| ; RUN: llvm-as < %s | llc -march=x86-64 | FileCheck %s | |
| @var = external global i64 ; <i64*> [#uses=1] | |
| define i32 @main() nounwind { | |
| entry: | |
| ; CHECK: main: | |
| ; CHECK: lock | |
| ; CHECK: decq | |
| tail call i64 @llvm.atomic.load.sub.i64.p0i64( i64* @var, i64 1 ) ; <i64>:0 [#uses=0] | |
| unreachable | |
| } | |
| declare i64 @llvm.atomic.load.sub.i64.p0i64(i64*, i64) nounwind |