1; RUN: llc -mtriple=aarch64-linux-gnu %s -o - | FileCheck %s --check-prefix=LINUX 2; RUN: llc -mtriple=aarch64-apple-ios %s -o - | FileCheck %s --check-prefix=IOS 3; RUN: llc -mtriple=aarch64-linux-gnueabihf %s -filetype=obj -o %t 4; RUN: llvm-objdump -d %t | FileCheck %s --check-prefix=OBJ 5 6; OBJ-NOT: dmb 7 8define void @fence_singlethread() { 9; LINUX-LABEL: fence_singlethread: 10; LINUX-NOT: dmb 11; LINUX: // COMPILER BARRIER 12; LINUX-NOT: dmb 13 14; IOS-LABEL: fence_singlethread: 15; IOS-NOT: dmb 16; IOS: ; COMPILER BARRIER 17; IOS-NOT: dmb 18 19 fence syncscope("singlethread") seq_cst 20 ret void 21} 22