| //===-- absvti2.c - Implement __absvdi2 -----------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements __absvti2 for the compiler_rt library. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #if __x86_64 |
| |
| #include "int_lib.h" |
| #include <stdlib.h> |
| |
| // Returns: absolute value |
| |
| // Effects: aborts if abs(x) < 0 |
| |
| ti_int |
| __absvti2(ti_int a) |
| { |
| const int N = (int)(sizeof(ti_int) * CHAR_BIT); |
| if (a == ((ti_int)1 << (N-1))) |
| abort(); |
| const ti_int s = a >> (N - 1); |
| return (a ^ s) - s; |
| } |
| |
| #endif |