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authorUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
committerUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
commita334319f6530564d22e775935d9c91663623a1b4 (patch)
treeb5877475619e4c938e98757d518bb1e9cbead751 /sysdeps/generic/s_csqrtf.c
parent0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (diff)
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(CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.
Diffstat (limited to 'sysdeps/generic/s_csqrtf.c')
-rw-r--r--sysdeps/generic/s_csqrtf.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/sysdeps/generic/s_csqrtf.c b/sysdeps/generic/s_csqrtf.c
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+++ b/sysdeps/generic/s_csqrtf.c
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+/* Complex square root of float value.
+   Copyright (C) 1997, 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Based on an algorithm by Stephen L. Moshier <moshier@world.std.com>.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <complex.h>
+#include <math.h>
+
+#include "math_private.h"
+
+
+__complex__ float
+__csqrtf (__complex__ float x)
+{
+  __complex__ float res;
+  int rcls = fpclassify (__real__ x);
+  int icls = fpclassify (__imag__ x);
+
+  if (rcls <= FP_INFINITE || icls <= FP_INFINITE)
+    {
+      if (icls == FP_INFINITE)
+	{
+	  __real__ res = HUGE_VALF;
+	  __imag__ res = __imag__ x;
+	}
+      else if (rcls == FP_INFINITE)
+	{
+	  if (__real__ x < 0.0)
+	    {
+	      __real__ res = icls == FP_NAN ? __nanf ("") : 0;
+	      __imag__ res = __copysignf (HUGE_VALF, __imag__ x);
+	    }
+	  else
+	    {
+	      __real__ res = __real__ x;
+	      __imag__ res = (icls == FP_NAN
+			      ? __nanf ("") : __copysignf (0.0, __imag__ x));
+	    }
+	}
+      else
+	{
+	  __real__ res = __nanf ("");
+	  __imag__ res = __nanf ("");
+	}
+    }
+  else
+    {
+      if (icls == FP_ZERO)
+	{
+	  if (__real__ x < 0.0)
+	    {
+	      __real__ res = 0.0;
+	      __imag__ res = __copysignf (__ieee754_sqrtf (-__real__ x),
+					  __imag__ x);
+	    }
+	  else
+	    {
+	      __real__ res = fabsf (__ieee754_sqrtf (__real__ x));
+	      __imag__ res = __copysignf (0.0, __imag__ x);
+	    }
+	}
+      else if (rcls == FP_ZERO)
+	{
+	  float r = __ieee754_sqrtf (0.5 * fabsf (__imag__ x));
+
+	  __real__ res = __copysignf (r, __imag__ x);
+	  __imag__ res = r;
+	}
+      else
+	{
+	  float d, r, s;
+
+	  d = __ieee754_hypotf (__real__ x, __imag__ x);
+	  /* Use the identity   2  Re res  Im res = Im x
+	     to avoid cancellation error in  d +/- Re x.  */
+	  if (__real__ x > 0)
+	    {
+	      r = __ieee754_sqrtf (0.5f * d + 0.5f * __real__ x);
+	      s = (0.5f * __imag__ x) / r;
+	    }
+	  else
+	    {
+	      s = __ieee754_sqrtf (0.5f * d - 0.5f * __real__ x);
+	      r = fabsf ((0.5f * __imag__ x) / s);
+	    }
+
+	  __real__ res = r;
+	  __imag__ res = __copysignf (s, __imag__ x);
+	}
+    }
+
+  return res;
+}
+#ifndef __csqrtf
+weak_alias (__csqrtf, csqrtf)
+#endif