| 1 | /* s_asinhf.c -- float version of s_asinh.c. |
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| 2 | */ |
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| 3 | |
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| 4 | /* |
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| 5 | * ==================================================== |
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| 6 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 7 | * |
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| 8 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 9 | * Permission to use, copy, modify, and distribute this |
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| 10 | * software is freely granted, provided that this notice |
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| 11 | * is preserved. |
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| 12 | * ==================================================== |
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| 13 | */ |
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| 14 | |
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| 15 | #include <float.h> |
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| 16 | #include <math.h> |
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| 17 | #include <math_private.h> |
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| 18 | #include <math-underflow.h> |
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| 19 | #include <libm-alias-float.h> |
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| 20 | |
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| 21 | static const float |
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| 22 | one = 1.0000000000e+00, /* 0x3F800000 */ |
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| 23 | ln2 = 6.9314718246e-01, /* 0x3f317218 */ |
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| 24 | huge= 1.0000000000e+30; |
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| 25 | |
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| 26 | float |
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| 27 | __asinhf(float x) |
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| 28 | { |
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| 29 | float w; |
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| 30 | int32_t hx,ix; |
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| 31 | GET_FLOAT_WORD(hx,x); |
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| 32 | ix = hx&0x7fffffff; |
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| 33 | if(__builtin_expect(ix< 0x38000000, 0)) { /* |x|<2**-14 */ |
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| 34 | math_check_force_underflow (x); |
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| 35 | if(huge+x>one) return x; /* return x inexact except 0 */ |
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| 36 | } |
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| 37 | if(__builtin_expect(ix>0x47000000, 0)) { /* |x| > 2**14 */ |
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| 38 | if(ix>=0x7f800000) return x+x; /* x is inf or NaN */ |
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| 39 | w = __ieee754_logf(fabsf(x: x))+ln2; |
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| 40 | } else { |
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| 41 | float xa = fabsf(x: x); |
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| 42 | if (ix>0x40000000) { /* 2**14 > |x| > 2.0 */ |
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| 43 | w = __ieee754_logf(2.0f*xa+one/(sqrtf(xa*xa+one)+xa)); |
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| 44 | } else { /* 2.0 > |x| > 2**-14 */ |
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| 45 | float t = xa*xa; |
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| 46 | w =__log1pf(x: xa+t/(one+sqrtf(one+t))); |
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| 47 | } |
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| 48 | } |
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| 49 | return copysignf(w, x); |
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| 50 | } |
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| 51 | libm_alias_float (__asinh, asinh) |
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| 52 | |
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