Squashed 'third_party/eigen/' changes from 61d72f6..cf794d3
Change-Id: I9b814151b01f49af6337a8605d0c42a3a1ed4c72
git-subtree-dir: third_party/eigen
git-subtree-split: cf794d3b741a6278df169e58461f8529f43bce5d
diff --git a/blas/f2c/drotmg.c b/blas/f2c/drotmg.c
new file mode 100644
index 0000000..a63eb10
--- /dev/null
+++ b/blas/f2c/drotmg.c
@@ -0,0 +1,293 @@
+/* drotmg.f -- translated by f2c (version 20100827).
+ 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 "datatypes.h"
+
+/* Subroutine */ int drotmg_(doublereal *dd1, doublereal *dd2, doublereal *
+ dx1, doublereal *dy1, doublereal *dparam)
+{
+ /* Initialized data */
+
+ static doublereal zero = 0.;
+ static doublereal one = 1.;
+ static doublereal two = 2.;
+ static doublereal gam = 4096.;
+ static doublereal gamsq = 16777216.;
+ static doublereal rgamsq = 5.9604645e-8;
+
+ /* Format strings */
+ static char fmt_120[] = "";
+ static char fmt_150[] = "";
+ static char fmt_180[] = "";
+ static char fmt_210[] = "";
+
+ /* System generated locals */
+ doublereal d__1;
+
+ /* Local variables */
+ doublereal du, dp1, dp2, dq1, dq2, dh11, dh12, dh21, dh22;
+ integer igo;
+ doublereal dflag, dtemp;
+
+ /* Assigned format variables */
+ static char *igo_fmt;
+
+/* .. Scalar Arguments .. */
+/* .. */
+/* .. Array Arguments .. */
+/* .. */
+
+/* Purpose */
+/* ======= */
+
+/* CONSTRUCT THE MODIFIED GIVENS TRANSFORMATION MATRIX H WHICH ZEROS */
+/* THE SECOND COMPONENT OF THE 2-VECTOR (DSQRT(DD1)*DX1,DSQRT(DD2)* */
+/* DY2)**T. */
+/* WITH DPARAM(1)=DFLAG, H HAS ONE OF THE FOLLOWING FORMS.. */
+
+/* DFLAG=-1.D0 DFLAG=0.D0 DFLAG=1.D0 DFLAG=-2.D0 */
+
+/* (DH11 DH12) (1.D0 DH12) (DH11 1.D0) (1.D0 0.D0) */
+/* H=( ) ( ) ( ) ( ) */
+/* (DH21 DH22), (DH21 1.D0), (-1.D0 DH22), (0.D0 1.D0). */
+/* LOCATIONS 2-4 OF DPARAM CONTAIN DH11, DH21, DH12, AND DH22 */
+/* RESPECTIVELY. (VALUES OF 1.D0, -1.D0, OR 0.D0 IMPLIED BY THE */
+/* VALUE OF DPARAM(1) ARE NOT STORED IN DPARAM.) */
+
+/* THE VALUES OF GAMSQ AND RGAMSQ SET IN THE DATA STATEMENT MAY BE */
+/* INEXACT. THIS IS OK AS THEY ARE ONLY USED FOR TESTING THE SIZE */
+/* OF DD1 AND DD2. ALL ACTUAL SCALING OF DATA IS DONE USING GAM. */
+
+
+/* Arguments */
+/* ========= */
+
+/* DD1 (input/output) DOUBLE PRECISION */
+
+/* DD2 (input/output) DOUBLE PRECISION */
+
+/* DX1 (input/output) DOUBLE PRECISION */
+
+/* DY1 (input) DOUBLE PRECISION */
+
+/* DPARAM (input/output) DOUBLE PRECISION array, dimension 5 */
+/* DPARAM(1)=DFLAG */
+/* DPARAM(2)=DH11 */
+/* DPARAM(3)=DH21 */
+/* DPARAM(4)=DH12 */
+/* DPARAM(5)=DH22 */
+
+/* ===================================================================== */
+
+/* .. Local Scalars .. */
+/* .. */
+/* .. Intrinsic Functions .. */
+/* .. */
+/* .. Data statements .. */
+
+ /* Parameter adjustments */
+ --dparam;
+
+ /* Function Body */
+/* .. */
+ if (! (*dd1 < zero)) {
+ goto L10;
+ }
+/* GO ZERO-H-D-AND-DX1.. */
+ goto L60;
+L10:
+/* CASE-DD1-NONNEGATIVE */
+ dp2 = *dd2 * *dy1;
+ if (! (dp2 == zero)) {
+ goto L20;
+ }
+ dflag = -two;
+ goto L260;
+/* REGULAR-CASE.. */
+L20:
+ dp1 = *dd1 * *dx1;
+ dq2 = dp2 * *dy1;
+ dq1 = dp1 * *dx1;
+
+ if (! (abs(dq1) > abs(dq2))) {
+ goto L40;
+ }
+ dh21 = -(*dy1) / *dx1;
+ dh12 = dp2 / dp1;
+
+ du = one - dh12 * dh21;
+
+ if (! (du <= zero)) {
+ goto L30;
+ }
+/* GO ZERO-H-D-AND-DX1.. */
+ goto L60;
+L30:
+ dflag = zero;
+ *dd1 /= du;
+ *dd2 /= du;
+ *dx1 *= du;
+/* GO SCALE-CHECK.. */
+ goto L100;
+L40:
+ if (! (dq2 < zero)) {
+ goto L50;
+ }
+/* GO ZERO-H-D-AND-DX1.. */
+ goto L60;
+L50:
+ dflag = one;
+ dh11 = dp1 / dp2;
+ dh22 = *dx1 / *dy1;
+ du = one + dh11 * dh22;
+ dtemp = *dd2 / du;
+ *dd2 = *dd1 / du;
+ *dd1 = dtemp;
+ *dx1 = *dy1 * du;
+/* GO SCALE-CHECK */
+ goto L100;
+/* PROCEDURE..ZERO-H-D-AND-DX1.. */
+L60:
+ dflag = -one;
+ dh11 = zero;
+ dh12 = zero;
+ dh21 = zero;
+ dh22 = zero;
+
+ *dd1 = zero;
+ *dd2 = zero;
+ *dx1 = zero;
+/* RETURN.. */
+ goto L220;
+/* PROCEDURE..FIX-H.. */
+L70:
+ if (! (dflag >= zero)) {
+ goto L90;
+ }
+
+ if (! (dflag == zero)) {
+ goto L80;
+ }
+ dh11 = one;
+ dh22 = one;
+ dflag = -one;
+ goto L90;
+L80:
+ dh21 = -one;
+ dh12 = one;
+ dflag = -one;
+L90:
+ switch (igo) {
+ case 0: goto L120;
+ case 1: goto L150;
+ case 2: goto L180;
+ case 3: goto L210;
+ }
+/* PROCEDURE..SCALE-CHECK */
+L100:
+L110:
+ if (! (*dd1 <= rgamsq)) {
+ goto L130;
+ }
+ if (*dd1 == zero) {
+ goto L160;
+ }
+ igo = 0;
+ igo_fmt = fmt_120;
+/* FIX-H.. */
+ goto L70;
+L120:
+/* Computing 2nd power */
+ d__1 = gam;
+ *dd1 *= d__1 * d__1;
+ *dx1 /= gam;
+ dh11 /= gam;
+ dh12 /= gam;
+ goto L110;
+L130:
+L140:
+ if (! (*dd1 >= gamsq)) {
+ goto L160;
+ }
+ igo = 1;
+ igo_fmt = fmt_150;
+/* FIX-H.. */
+ goto L70;
+L150:
+/* Computing 2nd power */
+ d__1 = gam;
+ *dd1 /= d__1 * d__1;
+ *dx1 *= gam;
+ dh11 *= gam;
+ dh12 *= gam;
+ goto L140;
+L160:
+L170:
+ if (! (abs(*dd2) <= rgamsq)) {
+ goto L190;
+ }
+ if (*dd2 == zero) {
+ goto L220;
+ }
+ igo = 2;
+ igo_fmt = fmt_180;
+/* FIX-H.. */
+ goto L70;
+L180:
+/* Computing 2nd power */
+ d__1 = gam;
+ *dd2 *= d__1 * d__1;
+ dh21 /= gam;
+ dh22 /= gam;
+ goto L170;
+L190:
+L200:
+ if (! (abs(*dd2) >= gamsq)) {
+ goto L220;
+ }
+ igo = 3;
+ igo_fmt = fmt_210;
+/* FIX-H.. */
+ goto L70;
+L210:
+/* Computing 2nd power */
+ d__1 = gam;
+ *dd2 /= d__1 * d__1;
+ dh21 *= gam;
+ dh22 *= gam;
+ goto L200;
+L220:
+ if (dflag < 0.) {
+ goto L250;
+ } else if (dflag == 0) {
+ goto L230;
+ } else {
+ goto L240;
+ }
+L230:
+ dparam[3] = dh21;
+ dparam[4] = dh12;
+ goto L260;
+L240:
+ dparam[2] = dh11;
+ dparam[5] = dh22;
+ goto L260;
+L250:
+ dparam[2] = dh11;
+ dparam[3] = dh21;
+ dparam[4] = dh12;
+ dparam[5] = dh22;
+L260:
+ dparam[1] = dflag;
+ return 0;
+} /* drotmg_ */
+