diff options
Diffstat (limited to 'ports/sysdeps/m68k/m680x0/fpu/s_cexp.c')
| -rw-r--r-- | ports/sysdeps/m68k/m680x0/fpu/s_cexp.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/ports/sysdeps/m68k/m680x0/fpu/s_cexp.c b/ports/sysdeps/m68k/m680x0/fpu/s_cexp.c new file mode 100644 index 0000000000..c2a9f1d22e --- /dev/null +++ b/ports/sysdeps/m68k/m680x0/fpu/s_cexp.c @@ -0,0 +1,137 @@ +/* Complex exponential function. m68k fpu version + Copyright (C) 1997, 1999 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + <http://www.gnu.org/licenses/>. */ + +#include <float.h> +#include <complex.h> +#include <math.h> +#include "mathimpl.h" + +#ifndef SUFF +#define SUFF +#endif +#ifndef float_type +#define float_type double +#endif + +#define CONCATX(a,b) __CONCAT(a,b) +#define s(name) CONCATX(name,SUFF) +#define m81(func) __m81_u(s(func)) + +__complex__ float_type +s(__cexp) (__complex__ float_type x) +{ + __complex__ float_type retval; + unsigned long ix_cond; + + ix_cond = __m81_test (__imag__ x); + + if ((ix_cond & (__M81_COND_NAN|__M81_COND_INF)) == 0) + { + /* Imaginary part is finite. */ + unsigned long rx_cond = __m81_test (__real__ x); + + if ((rx_cond & (__M81_COND_NAN|__M81_COND_INF)) == 0) + { + const int t = (int) ((LDBL_MAX_EXP - 1) * M_LN2l); + long double sin_ix, cos_ix, exp_val; + + __m81_u (__sincosl) (__imag__ x, &sin_ix, &cos_ix); + + if (__real__ x > t) + { + long double exp_t = __m81_u(__ieee754_expl) (t); + __real__ x -= t; + sin_ix *= exp_t; + cos_ix *= exp_t; + if (__real__ x > t) + { + __real__ x -= t; + sin_ix *= exp_t; + cos_ix *= exp_t; + } + } + + exp_val = __m81_u(__ieee754_expl) (__real__ x); + __real__ retval = exp_val * cos_ix; + if (ix_cond & __M81_COND_ZERO) + __imag__ retval = __imag__ x; + else + __imag__ retval = exp_val * sin_ix; + } + else + { + /* Compute the sign of the result. */ + long double remainder, pi_2; + int quadrant; + + if ((rx_cond & (__M81_COND_NAN|__M81_COND_NEG)) == __M81_COND_NEG) + __real__ retval = __imag__ retval = 0.0; + else + __real__ retval = __imag__ retval = __real__ x; + __asm ("fmovecr %#0,%0\n\tfscale%.w %#-1,%0" : "=f" (pi_2)); + __asm ("fmod%.x %2,%0\n\tfmove%.l %/fpsr,%1" + : "=f" (remainder), "=dm" (quadrant) + : "f" (pi_2), "0" (__imag__ x)); + quadrant = (quadrant >> 16) & 0x83; + if (quadrant & 0x80) + quadrant ^= 0x83; + switch (quadrant) + { + default: + break; + case 1: + __real__ retval = -__real__ retval; + break; + case 2: + __real__ retval = -__real__ retval; + case 3: + __imag__ retval = -__imag__ retval; + break; + } + if (ix_cond & __M81_COND_ZERO && (rx_cond & __M81_COND_NAN) == 0) + __imag__ retval = __imag__ x; + } + } + else + { + unsigned long rx_cond = __m81_test (__real__ x); + + if (rx_cond & __M81_COND_INF) + { + /* Real part is infinite. */ + if (rx_cond & __M81_COND_NEG) + { + __real__ retval = __imag__ retval = 0.0; + if (ix_cond & __M81_COND_NEG) + __imag__ retval = -__imag__ retval; + } + else + { + __real__ retval = __real__ x; + __imag__ retval = __imag__ x - __imag__ x; + } + } + else + __real__ retval = __imag__ retval = __imag__ x - __imag__ x; + } + + return retval; +} +#define weak_aliasx(a,b) weak_alias(a,b) +weak_aliasx (s(__cexp), s(cexp)) |