Update to 2.0.0 tree from current Fremantle build

[opencv] / 3rdparty / lapack / dswap.c

diff --git a/3rdparty/lapack/dswap.c b/3rdparty/lapack/dswap.c
new file mode 100644 (file)
index 0000000..ebf46c6
--- /dev/null
+++ b/3rdparty/lapack/dswap.c
@@ -0,0 +1,101 @@
+#include "clapack.h"
+
+/* Subroutine */ int dswap_(integer *n, doublereal *dx, integer *incx, 
+       doublereal *dy, integer *incy)
+{
+    /* System generated locals */
+    integer i__1;
+
+    /* Local variables */
+    integer i__, m, ix, iy, mp1;
+    doublereal dtemp;
+
+/*     .. Scalar Arguments .. */
+/*     .. */
+/*     .. Array Arguments .. */
+/*     .. */
+
+/*  Purpose */
+/*  ======= */
+
+/*     interchanges two vectors. */
+/*     uses unrolled loops for increments equal one. */
+/*     jack dongarra, linpack, 3/11/78. */
+/*     modified 12/3/93, array(1) declarations changed to array(*) */
+
+
+/*     .. Local Scalars .. */
+/*     .. */
+/*     .. Intrinsic Functions .. */
+/*     .. */
+    /* Parameter adjustments */
+    --dy;
+    --dx;
+
+    /* Function Body */
+    if (*n <= 0) {
+       return 0;
+    }
+    if (*incx == 1 && *incy == 1) {
+       goto L20;
+    }
+
+/*       code for unequal increments or equal increments not equal */
+/*         to 1 */
+
+    ix = 1;
+    iy = 1;
+    if (*incx < 0) {
+       ix = (-(*n) + 1) * *incx + 1;
+    }
+    if (*incy < 0) {
+       iy = (-(*n) + 1) * *incy + 1;
+    }
+    i__1 = *n;
+    for (i__ = 1; i__ <= i__1; ++i__) {
+       dtemp = dx[ix];
+       dx[ix] = dy[iy];
+       dy[iy] = dtemp;
+       ix += *incx;
+       iy += *incy;
+/* L10: */
+    }
+    return 0;
+
+/*       code for both increments equal to 1 */
+
+
+/*       clean-up loop */
+
+L20:
+    m = *n % 3;
+    if (m == 0) {
+       goto L40;
+    }
+    i__1 = m;
+    for (i__ = 1; i__ <= i__1; ++i__) {
+       dtemp = dx[i__];
+       dx[i__] = dy[i__];
+       dy[i__] = dtemp;
+/* L30: */
+    }
+    if (*n < 3) {
+       return 0;
+    }
+L40:
+    mp1 = m + 1;
+    i__1 = *n;
+    for (i__ = mp1; i__ <= i__1; i__ += 3) {
+       dtemp = dx[i__];
+       dx[i__] = dy[i__];
+       dy[i__] = dtemp;
+       dtemp = dx[i__ + 1];
+       dx[i__ + 1] = dy[i__ + 1];
+       dy[i__ + 1] = dtemp;
+       dtemp = dx[i__ + 2];
+       dx[i__ + 2] = dy[i__ + 2];
+       dy[i__ + 2] = dtemp;
+/* L50: */
+    }
+    return 0;
+} /* dswap_ */