--- /dev/null
+/* http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/tgmath.h.html */
+/*-
+ * Copyright (c) 2004 Stefan Farfeleder.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _TGMATH_H_
+#define _TGMATH_H_
+
+#include <complex.h>
+#include <math.h>
+
+#ifdef log2
+#undef log2
+#endif
+
+/*
+ * This implementation of <tgmath.h> requires two implementation-dependent
+ * macros to be defined:
+ * __tg_impl_simple(x, y, z, fn, fnf, fnl, ...)
+ * Invokes fnl() if the corresponding real type of x, y or z is long
+ * double, fn() if it is double or any has an integer type, and fnf()
+ * otherwise.
+ * __tg_impl_full(x, y, z, fn, fnf, fnl, cfn, cfnf, cfnl, ...)
+ * Invokes [c]fnl() if the corresponding real type of x, y or z is long
+ * double, [c]fn() if it is double or any has an integer type, and
+ * [c]fnf() otherwise. The function with the 'c' prefix is called if
+ * any of x, y or z is a complex number.
+ * Both macros call the chosen function with all additional arguments passed
+ * to them, as given by __VA_ARGS__.
+ *
+ * Note that these macros cannot be implemented with C's ?: operator,
+ * because the return type of the whole expression would incorrectly be long
+ * double complex regardless of the argument types.
+ */
+
+/* requires GCC >= 3.1 */
+#if !defined(__GNUC__) || __GNUC__ < 3 || \
+ (__GNUC__ == 3 && __GNUC_MINOR__ < 1)
+#error "<tgmath.h> not implemented for this compiler"
+#endif
+
+#define __tg_type(__e, __t) \
+ __builtin_types_compatible_p(__typeof__(__e), __t)
+#define __tg_type3(__e1, __e2, __e3, __t) \
+ (__tg_type(__e1, __t) || __tg_type(__e2, __t) || \
+ __tg_type(__e3, __t))
+#define __tg_type_corr(__e1, __e2, __e3, __t) \
+ (__tg_type3(__e1, __e2, __e3, __t) || \
+ __tg_type3(__e1, __e2, __e3, __t _Complex))
+#define __tg_integer(__e1, __e2, __e3) \
+ (((__typeof__(__e1))1.5 == 1) || ((__typeof__(__e2))1.5 == 1) || \
+ ((__typeof__(__e3))1.5 == 1))
+#define __tg_is_complex(__e1, __e2, __e3) \
+ (__tg_type3(__e1, __e2, __e3, float _Complex) || \
+ __tg_type3(__e1, __e2, __e3, double _Complex) || \
+ __tg_type3(__e1, __e2, __e3, long double _Complex) || \
+ __tg_type3(__e1, __e2, __e3, __typeof__(_Complex_I)))
+
+#ifdef _LDBL_EQ_DBL
+#define __tg_impl_simple(x, y, z, fn, fnf, fnl, ...) \
+ __builtin_choose_expr(__tg_type_corr(x, y, z, long double), \
+ fnl(__VA_ARGS__), __builtin_choose_expr( \
+ __tg_type_corr(x, y, z, double) || __tg_integer(x, y, z),\
+ fn(__VA_ARGS__), fnf(__VA_ARGS__)))
+#else
+#define __tg_impl_simple(__x, __y, __z, __fn, __fnf, __fnl, ...) \
+ (__tg_type_corr(__x, __y, __z, double) || __tg_integer(__x, __y, __z)) \
+ ? __fn(__VA_ARGS__) : __fnf(__VA_ARGS__)
+#endif
+
+#define __tg_impl_full(__x, __y, __z, __fn, __fnf, __fnl, __cfn, __cfnf, __cfnl, ...) \
+ __builtin_choose_expr(__tg_is_complex(__x, __y, __z), \
+ __tg_impl_simple(__x, __y, __z, __cfn, __cfnf, __cfnl, __VA_ARGS__), \
+ __tg_impl_simple(__x, __y, __z, __fn, __fnf, __fnl, __VA_ARGS__))
+
+/* Macros to save lots of repetition below */
+#define __tg_simple(__x, __fn) \
+ __tg_impl_simple(__x, __x, __x, __fn, __fn##f, __fn##l, __x)
+#define __tg_simple2(__x, __y, __fn) \
+ __tg_impl_simple(__x, __x, __y, __fn, __fn##f, __fn##l, __x, __y)
+#define __tg_simplev(__x, __fn, ...) \
+ __tg_impl_simple(__x, __x, __x, __fn, __fn##f, __fn##l, __VA_ARGS__)
+#define __tg_full(__x, __fn) \
+ __tg_impl_full(__x, __x, __x, __fn, __fn##f, __fn##l, c##__fn, c##__fn##f, c##__fn##l, __x)
+
+/* 7.22#4 -- These macros expand to real or complex functions, depending on
+ * the type of their arguments. */
+#define acos(__x) __tg_full(__x, acos)
+#define asin(__x) __tg_full(__x, asin)
+#define atan(__x) __tg_full(__x, atan)
+#define acosh(__x) __tg_full(__x, acosh)
+#define asinh(__x) __tg_full(__x, asinh)
+#define atanh(__x) __tg_full(__x, atanh)
+#define cos(__x) __tg_full(__x, cos)
+#define sin(__x) __tg_full(__x, sin)
+#define tan(__x) __tg_full(__x, tan)
+#define cosh(__x) __tg_full(__x, cosh)
+#define sinh(__x) __tg_full(__x, sinh)
+#define tanh(__x) __tg_full(__x, tanh)
+#define exp(__x) __tg_full(__x, exp)
+#define log(__x) __tg_full(__x, log)
+#define pow(__x, __y) __tg_impl_full(__x, __x, __y, pow, powf, powl, \
+ cpow, cpowf, cpowl, __x, __y)
+#define sqrt(__x) __tg_full(__x, sqrt)
+
+/* "The corresponding type-generic macro for fabs and cabs is fabs." */
+#define fabs(__x) __tg_impl_full(__x, __x, __x, fabs, fabsf, fabsl, \
+ cabs, cabsf, cabsl, __x)
+
+/* 7.22#5 -- These macros are only defined for arguments with real type. */
+#define atan2(__x, __y) __tg_simple2(__x, __y, atan2)
+#define cbrt(__x) __tg_simple(__x, cbrt)
+#define ceil(__x) __tg_simple(__x, ceil)
+#define copysign(__x, __y) __tg_simple2(__x, __y, copysign)
+#define erf(__x) __tg_simple(__x, erf)
+#define erfc(__x) __tg_simple(__x, erfc)
+#define exp2(__x) __tg_simple(__x, exp2)
+#define expm1(__x) __tg_simple(__x, expm1)
+#define fdim(__x, __y) __tg_simple2(__x, __y, fdim)
+#define floor(__x) __tg_simple(__x, floor)
+#define fma(__x, __y, __z) __tg_impl_simple(__x, __y, __z, fma, fmaf, fmal, \
+ __x, __y, __z)
+#define fmax(__x, __y) __tg_simple2(__x, __y, fmax)
+#define fmin(__x, __y) __tg_simple2(__x, __y, fmin)
+#define fmod(__x, __y) __tg_simple2(__x, __y, fmod)
+#define frexp(__x, __y) __tg_simplev(__x, frexp, __x, __y)
+#define hypot(__x, __y) __tg_simple2(__x, __y, hypot)
+#define ilogb(__x) __tg_simple(__x, ilogb)
+#define ldexp(__x, __y) __tg_simplev(__x, ldexp, __x, __y)
+#define lgamma(__x) __tg_simple(__x, lgamma)
+#define llrint(__x) __tg_simple(__x, llrint)
+#define llround(__x) __tg_simple(__x, llround)
+#define log10(__x) __tg_simple(__x, log10)
+#define log1p(__x) __tg_simple(__x, log1p)
+#define log2(__x) __tg_simple(__x, log2)
+#define logb(__x) __tg_simple(__x, logb)
+#define lrint(__x) __tg_simple(__x, lrint)
+#define lround(__x) __tg_simple(__x, lround)
+#define nearbyint(__x) __tg_simple(__x, nearbyint)
+#define nextafter(__x, __y) __tg_simple2(__x, __y, nextafter)
+/* not yet implemented even for _LDBL_EQ_DBL platforms
+#define nexttoward(__x, __y) __tg_simplev(__x, nexttoward, __x, __y)
+*/
+#define remainder(__x, __y) __tg_simple2(__x, __y, remainder)
+#define remquo(__x, __y, __z) __tg_impl_simple(__x, __x, __y, remquo, remquof, \
+ remquol, __x, __y, __z)
+#define rint(__x) __tg_simple(__x, rint)
+#define round(__x) __tg_simple(__x, round)
+#define scalbn(__x, __y) __tg_simplev(__x, scalbn, __x, __y)
+#define scalbln(__x, __y) __tg_simplev(__x, scalbln, __x, __y)
+#define tgamma(__x) __tg_simple(__x, tgamma)
+#define trunc(__x) __tg_simple(__x, trunc)
+
+/* 7.22#6 -- These macros always expand to complex functions. */
+#define carg(__x) __tg_simple(__x, carg)
+#define cimag(__x) __tg_simple(__x, cimag)
+#define conj(__x) __tg_simple(__x, conj)
+#define cproj(__x) __tg_simple(__x, cproj)
+#define creal(__x) __tg_simple(__x, creal)
+
+#endif /* !_TGMATH_H_ */
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