first commit of the new libm!

[musl] / src / math / k_sin.c

diff --git a/src/math/k_sin.c b/src/math/k_sin.c
deleted file mode 100644 (file)
index 9def258..0000000
--- a/src/math/k_sin.c
+++ /dev/null
@@ -1,68 +0,0 @@
-
-/* @(#)k_sin.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.
- * ====================================================
- */
-
-/* __kernel_sin( x, y, iy)
- * kernel sin function on [-pi/4, pi/4], pi/4 ~ 0.7854
- * Input x is assumed to be bounded by ~pi/4 in magnitude.
- * Input y is the tail of x.
- * Input iy indicates whether y is 0. (if iy=0, y assume to be 0). 
- *
- * Algorithm
- *      1. Since sin(-x) = -sin(x), we need only to consider positive x. 
- *      2. if x < 2^-27 (hx<0x3e400000 0), return x with inexact if x!=0.
- *      3. sin(x) is approximated by a polynomial of degree 13 on
- *         [0,pi/4]
- *                               3            13
- *              sin(x) ~ x + S1*x + ... + S6*x
- *         where
- *      
- *      |sin(x)         2     4     6     8     10     12  |     -58
- *      |----- - (1+S1*x +S2*x +S3*x +S4*x +S5*x  +S6*x   )| <= 2
- *      |  x                                               | 
- * 
- *      4. sin(x+y) = sin(x) + sin'(x')*y
- *                  ~ sin(x) + (1-x*x/2)*y
- *         For better accuracy, let 
- *                   3      2      2      2      2
- *              r = x *(S2+x *(S3+x *(S4+x *(S5+x *S6))))
- *         then                   3    2
- *              sin(x) = x + (S1*x + (x *(r-y/2)+y))
- */
-
-#include <math.h>
-#include "math_private.h"
-
-static const double
-half =  5.00000000000000000000e-01, /* 0x3FE00000, 0x00000000 */
-S1  = -1.66666666666666324348e-01, /* 0xBFC55555, 0x55555549 */
-S2  =  8.33333333332248946124e-03, /* 0x3F811111, 0x1110F8A6 */
-S3  = -1.98412698298579493134e-04, /* 0xBF2A01A0, 0x19C161D5 */
-S4  =  2.75573137070700676789e-06, /* 0x3EC71DE3, 0x57B1FE7D */
-S5  = -2.50507602534068634195e-08, /* 0xBE5AE5E6, 0x8A2B9CEB */
-S6  =  1.58969099521155010221e-10; /* 0x3DE5D93A, 0x5ACFD57C */
-
-double
-__kernel_sin(double x, double y, int iy)
-{
-        double z,r,v;
-        int32_t ix;
-        GET_HIGH_WORD(ix,x);
-        ix &= 0x7fffffff;                       /* high word of x */
-        if(ix<0x3e400000)                       /* |x| < 2**-27 */
-           {if((int)x==0) return x;}            /* generate inexact */
-        z       =  x*x;
-        v       =  z*x;
-        r       =  S2+z*(S3+z*(S4+z*(S5+z*S6)));
-        if(iy==0) return x+v*(S1+z*r);
-        else      return x-((z*(half*y-v*r)-y)-v*S1);
-}