Imported gcc-4.4.3

[msp430-gcc.git] / libf2c / libF77 / z_log.c

diff --git a/libf2c/libF77/z_log.c b/libf2c/libF77/z_log.c
deleted file mode 100644 (file)
index 9dcc7f7..0000000
--- a/libf2c/libF77/z_log.c
+++ /dev/null
@@ -1,63 +0,0 @@
-#include "f2c.h"
-
-#ifdef KR_headers
-double log(), f__cabs(), atan2();
-VOID z_log(r, z) doublecomplex *r, *z;
-#else
-#undef abs
-#include "math.h"
-extern double f__cabs(double, double);
-void z_log(doublecomplex *r, doublecomplex *z)
-#endif
-{
-       double s, s0, t, t2, u, v;
-       double zi = z->i, zr = z->r;
-
-       r->i = atan2(zi, zr);
-#ifdef Pre20000310
-       r->r = log( f__cabs( zr, zi ) );
-#else
-       if (zi < 0)
-               zi = -zi;
-       if (zr < 0)
-               zr = -zr;
-       if (zr < zi) {
-               t = zi;
-               zi = zr;
-               zr = t;
-               }
-       t = zi/zr;
-       s = zr * sqrt(1 + t*t);
-       /* now s = f__cabs(zi,zr), and zr = |zr| >= |zi| = zi */
-       if ((t = s - 1) < 0)
-               t = -t;
-       if (t > .01)
-               r->r = log(s);
-       else {
-
-#ifdef Comment
-
-       log(1+x) = x - x^2/2 + x^3/3 - x^4/4 + - ...
-
-                = x(1 - x/2 + x^2/3 -+...)
-
-       [sqrt(y^2 + z^2) - 1] * [sqrt(y^2 + z^2) + 1] = y^2 + z^2 - 1, so
-
-       sqrt(y^2 + z^2) - 1 = (y^2 + z^2 - 1) / [sqrt(y^2 + z^2) + 1]
-
-#endif /*Comment*/
-
-               t = ((zr*zr - 1.) + zi*zi) / (s + 1);
-               t2 = t*t;
-               s = 1. - 0.5*t;
-               u = v = 1;
-               do {
-                       s0 = s;
-                       u *= t2;
-                       v += 2;
-                       s += u/v - t*u/(v+1);
-                       } while(s > s0);
-               r->r = s*t;
-               }
-#endif
-       }