1//===-- subvsi3.c - Implement __subvsi3 -----------------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This file implements __subvsi3 for the compiler_rt library. 10// 11//===----------------------------------------------------------------------===// 12 13#include "int_lib.h" 14 15// Returns: a - b 16 17// Effects: aborts if a - b overflows 18 19COMPILER_RT_ABI si_int __subvsi3(si_int a, si_int b) { 20 si_int s = (su_int)a - (su_int)b; 21 if (b >= 0) { 22 if (s > a) 23 compilerrt_abort(); 24 } else { 25 if (s <= a) 26 compilerrt_abort(); 27 } 28 return s; 29} 30