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, 186 deletions

diff --git a/libm/double/powi.c b/libm/double/powi.c
deleted file mode 100644
index 46d9a1400..000000000
--- a/libm/double/powi.c
+++ /dev/null
@@ -1,186 +0,0 @@
-/*							powi.c
- *
- *	Real raised to integer power
- *
- *
- *
- * SYNOPSIS:
- *
- * double x, y, powi();
- * int n;
- *
- * y = powi( 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
- *    DEC       .04,26     -26,26    100000       2.7e-16     4.3e-17
- *    IEEE      .04,26     -26,26     50000       2.0e-15     3.8e-16
- *    IEEE        1,2    -1022,1023   50000       8.6e-14     1.6e-14
- *
- * Returns MAXNUM on overflow, zero on underflow.
- *
- */
-
-/*							powi.c	*/
-
-/*
-Cephes Math Library Release 2.8:  June, 2000
-Copyright 1984, 1995, 2000 by Stephen L. Moshier
-*/
-
-#include <math.h>
-#ifdef ANSIPROT
-extern double log ( double );
-extern double frexp ( double, int * );
-extern int signbit ( double );
-#else
-double log(), frexp();
-int signbit();
-#endif
-extern double NEGZERO, INFINITY, MAXNUM, MAXLOG, MINLOG, LOGE2;
-
-double powi( x, nn )
-double x;
-int nn;
-{
-int n, e, sign, asign, lx;
-double w, y, s;
-
-/* See pow.c for these tests.  */
-if( x == 0.0 )
-	{
-	if( nn == 0 )
-		return( 1.0 );
-	else if( nn < 0 )
-	    return( INFINITY );
-	else
-	  {
-	    if( nn & 1 )
-	      return( x );
-	    else
-	      return( 0.0 );
-	  }
-	}
-
-if( nn == 0 )
-	return( 1.0 );
-
-if( nn == -1 )
-	return( 1.0/x );
-
-if( x < 0.0 )
-	{
-	asign = -1;
-	x = -x;
-	}
-else
-	asign = 0;
-
-
-if( nn < 0 )
-	{
-	sign = -1;
-	n = -nn;
-	}
-else
-	{
-	sign = 1;
-	n = nn;
-	}
-
-/* Even power will be positive. */
-if( (n & 1) == 0 )
-	asign = 0;
-
-/* Overflow detection */
-
-/* Calculate approximate logarithm of answer */
-s = frexp( 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 * LOGE2;
-	}
-else
-	{
-	s = LOGE2 * e;
-	}
-
-if( s > MAXLOG )
-	{
-	mtherr( "powi", OVERFLOW );
-	y = INFINITY;
-	goto done;
-	}
-
-#if DENORMAL
-if( s < MINLOG )
-	{
-	y = 0.0;
-	goto done;
-	}
-
-/* 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 < (-MAXLOG+2.0)) && (sign < 0) )
-	{
-	x = 1.0/x;
-	sign = -sign;
-	}
-#else
-/* do not produce denormal answer */
-if( s < -MAXLOG )
-	return(0.0);
-#endif
-
-
-/* First bit of the power */
-if( n & 1 )
-	y = x;
-		
-else
-	y = 1.0;
-
-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;
-	}
-
-if( sign < 0 )
-	y = 1.0/y;
-
-done:
-
-if( asign )
-	{
-	/* odd power of negative number */
-	if( y == 0.0 )
-		y = NEGZERO;
-	else
-		y = -y;
-	}
-return(y);
-}