1/* ===-- subvti3.c - Implement __subvti3 -----------------------------------=== 2 * 3 * The LLVM Compiler Infrastructure 4 * 5 * This file is distributed under the University of Illinois Open Source 6 * License. See LICENSE.TXT for details. 7 * 8 * ===----------------------------------------------------------------------=== 9 * 10 * This file implements __subvti3 for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14 15#if __x86_64 16 17#include "int_lib.h" 18#include <stdlib.h> 19 20/* Returns: a - b */ 21 22/* Effects: aborts if a - b overflows */ 23 24ti_int 25__subvti3(ti_int a, ti_int b) 26{ 27 ti_int s = a - b; 28 if (b >= 0) 29 { 30 if (s > a) 31 abort(); 32 } 33 else 34 { 35 if (s <= a) 36 abort(); 37 } 38 return s; 39} 40 41#endif /* __x86_64 */ 42