| //===-- subvti3.c - Implement __subvti3 -----------------------------------===// |
| // |
| // 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 __subvti3 for the compiler_rt library. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "int_lib.h" |
| |
| #ifdef CRT_HAS_128BIT |
| |
| // Returns: a - b |
| |
| // Effects: aborts if a - b overflows |
| |
| COMPILER_RT_ABI ti_int __subvti3(ti_int a, ti_int b) { |
| ti_int s = (tu_int)a - (tu_int)b; |
| if (b >= 0) { |
| if (s > a) |
| compilerrt_abort(); |
| } else { |
| if (s <= a) |
| compilerrt_abort(); |
| } |
| return s; |
| } |
| |
| #endif // CRT_HAS_128BIT |
