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 19 COMPILER_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