/* * Copyright (c) 2018 Jaroslav Jindrak * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - 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. * - The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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. */ #ifndef LIBCPP_BITS_BUILTINS #define LIBCPP_BITS_BUILTINS /** * Note: While the primary target of libcpp is the * g++ compiler, using builtin functions that would * unnecessarily limit the library to any specific * compiler is discouraged and as such all the used * builtins should be available atleast in g++ and * clang++. * GCC: https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html * LLVM: https://github.com/llvm-mirror/clang/blob/master/include/clang/Basic/Builtins.def * (If anyone has a better link for LLVM, feel free to update it.) */ #include <cstdlib> namespace std::aux { template<class T> constexpr double log2(T val) { return __builtin_log2(static_cast<double>(val)); } template<class T> constexpr double pow2(T exp) { return __builtin_pow(2.0, static_cast<double>(exp)); } template<class T> constexpr size_t pow2u(T exp) { return static_cast<size_t>(pow2(exp)); } template<class T, class U> constexpr T pow(T base, U exp) { return static_cast<T>( __builtin_pow(static_cast<double>(base), static_cast<double>(exp)) ); } template<class T> constexpr size_t ceil(T val) { return static_cast<size_t>(__builtin_ceil(static_cast<double>(val))); } template<class T> constexpr size_t floor(T val) { return static_cast<size_t>(__builtin_floor(static_cast<double>(val))); } } #endif