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

1 files changed, 0 insertions, 156 deletions

diff --git a/libm/float/powif.c b/libm/float/powif.c
deleted file mode 100644
index d226896ba..000000000
--- a/libm/float/powif.c
+++ /dev/null
@@ -1,156 +0,0 @@
-/*							powif.c
- *
- *	Real raised to integer power
- *
- *
- *
- * SYNOPSIS:
- *
- * float x, y, powif();
- * int n;
- *
- * y = powif( x, n );
- *
- *
- *
- * DESCRIPTION:
- *
- * Returns argument x raised to the nth power.
- * The routine efficiently decomposes n as a sum of powers of
- * two. The desired power is a product of two-to-the-kth
- * powers of x.  Thus to compute the 32767 power of x requires
- * 28 multiplications instead of 32767 multiplications.
- *
- *
- *
- * ACCURACY:
- *
- *
- *                      Relative error:
- * arithmetic   x domain   n domain  # trials      peak         rms
- *    IEEE      .04,26     -26,26    100000       1.1e-6      2.0e-7
- *    IEEE        1,2      -128,128  100000       1.1e-5      1.0e-6
- *
- * Returns MAXNUMF on overflow, zero on underflow.
- *
- */
-
-/*							powi.c	*/
-
-/*
-Cephes Math Library Release 2.2:  June, 1992
-Copyright 1984, 1987, 1989 by Stephen L. Moshier
-Direct inquiries to 30 Frost Street, Cambridge, MA 02140
-*/
-
-#include <math.h>
-extern float MAXNUMF, MAXLOGF, MINLOGF, LOGE2F;
-
-float frexpf( float, int * );
-
-float powif( float x, int nn )
-{
-int n, e, sign, asign, lx;
-float w, y, s;
-
-if( x == 0.0 )
-	{
-	if( nn == 0 )
-		return( 1.0 );
-	else if( nn < 0 )
-		return( MAXNUMF );
-	else
-		return( 0.0 );
-	}
-
-if( nn == 0 )
-	return( 1.0 );
-
-
-if( x < 0.0 )
-	{
-	asign = -1;
-	x = -x;
-	}
-else
-	asign = 0;
-
-
-if( nn < 0 )
-	{
-	sign = -1;
-	n = -nn;
-/*
-	x = 1.0/x;
-*/
-	}
-else
-	{
-	sign = 0;
-	n = nn;
-	}
-
-/* Overflow detection */
-
-/* Calculate approximate logarithm of answer */
-s = frexpf( x, &lx );
-e = (lx - 1)*n;
-if( (e == 0) || (e > 64) || (e < -64) )
-	{
-	s = (s - 7.0710678118654752e-1) / (s +  7.0710678118654752e-1);
-	s = (2.9142135623730950 * s - 0.5 + lx) * nn * LOGE2F;
-	}
-else
-	{
-	s = LOGE2F * e;
-	}
-
-if( s > MAXLOGF )
-	{
-	mtherr( "powi", OVERFLOW );
-	y = MAXNUMF;
-	goto done;
-	}
-
-if( s < MINLOGF )
-	return(0.0);
-
-/* Handle tiny denormal answer, but with less accuracy
- * since roundoff error in 1.0/x will be amplified.
- * The precise demarcation should be the gradual underflow threshold.
- */
-if( s < (-MAXLOGF+2.0) )
-	{
-	x = 1.0/x;
-	sign = 0;
-	}
-
-/* First bit of the power */
-if( n & 1 )
-	y = x;
-		
-else
-	{
-	y = 1.0;
-	asign = 0;
-	}
-
-w = x;
-n >>= 1;
-while( n )
-	{
-	w = w * w;	/* arg to the 2-to-the-kth power */
-	if( n & 1 )	/* if that bit is set, then include in product */
-		y *= w;
-	n >>= 1;
-	}
-
-
-done:
-
-if( asign )
-	y = -y; /* odd power of negative number */
-if( sign )
-	y = 1.0/y;
-return(y);
-}