import newlib-2000-02-17 snapshot

1 files changed, 166 insertions, 0 deletions

diff --git a/newlib/libm/mathfp/s_sine.c b/newlib/libm/mathfp/s_sine.c
new file mode 100644
index 000000000..9642f4a56
--- /dev/null
+++ b/newlib/libm/mathfp/s_sine.c
@@ -0,0 +1,166 @@
+
+/* @(#)z_sine.c 1.0 98/08/13 */
+/******************************************************************
+ * The following routines are coded directly from the algorithms
+ * and coefficients given in "Software Manual for the Elementary
+ * Functions" by William J. Cody, Jr. and William Waite, Prentice
+ * Hall, 1980.
+ ******************************************************************/
+
+/*
+FUNCTION
+        <<sin>>, <<cos>>, <<sine>>, <<sinf>>, <<cosf>>, <<sinef>>---sine or cosine
+INDEX
+sin
+INDEX
+sinf
+INDEX
+cos
+INDEX
+cosf
+ANSI_SYNOPSIS
+        #include <math.h>
+        double sin(double <[x]>);
+        float  sinf(float <[x]>);
+        double cos(double <[x]>);
+        float cosf(float <[x]>);
+
+TRAD_SYNOPSIS
+        #include <math.h>
+        double sin(<[x]>)
+        double <[x]>;
+        float  sinf(<[x]>)
+        float <[x]>;
+
+        double cos(<[x]>)
+        double <[x]>;
+        float cosf(<[x]>)
+        float <[x]>;
+
+DESCRIPTION
+        <<sin>> and <<cos>> compute (respectively) the sine and cosine
+        of the argument <[x]>.  Angles are specified in radians.
+RETURNS
+        The sine or cosine of <[x]> is returned.
+
+PORTABILITY
+        <<sin>> and <<cos>> are ANSI C.
+        <<sinf>> and <<cosf>> are extensions.
+
+QUICKREF
+        sin ansi pure
+        sinf - pure
+*/
+
+/******************************************************************
+ * sine
+ *
+ * Input:
+ *   x - floating point value
+ *   cosine - indicates cosine value
+ *
+ * Output:
+ *   Sine of x.
+ *
+ * Description:
+ *   This routine calculates sines and cosines.
+ *
+ *****************************************************************/
+
+#include "fdlibm.h"
+#include "zmath.h"
+
+#ifndef _DOUBLE_IS_32BITS
+
+static const double HALF_PI = 1.57079632679489661923;
+static const double ONE_OVER_PI = 0.31830988618379067154;
+static const double r[] = { -0.16666666666666665052,
+                             0.83333333333331650314e-02,
+                            -0.19841269841201840457e-03,
+                             0.27557319210152756119e-05,
+                            -0.25052106798274584544e-07,
+                             0.16058936490371589114e-09,
+                            -0.76429178068910467734e-12,
+                             0.27204790957888846175e-14 };
+
+double
+_DEFUN (sine, (double, int),
+        double x _AND
+        int cosine)
+{
+  int sgn, N;
+  double y, XN, g, R, res;
+  double YMAX = 210828714.0;
+
+  switch (numtest (x))
+    {
+      case NAN:
+        errno = EDOM;
+        return (x);
+      case INF:
+        errno = EDOM;
+        return (z_notanum.d); 
+    }
+
+  /* Use sin and cos properties to ease computations. */
+  if (cosine)
+    {
+      sgn = 1;
+      y = fabs (x) + HALF_PI;
+    }
+  else
+    {
+      if (x < 0.0)
+        {
+          sgn = -1;
+          y = -x;
+        }
+      else
+        {
+          sgn = 1;
+          y = x;
+        }
+    }
+
+  /* Check for values of y that will overflow here. */
+  if (y > YMAX)
+    {
+      errno = ERANGE;
+      return (x);
+    }
+
+  /* Calculate the exponent. */
+  if (y < 0.0)
+    N = (int) (y * ONE_OVER_PI - 0.5);
+  else
+    N = (int) (y * ONE_OVER_PI + 0.5);
+  XN = (double) N;
+
+  if (N & 1)
+    sgn = -sgn;
+
+  if (cosine)
+    XN -= 0.5;
+
+  y = fabs (x) - XN * __PI;
+
+  if (-z_rooteps < y && y < z_rooteps)
+    res = y;
+
+  else
+    {
+      g = y * y;
+
+      /* Calculate the Taylor series. */
+      R = (((((((r[6] * g + r[5]) * g + r[4]) * g + r[3]) * g + r[2]) * g + r[1]) * g + r[0]) * g);
+
+      /* Finally, compute the result. */
+      res = y + y * R;
+    }
+ 
+  res *= sgn;
+
+  return (res);
+}
+
+#endif /* _DOUBLE_IS_32BITS */