first commit of the new libm!

[musl] / src / math / e_atanh.c

diff --git a/src/math/e_atanh.c b/src/math/e_atanh.c
deleted file mode 100644 (file)
index 45f1c96..0000000
--- a/src/math/e_atanh.c
+++ /dev/null
@@ -1,59 +0,0 @@
-
-/* @(#)e_atanh.c 1.3 95/01/18 */
-/*
- * ====================================================
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
- *
- * Developed at SunSoft, a Sun Microsystems, Inc. business.
- * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice 
- * is preserved.
- * ====================================================
- *
- */
-
-/* atanh(x)
- * Method :
- *    1.Reduced x to positive by atanh(-x) = -atanh(x)
- *    2.For x>=0.5
- *                  1              2x                          x
- *      atanh(x) = --- * log(1 + -------) = 0.5 * log1p(2 * --------)
- *                  2             1 - x                      1 - x
- *      
- *      For x<0.5
- *      atanh(x) = 0.5*log1p(2x+2x*x/(1-x))
- *
- * Special cases:
- *      atanh(x) is NaN if |x| > 1 with signal;
- *      atanh(NaN) is that NaN with no signal;
- *      atanh(+-1) is +-INF with signal.
- *
- */
-
-#include <math.h>
-#include "math_private.h"
-
-static const double one = 1.0, huge = 1e300;
-static const double zero = 0.0;
-
-double
-atanh(double x)
-{
-        double t;
-        int32_t hx,ix;
-        uint32_t lx;
-        EXTRACT_WORDS(hx,lx,x);
-        ix = hx&0x7fffffff;
-        if ((ix|((lx|(-lx))>>31))>0x3ff00000) /* |x|>1 */
-            return (x-x)/(x-x);
-        if(ix==0x3ff00000) 
-            return x/zero;
-        if(ix<0x3e300000&&(huge+x)>zero) return x;      /* x<2**-28 */
-        SET_HIGH_WORD(x,ix);
-        if(ix<0x3fe00000) {             /* x < 0.5 */
-            t = x+x;
-            t = 0.5*log1p(t+t*x/(one-x));
-        } else 
-            t = 0.5*log1p((x+x)/(one-x));
-        if(hx>=0) return t; else return -t;
-}