abs.c (1164B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 #include "stdlib/math/base/special/abs.h" 20 #include "stdlib/number/float64/base/to_words.h" 21 22 // 0x7fffffff = 2147483647 => 0 11111111111 11111111111111111111 23 static const uint32_t ABS_MASK = 2147483647; 24 25 /** 26 * Computes the absolute value of a double-precision floating-point number. 27 * 28 * @param x number 29 * @return absolute value 30 * 31 * @example 32 * double y = stdlib_base_abs( -5.0 ); 33 * // returns 5.0 34 */ 35 double stdlib_base_abs( const double x ) { 36 stdlib_base_float64_words_t w; 37 w.value = x; 38 w.words.high &= ABS_MASK; 39 return w.value; 40 }