absvti2.c revision 276789
1276789Sdim/* ===-- absvti2.c - Implement __absvdi2 -----------------------------------=== 2276789Sdim * 3276789Sdim * The LLVM Compiler Infrastructure 4276789Sdim * 5276789Sdim * This file is dual licensed under the MIT and the University of Illinois Open 6276789Sdim * Source Licenses. See LICENSE.TXT for details. 7276789Sdim * 8276789Sdim * ===----------------------------------------------------------------------=== 9276789Sdim * 10276789Sdim * This file implements __absvti2 for the compiler_rt library. 11276789Sdim * 12276789Sdim * ===----------------------------------------------------------------------=== 13276789Sdim */ 14276789Sdim 15276789Sdim#include "int_lib.h" 16276789Sdim 17276789Sdim#ifdef CRT_HAS_128BIT 18276789Sdim 19276789Sdim/* Returns: absolute value */ 20276789Sdim 21276789Sdim/* Effects: aborts if abs(x) < 0 */ 22276789Sdim 23276789SdimCOMPILER_RT_ABI ti_int 24276789Sdim__absvti2(ti_int a) 25276789Sdim{ 26276789Sdim const int N = (int)(sizeof(ti_int) * CHAR_BIT); 27276789Sdim if (a == ((ti_int)1 << (N-1))) 28276789Sdim compilerrt_abort(); 29276789Sdim const ti_int s = a >> (N - 1); 30276789Sdim return (a ^ s) - s; 31276789Sdim} 32276789Sdim 33276789Sdim#endif /* CRT_HAS_128BIT */ 34276789Sdim 35