1 /* ===-- subvdi3.c - Implement __subvdi3 -----------------------------------=== 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 __subvdi3 for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14 15 #include "int_lib.h" 16 #include <stdlib.h> 17 18 /* Returns: a - b */ 19 20 /* Effects: aborts if a - b overflows */ 21 22 di_int 23 __subvdi3(di_int a, di_int b) 24 { 25 di_int s = a - b; 26 if (b >= 0) 27 { 28 if (s > a) 29 abort(); 30 } 31 else 32 { 33 if (s <= a) 34 abort(); 35 } 36 return s; 37 } 38
