1 //===-- subvti3.c - Implement __subvti3 -----------------------------------===// 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 __subvti3 for the compiler_rt library. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "int_lib.h" 14 15 #ifdef CRT_HAS_128BIT 16 17 // Returns: a - b 18 19 // Effects: aborts if a - b overflows 20 21 COMPILER_RT_ABI ti_int __subvti3(ti_int a, ti_int b) { 22 ti_int s = (tu_int)a - (tu_int)b; 23 if (b >= 0) { 24 if (s > a) 25 compilerrt_abort(); 26 } else { 27 if (s <= a) 28 compilerrt_abort(); 29 } 30 return s; 31 } 32 33 #endif // CRT_HAS_128BIT 34