1276789Sdim/* ===-- subvdi3.c - Implement __subvdi3 -----------------------------------=== 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 __subvdi3 for the compiler_rt library. 11276789Sdim * 12276789Sdim * ===----------------------------------------------------------------------=== 13276789Sdim */ 14276789Sdim 15276789Sdim#include "int_lib.h" 16276789Sdim 17276789Sdim/* Returns: a - b */ 18276789Sdim 19276789Sdim/* Effects: aborts if a - b overflows */ 20276789Sdim 21276789SdimCOMPILER_RT_ABI di_int 22276789Sdim__subvdi3(di_int a, di_int b) 23276789Sdim{ 24276789Sdim di_int s = (du_int) a - (du_int) b; 25276789Sdim if (b >= 0) 26276789Sdim { 27276789Sdim if (s > a) 28276789Sdim compilerrt_abort(); 29276789Sdim } 30276789Sdim else 31276789Sdim { 32276789Sdim if (s <= a) 33276789Sdim compilerrt_abort(); 34276789Sdim } 35276789Sdim return s; 36276789Sdim} 37