1 /* ===-- absvti2.c - Implement __absvdi2 -----------------------------------=== 2 * 3 * The LLVM Compiler Infrastructure 4 * 5 * This file is dual licensed under the MIT and the University of Illinois Open 6 * Source Licenses. See LICENSE.TXT for details. 7 * 8 * ===----------------------------------------------------------------------=== 9 * 10 * This file implements __absvti2 for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14 15 #include "int_lib.h" 16 17 #ifdef CRT_HAS_128BIT 18 19 /* Returns: absolute value */ 20 21 /* Effects: aborts if abs(x) < 0 */ 22 23 COMPILER_RT_ABI ti_int 24 __absvti2(ti_int a) 25 { 26 const int N = (int)(sizeof(ti_int) * CHAR_BIT); 27 if (a == ((ti_int)1 << (N-1))) 28 compilerrt_abort(); 29 const ti_int s = a >> (N - 1); 30 return (a ^ s) - s; 31 } 32 33 #endif /* CRT_HAS_128BIT */ 34 35
