| /* ===-- subvti3.c - Implement __subvti3 -----------------------------------=== |
| * |
| * The LLVM Compiler Infrastructure |
| * |
| * This file is dual licensed under the MIT and the University of Illinois Open |
| * Source Licenses. See LICENSE.TXT for details. |
| * |
| * ===----------------------------------------------------------------------=== |
| * |
| * 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 */ |
