1 ; RUN: llc < %s -march=x86-64 | FileCheck %s 2 3 @var = external global i64 ; <i64*> [#uses=1] 4 5 define i32 @main() nounwind { 6 entry: 7 ; CHECK: main: 8 ; CHECK: lock 9 ; CHECK: decq 10 atomicrmw sub i64* @var, i64 1 monotonic 11 unreachable 12 } 13
