X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=StdLib%2FLibC%2FMath%2Fs_atan.c;fp=StdLib%2FLibC%2FMath%2Fs_atan.c;h=0000000000000000000000000000000000000000;hp=cbaf359936045a40c823020ec8ce2e7f7a6baa92;hb=964f432b9b0afe103c41c7613fade3e699118afe;hpb=e2d3a25f1a3135221a9c8061e1b8f90245d727eb

diff --git a/StdLib/LibC/Math/s_atan.c b/StdLib/LibC/Math/s_atan.c
deleted file mode 100644
index cbaf359936..0000000000
--- a/StdLib/LibC/Math/s_atan.c
+++ /dev/null
@@ -1,120 +0,0 @@
-/* @(#)s_atan.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.
- * ====================================================
- */
-#include  <LibConfig.h>
-#include  <sys/EfiCdefs.h>
-#if defined(LIBM_SCCS) && !defined(lint)
-__RCSID("$NetBSD: s_atan.c,v 1.11 2002/05/26 22:01:54 wiz Exp $");
-#endif
-
-/* atan(x)
- * Method
- *   1. Reduce x to positive by atan(x) = -atan(-x).
- *   2. According to the integer k=4t+0.25 chopped, t=x, the argument
- *      is further reduced to one of the following intervals and the
- *      arctangent of t is evaluated by the corresponding formula:
- *
- *      [0,7/16]      atan(x) = t-t^3*(a1+t^2*(a2+...(a10+t^2*a11)...)
- *      [7/16,11/16]  atan(x) = atan(1/2) + atan( (t-0.5)/(1+t/2) )
- *      [11/16.19/16] atan(x) = atan( 1 ) + atan( (t-1)/(1+t) )
- *      [19/16,39/16] atan(x) = atan(3/2) + atan( (t-1.5)/(1+1.5t) )
- *      [39/16,INF]   atan(x) = atan(INF) + atan( -1/t )
- *
- * Constants:
- * The hexadecimal values are the intended ones for the following
- * constants. The decimal values may be used, provided that the
- * compiler will convert from decimal to binary accurately enough
- * to produce the hexadecimal values shown.
- */
-
-#include "math.h"
-#include "math_private.h"
-
-static const double atanhi[] = {
-  4.63647609000806093515e-01, /* atan(0.5)hi 0x3FDDAC67, 0x0561BB4F */
-  7.85398163397448278999e-01, /* atan(1.0)hi 0x3FE921FB, 0x54442D18 */
-  9.82793723247329054082e-01, /* atan(1.5)hi 0x3FEF730B, 0xD281F69B */
-  1.57079632679489655800e+00, /* atan(inf)hi 0x3FF921FB, 0x54442D18 */
-};
-
-static const double atanlo[] = {
-  2.26987774529616870924e-17, /* atan(0.5)lo 0x3C7A2B7F, 0x222F65E2 */
-  3.06161699786838301793e-17, /* atan(1.0)lo 0x3C81A626, 0x33145C07 */
-  1.39033110312309984516e-17, /* atan(1.5)lo 0x3C700788, 0x7AF0CBBD */
-  6.12323399573676603587e-17, /* atan(inf)lo 0x3C91A626, 0x33145C07 */
-};
-
-static const double aT[] = {
-  3.33333333333329318027e-01, /* 0x3FD55555, 0x5555550D */
- -1.99999999998764832476e-01, /* 0xBFC99999, 0x9998EBC4 */
-  1.42857142725034663711e-01, /* 0x3FC24924, 0x920083FF */
- -1.11111104054623557880e-01, /* 0xBFBC71C6, 0xFE231671 */
-  9.09088713343650656196e-02, /* 0x3FB745CD, 0xC54C206E */
- -7.69187620504482999495e-02, /* 0xBFB3B0F2, 0xAF749A6D */
-  6.66107313738753120669e-02, /* 0x3FB10D66, 0xA0D03D51 */
- -5.83357013379057348645e-02, /* 0xBFADDE2D, 0x52DEFD9A */
-  4.97687799461593236017e-02, /* 0x3FA97B4B, 0x24760DEB */
- -3.65315727442169155270e-02, /* 0xBFA2B444, 0x2C6A6C2F */
-  1.62858201153657823623e-02, /* 0x3F90AD3A, 0xE322DA11 */
-};
-
-  static const double
-one   = 1.0,
-huge   = 1.0e300;
-
-double
-atan(double x)
-{
-  double w,s1,s2,z;
-  int32_t ix,hx,id;
-
-  GET_HIGH_WORD(hx,x);
-  ix = hx&0x7fffffff;
-  if(ix>=0x44100000) {  /* if |x| >= 2^66 */
-      u_int32_t low;
-      GET_LOW_WORD(low,x);
-      if(ix>0x7ff00000||
-    (ix==0x7ff00000&&(low!=0)))
-    return x+x;   /* NaN */
-      if(hx>0) return  atanhi[3]+atanlo[3];
-      else     return -atanhi[3]-atanlo[3];
-  } if (ix < 0x3fdc0000) {  /* |x| < 0.4375 */
-      if (ix < 0x3e200000) {  /* |x| < 2^-29 */
-    if(huge+x>one) return x;  /* raise inexact */
-      }
-      id = -1;
-  } else {
-  x = fabs(x);
-  if (ix < 0x3ff30000) {    /* |x| < 1.1875 */
-      if (ix < 0x3fe60000) {  /* 7/16 <=|x|<11/16 */
-    id = 0; x = (2.0*x-one)/(2.0+x);
-      } else {      /* 11/16<=|x|< 19/16 */
-    id = 1; x  = (x-one)/(x+one);
-      }
-  } else {
-      if (ix < 0x40038000) {  /* |x| < 2.4375 */
-    id = 2; x  = (x-1.5)/(one+1.5*x);
-      } else {      /* 2.4375 <= |x| < 2^66 */
-    id = 3; x  = -1.0/x;
-      }
-  }}
-    /* end of argument reduction */
-  z = x*x;
-  w = z*z;
-    /* break sum from i=0 to 10 aT[i]z**(i+1) into odd and even poly */
-  s1 = z*(aT[0]+w*(aT[2]+w*(aT[4]+w*(aT[6]+w*(aT[8]+w*aT[10])))));
-  s2 = w*(aT[1]+w*(aT[3]+w*(aT[5]+w*(aT[7]+w*aT[9]))));
-  if (id<0) return x - x*(s1+s2);
-  else {
-      z = atanhi[id] - ((x*(s1+s2) - atanlo[id]) - x);
-      return (hx<0)? -z:z;
-  }
-}