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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4973 | right-hear | 1 | /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */ |
| 2 | /* s_asinhf.c -- float version of s_asinh.c. |
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| 3 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
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| 4 | */ |
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| 5 | |||
| 6 | /* |
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| 7 | * ==================================================== |
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| 8 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 9 | * |
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| 10 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 11 | * Permission to use, copy, modify, and distribute this |
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| 12 | * software is freely granted, provided that this notice |
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| 13 | * is preserved. |
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| 14 | * ==================================================== |
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| 15 | */ |
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| 16 | |||
| 17 | #if defined(LIBM_SCCS) && !defined(lint) |
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| 18 | static char rcsid[] = "$Id: s_asinhf.c,v 1.2 1994/08/18 23:06:21 jtc Exp $"; |
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| 19 | #endif |
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| 20 | |||
| 21 | #include "math.h" |
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| 22 | #include "math_private.h" |
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| 23 | |||
| 24 | #ifdef __STDC__ |
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| 25 | static const float |
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| 26 | #else |
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| 27 | static float |
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| 28 | #endif |
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| 29 | one = 1.0000000000e+00, /* 0x3F800000 */ |
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| 30 | ln2 = 6.9314718246e-01, /* 0x3f317218 */ |
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| 31 | huge= 1.0000000000e+30; |
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| 32 | |||
| 33 | #ifdef __STDC__ |
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| 34 | float asinhf(float x) |
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| 35 | #else |
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| 36 | float asinhf(x) |
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| 37 | float x; |
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| 38 | #endif |
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| 39 | { |
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| 40 | float t,w; |
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| 41 | int32_t hx,ix; |
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| 42 | GET_FLOAT_WORD(hx,x); |
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| 43 | ix = hx&0x7fffffff; |
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| 44 | if(ix>=0x7f800000) return x+x; /* x is inf or NaN */ |
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| 45 | if(ix< 0x31800000) { /* |x|<2**-28 */ |
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| 46 | if(huge+x>one) return x; /* return x inexact except 0 */ |
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| 47 | } |
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| 48 | if(ix>0x4d800000) { /* |x| > 2**28 */ |
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| 49 | w = __ieee754_logf(fabsf(x))+ln2; |
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| 50 | } else if (ix>0x40000000) { /* 2**28 > |x| > 2.0 */ |
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| 51 | t = fabsf(x); |
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| 52 | w = __ieee754_logf((float)2.0*t+one/(sqrtf(x*x+one)+t)); |
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| 53 | } else { /* 2.0 > |x| > 2**-28 */ |
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| 54 | t = x*x; |
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| 55 | w =log1pf(fabsf(x)+t/(one+sqrtf(one+t))); |
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| 56 | } |
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| 57 | if(hx>0) return w; else return -w; |
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| 58 | } |