first commit of the new libm!

[musl] / src / math / s_sin.c

diff --git a/src/math/s_sin.c b/src/math/s_sin.c
deleted file mode 100644 (file)
index 2a2774e..0000000
--- a/src/math/s_sin.c
+++ /dev/null
@@ -1,74 +0,0 @@
-/* @(#)s_sin.c 5.1 93/09/24 */
-/*
- * ====================================================
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
- *
- * Developed at SunPro, a Sun Microsystems, Inc. business.
- * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice
- * is preserved.
- * ====================================================
- */
-
-/* sin(x)
- * Return sine function of x.
- *
- * kernel function:
- *      __kernel_sin            ... sine function on [-pi/4,pi/4]
- *      __kernel_cos            ... cose function on [-pi/4,pi/4]
- *      __ieee754_rem_pio2      ... argument reduction routine
- *
- * Method.
- *      Let S,C and T denote the sin, cos and tan respectively on
- *      [-PI/4, +PI/4]. Reduce the argument x to y1+y2 = x-k*pi/2
- *      in [-pi/4 , +pi/4], and let n = k mod 4.
- *      We have
- *
- *          n        sin(x)      cos(x)        tan(x)
- *     ----------------------------------------------------------
- *          0          S           C             T
- *          1          C          -S            -1/T
- *          2         -S          -C             T
- *          3         -C           S            -1/T
- *     ----------------------------------------------------------
- *
- * Special cases:
- *      Let trig be any of sin, cos, or tan.
- *      trig(+-INF)  is NaN, with signals;
- *      trig(NaN)    is that NaN;
- *
- * Accuracy:
- *      TRIG(x) returns trig(x) nearly rounded
- */
-
-#include <math.h>
-#include "math_private.h"
-
-double
-sin(double x)
-{
-        double y[2],z=0.0;
-        int32_t n, ix;
-
-    /* High word of x. */
-        GET_HIGH_WORD(ix,x);
-
-    /* |x| ~< pi/4 */
-        ix &= 0x7fffffff;
-        if(ix <= 0x3fe921fb) return __kernel_sin(x,z,0);
-
-    /* sin(Inf or NaN) is NaN */
-        else if (ix>=0x7ff00000) return x-x;
-
-    /* argument reduction needed */
-        else {
-            n = __ieee754_rem_pio2(x,y);
-            switch(n&3) {
-                case 0: return  __kernel_sin(y[0],y[1],1);
-                case 1: return  __kernel_cos(y[0],y[1]);
-                case 2: return -__kernel_sin(y[0],y[1],1);
-                default:
-                        return -__kernel_cos(y[0],y[1]);
-            }
-        }
-}