llvm-project

1
//===-- subvdi3.c - Implement __subvdi3 -----------------------------------===//
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 __subvdi3 for the compiler_rt library.
10
//
11
//===----------------------------------------------------------------------===//
12

13
#include "int_lib.h"
14

15
// Returns: a - b
16

17
// Effects: aborts if a - b overflows
18

19
COMPILER_RT_ABI di_int __subvdi3(di_int a, di_int b) {
20
  di_int s = (du_int)a - (du_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