diff options
Diffstat (limited to 'sysdeps/libm-ieee754/s_atanf.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_atanf.c | 120 |
1 files changed, 0 insertions, 120 deletions
diff --git a/sysdeps/libm-ieee754/s_atanf.c b/sysdeps/libm-ieee754/s_atanf.c deleted file mode 100644 index a68933fa6a..0000000000 --- a/sysdeps/libm-ieee754/s_atanf.c +++ /dev/null @@ -1,120 +0,0 @@ -/* s_atanf.c -- float version of s_atan.c. - * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. - */ - -/* - * ==================================================== - * 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. - * ==================================================== - */ - -#if defined(LIBM_SCCS) && !defined(lint) -static char rcsid[] = "$NetBSD: s_atanf.c,v 1.4 1995/05/10 20:46:47 jtc Exp $"; -#endif - -#include "math.h" -#include "math_private.h" - -#ifdef __STDC__ -static const float atanhi[] = { -#else -static float atanhi[] = { -#endif - 4.6364760399e-01, /* atan(0.5)hi 0x3eed6338 */ - 7.8539812565e-01, /* atan(1.0)hi 0x3f490fda */ - 9.8279368877e-01, /* atan(1.5)hi 0x3f7b985e */ - 1.5707962513e+00, /* atan(inf)hi 0x3fc90fda */ -}; - -#ifdef __STDC__ -static const float atanlo[] = { -#else -static float atanlo[] = { -#endif - 5.0121582440e-09, /* atan(0.5)lo 0x31ac3769 */ - 3.7748947079e-08, /* atan(1.0)lo 0x33222168 */ - 3.4473217170e-08, /* atan(1.5)lo 0x33140fb4 */ - 7.5497894159e-08, /* atan(inf)lo 0x33a22168 */ -}; - -#ifdef __STDC__ -static const float aT[] = { -#else -static float aT[] = { -#endif - 3.3333334327e-01, /* 0x3eaaaaaa */ - -2.0000000298e-01, /* 0xbe4ccccd */ - 1.4285714924e-01, /* 0x3e124925 */ - -1.1111110449e-01, /* 0xbde38e38 */ - 9.0908870101e-02, /* 0x3dba2e6e */ - -7.6918758452e-02, /* 0xbd9d8795 */ - 6.6610731184e-02, /* 0x3d886b35 */ - -5.8335702866e-02, /* 0xbd6ef16b */ - 4.9768779427e-02, /* 0x3d4bda59 */ - -3.6531571299e-02, /* 0xbd15a221 */ - 1.6285819933e-02, /* 0x3c8569d7 */ -}; - -#ifdef __STDC__ - static const float -#else - static float -#endif -one = 1.0, -huge = 1.0e30; - -#ifdef __STDC__ - float __atanf(float x) -#else - float __atanf(x) - float x; -#endif -{ - float w,s1,s2,z; - int32_t ix,hx,id; - - GET_FLOAT_WORD(hx,x); - ix = hx&0x7fffffff; - if(ix>=0x50800000) { /* if |x| >= 2^34 */ - if(ix>0x7f800000) - return x+x; /* NaN */ - if(hx>0) return atanhi[3]+atanlo[3]; - else return -atanhi[3]-atanlo[3]; - } if (ix < 0x3ee00000) { /* |x| < 0.4375 */ - if (ix < 0x31000000) { /* |x| < 2^-29 */ - if(huge+x>one) return x; /* raise inexact */ - } - id = -1; - } else { - x = fabsf(x); - if (ix < 0x3f980000) { /* |x| < 1.1875 */ - if (ix < 0x3f300000) { /* 7/16 <=|x|<11/16 */ - id = 0; x = ((float)2.0*x-one)/((float)2.0+x); - } else { /* 11/16<=|x|< 19/16 */ - id = 1; x = (x-one)/(x+one); - } - } else { - if (ix < 0x401c0000) { /* |x| < 2.4375 */ - id = 2; x = (x-(float)1.5)/(one+(float)1.5*x); - } else { /* 2.4375 <= |x| < 2^66 */ - id = 3; x = -(float)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; - } -} -weak_alias (__atanf, atanf) |