| //===-- subvsi3.c - Implement __subvsi3 -----------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements __subvsi3 for the compiler_rt library. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "int_lib.h" |
| #include <stdlib.h> |
| |
| // Returns: a - b |
| |
| // Effects: aborts if a - b overflows |
| |
| si_int |
| __subvsi3(si_int a, si_int b) |
| { |
| si_int s = a - b; |
| if (b >= 0) |
| { |
| if (s > a) |
| abort(); |
| } |
| else |
| { |
| if (s <= a) |
| abort(); |
| } |
| return s; |
| } |