1 //===-- absvti2.c - Implement __absvdi2 -----------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file implements __absvti2 for the compiler_rt library. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "int_lib.h" 14 15 #ifdef CRT_HAS_128BIT 16 17 // Returns: absolute value 18 19 // Effects: aborts if abs(x) < 0 20 21 COMPILER_RT_ABI ti_int __absvti2(ti_int a) { 22 const int N = (int)(sizeof(ti_int) * CHAR_BIT); 23 if (a == ((ti_int)1 << (N - 1))) 24 compilerrt_abort(); 25 const ti_int s = a >> (N - 1); 26 return (a ^ s) - s; 27 } 28 29 #endif // CRT_HAS_128BIT 30