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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-exception6//7//===----------------------------------------------------------------------===//8//9// This file implements __subvsi3 for the compiler_rt library.10//11//===----------------------------------------------------------------------===//12 13#include "int_lib.h"14 15// Returns: a - b16 17// Effects: aborts if a - b overflows18 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