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1a4d82fc JJ |
1 | /* ===-- subvdi3.c - Implement __subvdi3 -----------------------------------=== |
2 | * | |
3 | * The LLVM Compiler Infrastructure | |
4 | * | |
5 | * This file is dual licensed under the MIT and the University of Illinois Open | |
6 | * Source Licenses. See LICENSE.TXT for details. | |
7 | * | |
8 | * ===----------------------------------------------------------------------=== | |
9 | * | |
10 | * This file implements __subvdi3 for the compiler_rt library. | |
11 | * | |
12 | * ===----------------------------------------------------------------------=== | |
13 | */ | |
14 | ||
15 | #include "int_lib.h" | |
16 | ||
17 | /* Returns: a - b */ | |
18 | ||
19 | /* Effects: aborts if a - b overflows */ | |
20 | ||
21 | COMPILER_RT_ABI di_int | |
22 | __subvdi3(di_int a, di_int b) | |
23 | { | |
92a42be0 | 24 | di_int s = (du_int) a - (du_int) b; |
1a4d82fc JJ |
25 | if (b >= 0) |
26 | { | |
27 | if (s > a) | |
28 | compilerrt_abort(); | |
29 | } | |
30 | else | |
31 | { | |
32 | if (s <= a) | |
33 | compilerrt_abort(); | |
34 | } | |
35 | return s; | |
36 | } |