Prepare to convert _Complex sine functions

This patch has no function changes, except to
ensure the git history correctly tracks the
changes to convert the double version of these
functions into a templated version.

1 files changed, 171 insertions, 0 deletions

diff --git a/math/s_csin_template.c b/math/s_csin_template.c
new file mode 100644
index 0000000000..e071aa650e
--- /dev/null
+++ b/math/s_csin_template.c
@@ -0,0 +1,171 @@
+/* Complex sine function for double.
+   Copyright (C) 1997-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <complex.h>
+#include <fenv.h>
+#include <math.h>
+#include <math_private.h>
+#include <float.h>
+
+__complex__ double
+__csin (__complex__ double x)
+{
+  __complex__ double retval;
+  int negate = signbit (__real__ x);
+  int rcls = fpclassify (__real__ x);
+  int icls = fpclassify (__imag__ x);
+
+  __real__ x = fabs (__real__ x);
+
+  if (__glibc_likely (icls >= FP_ZERO))
+    {
+      /* Imaginary part is finite.  */
+      if (__glibc_likely (rcls >= FP_ZERO))
+	{
+	  /* Real part is finite.  */
+	  const int t = (int) ((DBL_MAX_EXP - 1) * M_LN2);
+	  double sinix, cosix;
+
+	  if (__glibc_likely (__real__ x > DBL_MIN))
+	    {
+	      __sincos (__real__ x, &sinix, &cosix);
+	    }
+	  else
+	    {
+	      sinix = __real__ x;
+	      cosix = 1.0;
+	    }
+
+	  if (negate)
+	    sinix = -sinix;
+
+	  if (fabs (__imag__ x) > t)
+	    {
+	      double exp_t = __ieee754_exp (t);
+	      double ix = fabs (__imag__ x);
+	      if (signbit (__imag__ x))
+		cosix = -cosix;
+	      ix -= t;
+	      sinix *= exp_t / 2.0;
+	      cosix *= exp_t / 2.0;
+	      if (ix > t)
+		{
+		  ix -= t;
+		  sinix *= exp_t;
+		  cosix *= exp_t;
+		}
+	      if (ix > t)
+		{
+		  /* Overflow (original imaginary part of x > 3t).  */
+		  __real__ retval = DBL_MAX * sinix;
+		  __imag__ retval = DBL_MAX * cosix;
+		}
+	      else
+		{
+		  double exp_val = __ieee754_exp (ix);
+		  __real__ retval = exp_val * sinix;
+		  __imag__ retval = exp_val * cosix;
+		}
+	    }
+	  else
+	    {
+	      __real__ retval = __ieee754_cosh (__imag__ x) * sinix;
+	      __imag__ retval = __ieee754_sinh (__imag__ x) * cosix;
+	    }
+
+	  math_check_force_underflow_complex (retval);
+	}
+      else
+	{
+	  if (icls == FP_ZERO)
+	    {
+	      /* Imaginary part is 0.0.  */
+	      __real__ retval = __nan ("");
+	      __imag__ retval = __imag__ x;
+
+	      if (rcls == FP_INFINITE)
+		feraiseexcept (FE_INVALID);
+	    }
+	  else
+	    {
+	      __real__ retval = __nan ("");
+	      __imag__ retval = __nan ("");
+
+	      feraiseexcept (FE_INVALID);
+	    }
+	}
+    }
+  else if (icls == FP_INFINITE)
+    {
+      /* Imaginary part is infinite.  */
+      if (rcls == FP_ZERO)
+	{
+	  /* Real part is 0.0.  */
+	  __real__ retval = __copysign (0.0, negate ? -1.0 : 1.0);
+	  __imag__ retval = __imag__ x;
+	}
+      else if (rcls > FP_ZERO)
+	{
+	  /* Real part is finite.  */
+	  double sinix, cosix;
+
+	  if (__glibc_likely (__real__ x > DBL_MIN))
+	    {
+	      __sincos (__real__ x, &sinix, &cosix);
+	    }
+	  else
+	    {
+	      sinix = __real__ x;
+	      cosix = 1.0;
+	    }
+
+	  __real__ retval = __copysign (HUGE_VAL, sinix);
+	  __imag__ retval = __copysign (HUGE_VAL, cosix);
+
+	  if (negate)
+	    __real__ retval = -__real__ retval;
+	  if (signbit (__imag__ x))
+	    __imag__ retval = -__imag__ retval;
+	}
+      else
+	{
+	  /* The addition raises the invalid exception.  */
+	  __real__ retval = __nan ("");
+	  __imag__ retval = HUGE_VAL;
+
+	  if (rcls == FP_INFINITE)
+	    feraiseexcept (FE_INVALID);
+	}
+    }
+  else
+    {
+      if (rcls == FP_ZERO)
+	__real__ retval = __copysign (0.0, negate ? -1.0 : 1.0);
+      else
+	__real__ retval = __nan ("");
+      __imag__ retval = __nan ("");
+    }
+
+  return retval;
+}
+weak_alias (__csin, csin)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__csin, __csinl)
+weak_alias (__csin, csinl)
+#endif