| 1 | /* Complex sine function. m68k fpu version |
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| 2 | Copyright (C) 1997-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library. If not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <complex.h> |
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| 20 | #include <math.h> |
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| 21 | #include "mathimpl.h" |
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| 22 | |
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| 23 | #define s(name) M_SUF (name) |
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| 24 | #define m81(func) __m81_u(s(func)) |
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| 25 | |
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| 26 | CFLOAT |
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| 27 | s(__csin) (CFLOAT x) |
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| 28 | { |
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| 29 | CFLOAT retval; |
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| 30 | unsigned long rx_cond = __m81_test (val: __real__ x); |
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| 31 | |
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| 32 | if ((rx_cond & (__M81_COND_INF|__M81_COND_NAN)) == 0) |
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| 33 | { |
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| 34 | /* Real part is finite. */ |
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| 35 | FLOAT sin_rx, cos_rx; |
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| 36 | |
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| 37 | __asm ("fsincos%.x %2,%1:%0" : "=f" (sin_rx), "=f" (cos_rx) |
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| 38 | : "f" (__real__ x)); |
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| 39 | if (rx_cond & __M81_COND_ZERO) |
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| 40 | __real__ retval = __real__ x; |
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| 41 | else |
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| 42 | __real__ retval = sin_rx * m81(__ieee754_cosh) (__imag__ x); |
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| 43 | __imag__ retval = cos_rx * m81(__ieee754_sinh) (__imag__ x); |
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| 44 | } |
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| 45 | else |
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| 46 | { |
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| 47 | unsigned long ix_cond = __m81_test (val: __imag__ x); |
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| 48 | |
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| 49 | __real__ retval = __real__ x - __real__ x; |
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| 50 | if (ix_cond & (__M81_COND_ZERO|__M81_COND_INF|__M81_COND_NAN)) |
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| 51 | __imag__ retval = __imag__ x; |
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| 52 | else |
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| 53 | __imag__ retval = __real__ retval; |
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| 54 | } |
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| 55 | |
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| 56 | return retval; |
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| 57 | } |
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| 58 | declare_mgen_alias (__csin, csin) |
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| 59 | |
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