; RUN: llc < %s -mtriple=thumbv6-apple-darwin | FileCheck %s -check-prefix=V6
; RUN: llc < %s -mtriple=thumbv7-apple-darwin -mattr=-db | FileCheck %s -check-prefix=V6
; RUN: llc < %s -march=thumb -mcpu=cortex-m0 | FileCheck %s -check-prefix=V6M
define void @t1() {
; V6: t1:
; V6: blx {{_*}}sync_synchronize
; V6M: t1:
; V6M: dmb ish
fence seq_cst
ret void
}