1 files changed, 110 insertions, 0 deletions
diff --git a/libstdc++-v3/math/csqrtf.c b/libstdc++-v3/math/csqrtf.c
new file mode 100644
index 0000000..a239588
--- /dev/null
+++ b/libstdc++-v3/math/csqrtf.c
@@ -0,0 +1,110 @@
+/* Complex square root of float value. */
+
+/* Copyright (C) 1997-1999 Free Software Foundation, Inc.
+
+   This file is part of the GNU ISO C++ Library.  This library is free
+   software; you can redistribute it and/or modify it under the
+   terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with this library; see the file COPYING.  If not, write to the Free
+   Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+   USA.
+
+   As a special exception, you may use this file as part of a free software
+   library without restriction.  Specifically, if other files instantiate
+   templates or use macros or inline functions from this file, or you compile
+   this file and link it with other files to produce an executable, this
+   file does not by itself cause the resulting executable to be covered by
+   the GNU General Public License.  This exception does not however
+   invalidate any other reasons why the executable file might be covered by
+   the GNU General Public License.  */
+
+
+#include <math.h>
+#include "mathconf.h"
+
+
+__complex__ float
+csqrtf (__complex__ float x)
+{
+  __complex__ float res;
+
+  if (!FINITEF_P (__real__ x) || !FINITEF_P (__imag__ x))
+    {
+      if (INFINITEF_P (__imag__ x))
+	{
+	  __real__ res = HUGE_VALF;
+	  __imag__ res = __imag__ x;
+	}
+      else if (INFINITEF_P (__real__ x))
+	{
+	  if (__real__ x < 0.0)
+	    {
+	      __real__ res = __imag__ x != __imag__ x ? NAN : 0;
+	      __imag__ res = copysignf (HUGE_VALF, __imag__ x);
+	    }
+	  else
+	    {
+	      __real__ res = __real__ x;
+	      __imag__ res = (__imag__ x != __imag__ x
+			      ? NAN : copysignf (0.0, __imag__ x));
+	    }
+	}
+      else
+	{
+	  __real__ res = NAN;
+	  __imag__ res = NAN;
+	}
+    }
+  else
+    {
+      if (__imag__ x == 0.0)
+	{
+	  if (__real__ x < 0.0)
+	    {
+	      __real__ res = 0.0;
+	      __imag__ res = copysignf (sqrtf (-__real__ x), __imag__ x);
+	    }
+	  else
+	    {
+	      __real__ res = fabsf (sqrtf (__real__ x));
+	      __imag__ res = copysignf (0.0, __imag__ x);
+	    }
+	}
+      else if (__real__ x == 0.0)
+	{
+	  float r = sqrtf (0.5 * fabsf (__imag__ x));
+
+	  __real__ res = copysignf (r, __imag__ x);
+	  __imag__ res = r;
+	}
+      else
+	{
+	  __complex__ float q;
+	  float t, r;
+
+	  if (fabsf (__imag__ x) < 2.0e-4 * fabsf (__real__ x))
+	    t = 0.25 * __imag__ x * (__imag__ x / __real__ x);
+	  else
+	    t = 0.5 * (hypotf (__real__ x, __imag__ x) - __real__ x);
+
+	  r = sqrtf (t);
+
+	  __real__ q = __imag__ x / (2.0 * r);
+	  __imag__ q = r;
+
+	  /* Heron iteration in complex arithmetic.  */
+	  res = 0.5 * (q + q / x);
+	}
+    }
+
+  return res;
+}