uClibc now has a math library. muahahahaha!

 -Erik

1 files changed, 206 insertions, 0 deletions

diff --git a/libm/float/tandgf.c b/libm/float/tandgf.c
new file mode 100644
index 000000000..dc55ad5e4
--- /dev/null
+++ b/libm/float/tandgf.c
@@ -0,0 +1,206 @@
+/*							tandgf.c
+ *
+ *	Circular tangent of angle in degrees
+ *
+ *
+ *
+ * SYNOPSIS:
+ *
+ * float x, y, tandgf();
+ *
+ * y = tandgf( x );
+ *
+ *
+ *
+ * DESCRIPTION:
+ *
+ * Returns the circular tangent of the radian argument x.
+ *
+ * Range reduction is into intervals of 45 degrees.
+ *
+ *
+ *
+ *
+ * ACCURACY:
+ *
+ *                      Relative error:
+ * arithmetic   domain     # trials      peak         rms
+ *    IEEE     +-2^24       50000       2.4e-7      4.8e-8
+ *
+ * ERROR MESSAGES:
+ *
+ *   message         condition          value returned
+ * tanf total loss   x > 2^24              0.0
+ *
+ */
+/*							cotdgf.c
+ *
+ *	Circular cotangent of angle in degrees
+ *
+ *
+ *
+ * SYNOPSIS:
+ *
+ * float x, y, cotdgf();
+ *
+ * y = cotdgf( x );
+ *
+ *
+ *
+ * DESCRIPTION:
+ *
+ * Range reduction is into intervals of 45 degrees.
+ * A common routine computes either the tangent or cotangent.
+ *
+ *
+ *
+ * ACCURACY:
+ *
+ *                      Relative error:
+ * arithmetic   domain     # trials      peak         rms
+ *    IEEE     +-2^24       50000       2.4e-7      4.8e-8
+ *
+ *
+ * ERROR MESSAGES:
+ *
+ *   message         condition          value returned
+ * cot total loss   x > 2^24                0.0
+ * cot singularity  x = 0                  MAXNUMF
+ *
+ */
+
+/*
+Cephes Math Library Release 2.2:  June, 1992
+Copyright 1984, 1987, 1989, 1992 by Stephen L. Moshier
+Direct inquiries to 30 Frost Street, Cambridge, MA 02140
+*/
+
+/* Single precision circular tangent
+ * test interval: [-pi/4, +pi/4]
+ * trials: 10000
+ * peak relative error: 8.7e-8
+ * rms relative error: 2.8e-8
+ */
+#include <math.h>
+
+extern float MAXNUMF;
+
+static float T24M1 = 16777215.;
+static float PI180 = 0.0174532925199432957692; /* pi/180 */
+
+static float tancotf( float xx, int cotflg )
+{
+float x, y, z, zz;
+long j;
+int sign;
+
+
+/* make argument positive but save the sign */
+if( xx < 0.0 )
+	{
+	x = -xx;
+	sign = -1;
+	}
+else
+	{
+	x = xx;
+	sign = 1;
+	}
+
+if( x > T24M1 )
+	{
+	if( cotflg )
+		mtherr( "cotdgf", TLOSS );
+	else
+		mtherr( "tandgf", TLOSS );
+	return(0.0);
+	}
+
+/* compute x mod PIO4 */
+j = 0.022222222222222222222 * x; /* integer part of x/45 */
+y = j;
+
+/* map zeros and singularities to origin */
+if( j & 1 )
+	{
+	j += 1;
+	y += 1.0;
+	}
+
+z = x - y * 45.0;
+z *= PI180;	/* multiply by pi/180 to convert to radians */
+
+zz = z * z;
+
+if( x > 1.0e-4 )
+	{
+/* 1.7e-8 relative error in [-pi/4, +pi/4] */
+	y =
+	((((( 9.38540185543E-3 * zz
+	+ 3.11992232697E-3) * zz
+	+ 2.44301354525E-2) * zz
+	+ 5.34112807005E-2) * zz
+	+ 1.33387994085E-1) * zz
+	+ 3.33331568548E-1) * zz * z
+	+ z;
+	}
+else
+	{
+	y = z;
+	}
+
+if( j & 2 )
+	{
+	if( cotflg )
+		y = -y;
+	else
+		{
+		if( y != 0.0 )
+			{
+			y = -1.0/y;
+			}
+		else
+			{
+			mtherr( "tandgf", SING );
+			y = MAXNUMF;
+			}
+		}
+	}
+else
+	{
+	if( cotflg )
+		{
+		if( y != 0.0 )
+			y = 1.0/y;
+		else
+			{
+			mtherr( "cotdgf", SING );
+			y = MAXNUMF;
+			}
+		}
+	}
+
+if( sign < 0 )
+	y = -y;
+
+return( y );
+}
+
+
+float tandgf( float x )
+{
+
+return( tancotf(x,0) );
+}
+
+float cotdgf( float x )
+{
+
+if( x == 0.0 )
+	{
+	mtherr( "cotdgf", SING );
+	return( MAXNUMF );
+	}
+return( tancotf(x,1) );
+}
+