m68k specific complex cosine implementation.

2024-12-27 04:41:02 +08:00 · 1997-05-07 15:27:03 +00:00 · 1997-05-07 15:27:03 +00:00 · bc99330920
commit bc99330920
parent 4291e75751
1 changed files with 73 additions and 0 deletions
--- a/sysdeps/m68k/fpu/s_ccos.c
+++ b/sysdeps/m68k/fpu/s_ccos.c
@ -0,0 +1,73 @@
+/* Complex cosine function.  m68k fpu version
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#define __LIBC_M81_MATH_INLINES
+#include <complex.h>
+#include <math.h>
+
+#ifndef SUFF
+#define SUFF
+#endif
+#ifndef float_type
+#define float_type double
+#endif
+
+#define CONCATX(a,b) __CONCAT(a,b)
+#define s(name) CONCATX(name,SUFF)
+#define m81(func) __m81_u(s(func))
+
+__complex__ float_type
+s(__ccos) (__complex__ float_type x)
+{
+  __complex__ float_type retval;
+  unsigned long rx_cond = __m81_test (__real__ x);
+
+  if ((rx_cond & (__M81_COND_INF|__M81_COND_NAN)) == 0)
+    {
+      /* Real part is finite.  */
+      float_type sin_rx, cos_rx;
+
+      __asm ("fsincos%.x %2,%1:%0" : "=f" (sin_rx), "=f" (cos_rx)
+	     : "f" (__real__ x));
+      __real__ retval = cos_rx * m81(__ieee754_cosh) (__imag__ x);
+      if (rx_cond & __M81_COND_ZERO)
+	__imag__ retval = (m81(__signbit) (__imag__ x)
+			   ? __real__ x : -__real__ x);
+      else
+	__imag__ retval = -sin_rx * m81(__ieee754_sinh) (__imag__ x);
+    }
+  else
+    {
+      unsigned long ix_cond = __m81_test (__imag__ x);
+
+      if (ix_cond & __M81_COND_INF)
+	__real__ retval = s(fabs) (__imag__ x);
+      else
+	__real__ retval = __real__ x - __real__ x;
+      if (ix_cond & __M81_COND_ZERO)
+	__imag__ retval = __imag__ x;
+      else
+	__imag__ retval = __real__ x - __real__ x;
+    }
+
+  return retval;
+}
+#define weak_aliasx(a,b) weak_alias(a,b)
+weak_aliasx (s(__ccos), s(ccos))