1d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol/* kf_cos.c -- float version of k_cos.c 2d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 3d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol */ 4d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol 5d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol/* 6d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol * ==================================================== 7d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 8d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol * 9d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol * Developed at SunPro, a Sun Microsystems, Inc. business. 10d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol * Permission to use, copy, modify, and distribute this 11d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol * software is freely granted, provided that this notice 12d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol * is preserved. 13d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol * ==================================================== 14d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol */ 15d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol 16d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol#include "fdlibm.h" 17d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol 18d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol#ifdef __STDC__ 19d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignolstatic const float 20d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol#else 21d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignolstatic float 22d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol#endif 23d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignolone = 1.0000000000e+00, /* 0x3f800000 */ 24d61f9ebd0671c1066118199537cd6057ecbf8697Andrew RossignolC1 = 4.1666667908e-02, /* 0x3d2aaaab */ 25d61f9ebd0671c1066118199537cd6057ecbf8697Andrew RossignolC2 = -1.3888889225e-03, /* 0xbab60b61 */ 26d61f9ebd0671c1066118199537cd6057ecbf8697Andrew RossignolC3 = 2.4801587642e-05, /* 0x37d00d01 */ 27d61f9ebd0671c1066118199537cd6057ecbf8697Andrew RossignolC4 = -2.7557314297e-07, /* 0xb493f27c */ 28d61f9ebd0671c1066118199537cd6057ecbf8697Andrew RossignolC5 = 2.0875723372e-09, /* 0x310f74f6 */ 29d61f9ebd0671c1066118199537cd6057ecbf8697Andrew RossignolC6 = -1.1359647598e-11; /* 0xad47d74e */ 30d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol 31d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol#ifdef __STDC__ 32d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol float __kernel_cosf(float x, float y) 33d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol#else 34d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol float __kernel_cosf(x, y) 35d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol float x,y; 36d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol#endif 37d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol{ 38d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol float a,hz,z,r,qx; 39d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol __int32_t ix; 40d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol GET_FLOAT_WORD(ix,x); 41d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol ix &= 0x7fffffff; /* ix = |x|'s high word*/ 42d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol if(ix<0x32000000) { /* if x < 2**27 */ 43d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol if(((int)x)==0) return one; /* generate inexact */ 44d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol } 45d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol z = x*x; 46d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol r = z*(C1+z*(C2+z*(C3+z*(C4+z*(C5+z*C6))))); 47d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol if(ix < 0x3e99999a) /* if |x| < 0.3 */ 48d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol return one - ((float)0.5*z - (z*r - x*y)); 49d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol else { 50d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol if(ix > 0x3f480000) { /* x > 0.78125 */ 51d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol qx = (float)0.28125; 52d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol } else { 53d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol SET_FLOAT_WORD(qx,ix-0x01000000); /* x/4 */ 54d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol } 55d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol hz = (float)0.5*z-qx; 56d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol a = one-qx; 57d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol return a - (hz - (z*r-x*y)); 58d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol } 59d61f9ebd0671c1066118199537cd6057ecbf8697Andrew Rossignol} 60