first commit of the new libm!

[musl] / src / math / k_tanf.c

diff --git a/src/math/k_tanf.c b/src/math/k_tanf.c
deleted file mode 100644 (file)
index 99ede58..0000000
--- a/src/math/k_tanf.c
+++ /dev/null
@@ -1,105 +0,0 @@
-/* k_tanf.c -- float version of k_tan.c
- * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
- */
-
-/*
- * ====================================================
- * Copyright 2004 Sun Microsystems, Inc.  All Rights Reserved.
- *
- * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice
- * is preserved.
- * ====================================================
- */
-
-#include <math.h>
-#include "math_private.h"
-static const float
-one   =  1.0000000000e+00, /* 0x3f800000 */
-pio4  =  7.8539812565e-01, /* 0x3f490fda */
-pio4lo=  3.7748947079e-08, /* 0x33222168 */
-T[] =  {
-  3.3333334327e-01, /* 0x3eaaaaab */
-  1.3333334029e-01, /* 0x3e088889 */
-  5.3968254477e-02, /* 0x3d5d0dd1 */
-  2.1869488060e-02, /* 0x3cb327a4 */
-  8.8632395491e-03, /* 0x3c11371f */
-  3.5920790397e-03, /* 0x3b6b6916 */
-  1.4562094584e-03, /* 0x3abede48 */
-  5.8804126456e-04, /* 0x3a1a26c8 */
-  2.4646313977e-04, /* 0x398137b9 */
-  7.8179444245e-05, /* 0x38a3f445 */
-  7.1407252108e-05, /* 0x3895c07a */
- -1.8558637748e-05, /* 0xb79bae5f */
-  2.5907305826e-05, /* 0x37d95384 */
-};
-
-float
-__kernel_tanf(float x, float y, int iy)
-{
-        float z,r,v,w,s;
-        int32_t ix,hx;
-        GET_FLOAT_WORD(hx,x);
-        ix = hx&0x7fffffff;     /* high word of |x| */
-        if(ix<0x31800000) {                     /* x < 2**-28 */
-                if ((int) x == 0) {             /* generate inexact */
-                        if ((ix | (iy + 1)) == 0)
-                                return one / fabsf(x);
-                        else {
-                                if (iy == 1)
-                                        return x;
-                                else {  /* compute -1 / (x+y) carefully */
-                                        double a, t;
-
-                                        z = w = x + y;
-                                        GET_FLOAT_WORD(ix, z);
-                                        SET_FLOAT_WORD(z, ix & 0xfffff000);
-                                        v = y - (z - x);
-                                        t = a = -one / w;
-                                        GET_FLOAT_WORD(ix, t);
-                                        SET_FLOAT_WORD(t, ix & 0xfffff000);
-                                        s = one + t * z;
-                                        return t + a * (s + t * v);
-                                }
-                        }
-                }
-        }
-        if(ix>=0x3f2ca140) {                    /* |x|>=0.6744 */
-            if(hx<0) {x = -x; y = -y;}
-            z = pio4-x;
-            w = pio4lo-y;
-            x = z+w; y = 0.0;
-        }
-        z       =  x*x;
-        w       =  z*z;
-    /* Break x^5*(T[1]+x^2*T[2]+...) into
-     *    x^5(T[1]+x^4*T[3]+...+x^20*T[11]) +
-     *    x^5(x^2*(T[2]+x^4*T[4]+...+x^22*[T12]))
-     */
-        r = T[1]+w*(T[3]+w*(T[5]+w*(T[7]+w*(T[9]+w*T[11]))));
-        v = z*(T[2]+w*(T[4]+w*(T[6]+w*(T[8]+w*(T[10]+w*T[12])))));
-        s = z*x;
-        r = y + z*(s*(r+v)+y);
-        r += T[0]*s;
-        w = x+r;
-        if(ix>=0x3f2ca140) {
-            v = (float)iy;
-            return (float)(1-((hx>>30)&2))*(v-(float)2.0*(x-(w*w/(w+v)-r)));
-        }
-        if(iy==1) return w;
-        else {          /* if allow error up to 2 ulp,
-                           simply return -1.0/(x+r) here */
-     /*  compute -1.0/(x+r) accurately */
-            float a,t;
-            int32_t i;
-            z  = w;
-            GET_FLOAT_WORD(i,z);
-            SET_FLOAT_WORD(z,i&0xfffff000);
-            v  = r-(z - x);     /* z+v = r+x */
-            t = a  = -(float)1.0/w;     /* a = -1.0/w */
-            GET_FLOAT_WORD(i,t);
-            SET_FLOAT_WORD(t,i&0xfffff000);
-            s  = (float)1.0+t*z;
-            return t+a*(s+t*v);
-        }
-}