| //===-- subvsi3.c - Implement __subvsi3 -----------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements __subvsi3 for the compiler_rt library. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "int_lib.h" |
| |
| // Returns: a - b |
| |
| // Effects: aborts if a - b overflows |
| |
| COMPILER_RT_ABI si_int __subvsi3(si_int a, si_int b) { |
| si_int s = (su_int)a - (su_int)b; |
| if (b >= 0) { |
| if (s > a) |
| compilerrt_abort(); |
| } else { |
| if (s <= a) |
| compilerrt_abort(); |
| } |
| return s; |
| } |
