| Dan Gohman | 36a0947 | 2009-09-08 23:54:48 +0000 | [diff] [blame] | 1 | ; RUN: llc < %s -march=x86-64 | FileCheck %s |
| Bill Wendling | 108ecf3 | 2008-08-19 23:09:18 +0000 | [diff] [blame] | 2 | |
| 3 | @var = external global i64 ; <i64*> [#uses=1] |
| 4 | |
| 5 | define i32 @main() nounwind { |
| 6 | entry: |
| Evan Cheng | 37b7387 | 2009-07-30 08:33:02 +0000 | [diff] [blame] | 7 | ; CHECK: main: |
| 8 | ; CHECK: lock |
| 9 | ; CHECK: decq |
| Eli Friedman | 184944a | 2011-09-26 23:15:09 +0000 | [diff] [blame^] | 10 | atomicrmw sub i64* @var, i64 1 monotonic |
| Bill Wendling | 108ecf3 | 2008-08-19 23:09:18 +0000 | [diff] [blame] | 11 | unreachable |
| 12 | } |