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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-exception6//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_128BIT16 17// Returns: a - b18 19// Effects: aborts if a - b overflows20 21COMPILER_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_128BIT34