From 7ce331c01ce6eb7b3f5c715a38a24359da9c6ee2 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Thu, 22 Nov 2001 14:04:29 +0000
Subject: Totally rework the math library, this time based on the MacOs X math
 library (which is itself based on the math lib from FreeBSD).  -Erik

---
 libm/float/asinf.c | 186 -----------------------------------------------------
 1 file changed, 186 deletions(-)
 delete mode 100644 libm/float/asinf.c

(limited to 'libm/float/asinf.c')

diff --git a/libm/float/asinf.c b/libm/float/asinf.c
deleted file mode 100644
index c96d75acb..000000000
--- a/libm/float/asinf.c
+++ /dev/null
@@ -1,186 +0,0 @@
-/*							asinf.c
- *
- *	Inverse circular sine
- *
- *
- *
- * SYNOPSIS:
- *
- * float x, y, asinf();
- *
- * y = asinf( x );
- *
- *
- *
- * DESCRIPTION:
- *
- * Returns radian angle between -pi/2 and +pi/2 whose sine is x.
- *
- * A polynomial of the form x + x**3 P(x**2)
- * is used for |x| in the interval [0, 0.5].  If |x| > 0.5 it is
- * transformed by the identity
- *
- *    asin(x) = pi/2 - 2 asin( sqrt( (1-x)/2 ) ).
- *
- *
- * ACCURACY:
- *
- *                      Relative error:
- * arithmetic   domain     # trials      peak         rms
- *    IEEE     -1, 1       100000       2.5e-7       5.0e-8
- *
- *
- * ERROR MESSAGES:
- *
- *   message         condition      value returned
- * asinf domain        |x| > 1           0.0
- *
- */
-/*							acosf()
- *
- *	Inverse circular cosine
- *
- *
- *
- * SYNOPSIS:
- *
- * float x, y, acosf();
- *
- * y = acosf( x );
- *
- *
- *
- * DESCRIPTION:
- *
- * Returns radian angle between -pi/2 and +pi/2 whose cosine
- * is x.
- *
- * Analytically, acos(x) = pi/2 - asin(x).  However if |x| is
- * near 1, there is cancellation error in subtracting asin(x)
- * from pi/2.  Hence if x < -0.5,
- *
- *    acos(x) =	 pi - 2.0 * asin( sqrt((1+x)/2) );
- *
- * or if x > +0.5,
- *
- *    acos(x) =	 2.0 * asin(  sqrt((1-x)/2) ).
- *
- *
- * ACCURACY:
- *
- *                      Relative error:
- * arithmetic   domain     # trials      peak         rms
- *    IEEE      -1, 1      100000       1.4e-7      4.2e-8
- *
- *
- * ERROR MESSAGES:
- *
- *   message         condition      value returned
- * acosf domain        |x| > 1           0.0
- */
-
-/*							asin.c	*/
-
-/*
-Cephes Math Library Release 2.2:  June, 1992
-Copyright 1984, 1987, 1992 by Stephen L. Moshier
-Direct inquiries to 30 Frost Street, Cambridge, MA 02140
-*/
-
-/* Single precision circular arcsine
- * test interval: [-0.5, +0.5]
- * trials: 10000
- * peak relative error: 6.7e-8
- * rms relative error: 2.5e-8
- */
-#include <math.h>
-extern float PIF, PIO2F;
-
-float sqrtf( float );
-
-float asinf( float xx )
-{
-float a, x, z;
-int sign, flag;
-
-x = xx;
-
-if( x > 0 )
-	{
-	sign = 1;
-	a = x;
-	}
-else
-	{
-	sign = -1;
-	a = -x;
-	}
-
-if( a > 1.0 )
-	{
-	mtherr( "asinf", DOMAIN );
-	return( 0.0 );
-	}
-
-if( a < 1.0e-4 )
-	{
-	z = a;
-	goto done;
-	}
-
-if( a > 0.5 )
-	{
-	z = 0.5 * (1.0 - a);
-	x = sqrtf( z );
-	flag = 1;
-	}
-else
-	{
-	x = a;
-	z = x * x;
-	flag = 0;
-	}
-
-z =
-(((( 4.2163199048E-2 * z
-  + 2.4181311049E-2) * z
-  + 4.5470025998E-2) * z
-  + 7.4953002686E-2) * z
-  + 1.6666752422E-1) * z * x
-  + x;
-
-if( flag != 0 )
-	{
-	z = z + z;
-	z = PIO2F - z;
-	}
-done:
-if( sign < 0 )
-	z = -z;
-return( z );
-}
-
-
-
-
-float acosf( float x )
-{
-
-if( x < -1.0 )
-	goto domerr;
-
-if( x < -0.5) 
-	return( PIF - 2.0 * asinf( sqrtf(0.5*(1.0+x)) ) );
-
-if( x > 1.0 )
-	{
-domerr:	mtherr( "acosf", DOMAIN );
-	return( 0.0 );
-	}
-
-if( x > 0.5 )
-	return( 2.0 * asinf(  sqrtf(0.5*(1.0-x) ) ) );
-
-return( PIO2F - asinf(x) );
-}
-
-- 
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