k */
+/* part of the array A must contain the matrix A, otherwise */
+/* the leading k by m part of the array A must contain the */
+/* matrix A. */
+/* Unchanged on exit. */
+
+/* LDA - INTEGER. */
+/* On entry, LDA specifies the first dimension of A as declared */
+/* in the calling (sub) program. When TRANSA = 'N' or 'n' then */
+/* LDA must be at least max( 1, m ), otherwise LDA must be at */
+/* least max( 1, k ). */
+/* Unchanged on exit. */
+
+/* B - DOUBLE PRECISION array of DIMENSION ( LDB, kb ), where kb is */
+/* n when TRANSB = 'N' or 'n', and is k otherwise. */
+/* Before entry with TRANSB = 'N' or 'n', the leading k by n */
+/* part of the array B must contain the matrix B, otherwise */
+/* the leading n by k part of the array B must contain the */
+/* matrix B. */
+/* Unchanged on exit. */
+
+/* LDB - INTEGER. */
+/* On entry, LDB specifies the first dimension of B as declared */
+/* in the calling (sub) program. When TRANSB = 'N' or 'n' then */
+/* LDB must be at least max( 1, k ), otherwise LDB must be at */
+/* least max( 1, n ). */
+/* Unchanged on exit. */
+
+/* BETA - DOUBLE PRECISION. */
+/* On entry, BETA specifies the scalar beta. When BETA is */
+/* supplied as zero then C need not be set on input. */
+/* Unchanged on exit. */
+
+/* C - DOUBLE PRECISION array of DIMENSION ( LDC, n ). */
+/* Before entry, the leading m by n part of the array C must */
+/* contain the matrix C, except when beta is zero, in which */
+/* case C need not be set on entry. */
+/* On exit, the array C is overwritten by the m by n matrix */
+/* ( alpha*op( A )*op( B ) + beta*C ). */
+
+/* LDC - INTEGER. */
+/* On entry, LDC specifies the first dimension of C as declared */
+/* in the calling (sub) program. LDC must be at least */
+/* max( 1, m ). */
+/* Unchanged on exit. */
+
+
+/* Level 3 Blas routine. */
+
+/* -- Written on 8-February-1989. */
+/* Jack Dongarra, Argonne National Laboratory. */
+/* Iain Duff, AERE Harwell. */
+/* Jeremy Du Croz, Numerical Algorithms Group Ltd. */
+/* Sven Hammarling, Numerical Algorithms Group Ltd. */
+
+
+/* .. External Functions .. */
+/* .. */
+/* .. External Subroutines .. */
+/* .. */
+/* .. Intrinsic Functions .. */
+/* .. */
+/* .. Local Scalars .. */
+/* .. */
+/* .. Parameters .. */
+/* .. */
+
+/* Set NOTA and NOTB as true if A and B respectively are not */
+/* transposed and set NROWA, NCOLA and NROWB as the number of rows */
+/* and columns of A and the number of rows of B respectively. */
+
+ /* 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;
+
+ /* Function Body */
+ nota = lsame_(transa, "N");
+ notb = lsame_(transb, "N");
+ if (nota) {
+ nrowa = *m;
+ ncola = *k;
+ } else {
+ nrowa = *k;
+ ncola = *m;
+ }
+ if (notb) {
+ nrowb = *k;
+ } else {
+ nrowb = *n;
+ }
+
+/* Test the input parameters. */
+
+ info = 0;
+ if (! nota && ! lsame_(transa, "C") && ! lsame_(
+ transa, "T")) {
+ info = 1;
+ } else if (! notb && ! lsame_(transb, "C") && !
+ lsame_(transb, "T")) {
+ info = 2;
+ } else if (*m < 0) {
+ info = 3;
+ } else if (*n < 0) {
+ info = 4;
+ } else if (*k < 0) {
+ info = 5;
+ } else if (*lda < max(1,nrowa)) {
+ info = 8;
+ } else if (*ldb < max(1,nrowb)) {
+ info = 10;
+ } else if (*ldc < max(1,*m)) {
+ info = 13;
+ }
+ if (info != 0) {
+ xerbla_("DGEMM ", &info);
+ return 0;
+ }
+
+/* Quick return if possible. */
+
+ if (*m == 0 || *n == 0 || (*alpha == 0. || *k == 0) && *beta == 1.) {
+ return 0;
+ }
+
+/* And if alpha.eq.zero. */
+
+ if (*alpha == 0.) {
+ if (*beta == 0.) {
+ i__1 = *n;
+ for (j = 1; j <= i__1; ++j) {
+ i__2 = *m;
+ for (i__ = 1; i__ <= i__2; ++i__) {
+ c__[i__ + j * c_dim1] = 0.;
+/* L10: */
+ }
+/* L20: */
+ }
+ } else {
+ i__1 = *n;
+ for (j = 1; j <= i__1; ++j) {
+ i__2 = *m;
+ for (i__ = 1; i__ <= i__2; ++i__) {
+ c__[i__ + j * c_dim1] = *beta * c__[i__ + j * c_dim1];
+/* L30: */
+ }
+/* L40: */
+ }
+ }
+ return 0;
+ }
+
+/* Start the operations. */
+
+ if (notb) {
+ if (nota) {
+
+/* Form C := alpha*A*B + beta*C. */
+
+ i__1 = *n;
+ for (j = 1; j <= i__1; ++j) {
+ if (*beta == 0.) {
+ i__2 = *m;
+ for (i__ = 1; i__ <= i__2; ++i__) {
+ c__[i__ + j * c_dim1] = 0.;
+/* L50: */
+ }
+ } else if (*beta != 1.) {
+ i__2 = *m;
+ for (i__ = 1; i__ <= i__2; ++i__) {
+ c__[i__ + j * c_dim1] = *beta * c__[i__ + j * c_dim1];
+/* L60: */
+ }
+ }
+ i__2 = *k;
+ for (l = 1; l <= i__2; ++l) {
+ if (b[l + j * b_dim1] != 0.) {
+ temp = *alpha * b[l + j * b_dim1];
+ i__3 = *m;
+ for (i__ = 1; i__ <= i__3; ++i__) {
+ c__[i__ + j * c_dim1] += temp * a[i__ + l *
+ a_dim1];
+/* L70: */
+ }
+ }
+/* L80: */
+ }
+/* L90: */
+ }
+ } else {
+
+/* Form C := alpha*A'*B + beta*C */
+
+ i__1 = *n;
+ for (j = 1; j <= i__1; ++j) {
+ i__2 = *m;
+ for (i__ = 1; i__ <= i__2; ++i__) {
+ temp = 0.;
+ i__3 = *k;
+ for (l = 1; l <= i__3; ++l) {
+ temp += a[l + i__ * a_dim1] * b[l + j * b_dim1];
+/* L100: */
+ }
+ if (*beta == 0.) {
+ c__[i__ + j * c_dim1] = *alpha * temp;
+ } else {
+ c__[i__ + j * c_dim1] = *alpha * temp + *beta * c__[
+ i__ + j * c_dim1];
+ }
+/* L110: */
+ }
+/* L120: */
+ }
+ }
+ } else {
+ if (nota) {
+
+/* Form C := alpha*A*B' + beta*C */
+
+ i__1 = *n;
+ for (j = 1; j <= i__1; ++j) {
+ if (*beta == 0.) {
+ i__2 = *m;
+ for (i__ = 1; i__ <= i__2; ++i__) {
+ c__[i__ + j * c_dim1] = 0.;
+/* L130: */
+ }
+ } else if (*beta != 1.) {
+ i__2 = *m;
+ for (i__ = 1; i__ <= i__2; ++i__) {
+ c__[i__ + j * c_dim1] = *beta * c__[i__ + j * c_dim1];
+/* L140: */
+ }
+ }
+ i__2 = *k;
+ for (l = 1; l <= i__2; ++l) {
+ if (b[j + l * b_dim1] != 0.) {
+ temp = *alpha * b[j + l * b_dim1];
+ i__3 = *m;
+ for (i__ = 1; i__ <= i__3; ++i__) {
+ c__[i__ + j * c_dim1] += temp * a[i__ + l *
+ a_dim1];
+/* L150: */
+ }
+ }
+/* L160: */
+ }
+/* L170: */
+ }
+ } else {
+
+/* Form C := alpha*A'*B' + beta*C */
+
+ i__1 = *n;
+ for (j = 1; j <= i__1; ++j) {
+ i__2 = *m;
+ for (i__ = 1; i__ <= i__2; ++i__) {
+ temp = 0.;
+ i__3 = *k;
+ for (l = 1; l <= i__3; ++l) {
+ temp += a[l + i__ * a_dim1] * b[j + l * b_dim1];
+/* L180: */
+ }
+ if (*beta == 0.) {
+ c__[i__ + j * c_dim1] = *alpha * temp;
+ } else {
+ c__[i__ + j * c_dim1] = *alpha * temp + *beta * c__[
+ i__ + j * c_dim1];
+ }
+/* L190: */
+ }
+/* L200: */
+ }
+ }
+ }
+
+ return 0;
+
+/* End of DGEMM . */
+
+} /* dgemm_ */
projects / opencv / blobdiff