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Diffstat (limited to 'REORG.TODO/math/s_csin_template.c')
| -rw-r--r-- | REORG.TODO/math/s_csin_template.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/REORG.TODO/math/s_csin_template.c b/REORG.TODO/math/s_csin_template.c new file mode 100644 index 0000000000..d52beb999b --- /dev/null +++ b/REORG.TODO/math/s_csin_template.c @@ -0,0 +1,165 @@ +/* Complex sine function for float types. + Copyright (C) 1997-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + 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 <complex.h> +#include <fenv.h> +#include <math.h> +#include <math_private.h> +#include <float.h> + +CFLOAT +M_DECL_FUNC (__csin) (CFLOAT x) +{ + CFLOAT retval; + int negate = signbit (__real__ x); + int rcls = fpclassify (__real__ x); + int icls = fpclassify (__imag__ x); + + __real__ x = M_FABS (__real__ x); + + if (__glibc_likely (icls >= FP_ZERO)) + { + /* Imaginary part is finite. */ + if (__glibc_likely (rcls >= FP_ZERO)) + { + /* Real part is finite. */ + const int t = (int) ((M_MAX_EXP - 1) * M_MLIT (M_LN2)); + FLOAT sinix, cosix; + + if (__glibc_likely (__real__ x > M_MIN)) + { + M_SINCOS (__real__ x, &sinix, &cosix); + } + else + { + sinix = __real__ x; + cosix = 1; + } + + if (negate) + sinix = -sinix; + + if (M_FABS (__imag__ x) > t) + { + FLOAT exp_t = M_EXP (t); + FLOAT ix = M_FABS (__imag__ x); + if (signbit (__imag__ x)) + cosix = -cosix; + ix -= t; + sinix *= exp_t / 2; + cosix *= exp_t / 2; + if (ix > t) + { + ix -= t; + sinix *= exp_t; + cosix *= exp_t; + } + if (ix > t) + { + /* Overflow (original imaginary part of x > 3t). */ + __real__ retval = M_MAX * sinix; + __imag__ retval = M_MAX * cosix; + } + else + { + FLOAT exp_val = M_EXP (ix); + __real__ retval = exp_val * sinix; + __imag__ retval = exp_val * cosix; + } + } + else + { + __real__ retval = M_COSH (__imag__ x) * sinix; + __imag__ retval = M_SINH (__imag__ x) * cosix; + } + + math_check_force_underflow_complex (retval); + } + else + { + if (icls == FP_ZERO) + { + /* Imaginary part is 0.0. */ + __real__ retval = __real__ x - __real__ x; + __imag__ retval = __imag__ x; + } + else + { + __real__ retval = M_NAN; + __imag__ retval = M_NAN; + + feraiseexcept (FE_INVALID); + } + } + } + else if (icls == FP_INFINITE) + { + /* Imaginary part is infinite. */ + if (rcls == FP_ZERO) + { + /* Real part is 0.0. */ + __real__ retval = M_COPYSIGN (0, negate ? -1 : 1); + __imag__ retval = __imag__ x; + } + else if (rcls > FP_ZERO) + { + /* Real part is finite. */ + FLOAT sinix, cosix; + + if (__glibc_likely (__real__ x > M_MIN)) + { + M_SINCOS (__real__ x, &sinix, &cosix); + } + else + { + sinix = __real__ x; + cosix = 1; + } + + __real__ retval = M_COPYSIGN (M_HUGE_VAL, sinix); + __imag__ retval = M_COPYSIGN (M_HUGE_VAL, cosix); + + if (negate) + __real__ retval = -__real__ retval; + if (signbit (__imag__ x)) + __imag__ retval = -__imag__ retval; + } + else + { + __real__ retval = __real__ x - __real__ x; + __imag__ retval = M_HUGE_VAL; + } + } + else + { + if (rcls == FP_ZERO) + __real__ retval = M_COPYSIGN (0, negate ? -1 : 1); + else + __real__ retval = M_NAN; + __imag__ retval = M_NAN; + } + + return retval; +} + +declare_mgen_alias (__csin, csin) + +#if M_LIBM_NEED_COMPAT (csin) +declare_mgen_libm_compat (__csin, csin) +#endif |