| 1 | /* Return arc hyperbole sine for float value. |
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| 2 | Copyright (C) 1997 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. |
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| 5 | |
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| 6 | The GNU C Library is free software; you can redistribute it and/or |
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| 7 | modify it under the terms of the GNU Lesser General Public |
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| 8 | License as published by the Free Software Foundation; either |
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| 9 | version 2.1 of the License, or (at your option) any later version. |
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| 10 | |
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| 11 | The GNU C Library is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | Lesser General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU Lesser General Public |
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| 17 | License along with the GNU C Library; if not, write to the Free |
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| 18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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| 19 | 02111-1307 USA. */ |
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| 20 | |
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| 21 | #include <complex.h> |
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| 22 | #include <math.h> |
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| 23 | #include "math_private.h" |
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| 24 | |
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| 25 | __complex__ float |
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| 26 | __casinhf (__complex__ float x) |
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| 27 | { |
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| 28 | __complex__ float res; |
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| 29 | int rcls = fpclassify (__real__ x); |
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| 30 | int icls = fpclassify (__imag__ x); |
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| 31 | |
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| 32 | if (rcls <= FP_INFINITE || icls <= FP_INFINITE) |
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| 33 | { |
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| 34 | if (icls == FP_INFINITE) |
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| 35 | { |
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| 36 | __real__ res = __copysignf (HUGE_VALF, __real__ x); |
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| 37 | |
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| 38 | if (rcls == FP_NAN) |
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| 39 | __imag__ res = __nanf (""); |
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| 40 | else |
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| 41 | __imag__ res = __copysignf (rcls >= FP_ZERO ? M_PI_2 : M_PI_4, |
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| 42 | __imag__ x); |
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| 43 | } |
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| 44 | else if (rcls <= FP_INFINITE) |
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| 45 | { |
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| 46 | __real__ res = __real__ x; |
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| 47 | if ((rcls == FP_INFINITE && icls >= FP_ZERO) |
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| 48 | || (rcls == FP_NAN && icls == FP_ZERO)) |
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| 49 | __imag__ res = __copysignf (0.0, __imag__ x); |
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| 50 | else |
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| 51 | __imag__ res = __nanf (""); |
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| 52 | } |
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| 53 | else |
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| 54 | { |
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| 55 | __real__ res = __nanf (""); |
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| 56 | __imag__ res = __nanf (""); |
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| 57 | } |
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| 58 | } |
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| 59 | else if (rcls == FP_ZERO && icls == FP_ZERO) |
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| 60 | { |
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| 61 | res = x; |
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| 62 | } |
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| 63 | else |
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| 64 | { |
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| 65 | __complex__ float y; |
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| 66 | |
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| 67 | __real__ y = (__real__ x - __imag__ x) * (__real__ x + __imag__ x) + 1.0; |
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| 68 | __imag__ y = 2.0 * __real__ x * __imag__ x; |
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| 69 | |
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| 70 | y = __csqrtf (y); |
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| 71 | |
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| 72 | __real__ y += __real__ x; |
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| 73 | __imag__ y += __imag__ x; |
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| 74 | |
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| 75 | res = __clogf (y); |
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| 76 | } |
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| 77 | |
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| 78 | return res; |
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| 79 | } |
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| 80 | weak_alias (__casinhf, casinhf) |
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