1 ; RUN: llc -mtriple=aarch64-none-linux-gnu -verify-machineinstrs < %s | FileCheck %s 2 3 define i32 @foo(i32* %var, i1 %cond) { 4 ; CHECK-LABEL: foo: 5 br i1 %cond, label %atomic_ver, label %simple_ver 6 simple_ver: 7 %oldval = load i32, i32* %var 8 %newval = add nsw i32 %oldval, -1 9 store i32 %newval, i32* %var 10 br label %somewhere 11 atomic_ver: 12 fence seq_cst 13 %val = atomicrmw add i32* %var, i32 -1 monotonic 14 fence seq_cst 15 br label %somewhere 16 ; CHECK: dmb 17 ; CHECK: ldxr 18 ; CHECK: dmb 19 ; The key point here is that the second dmb isn't immediately followed by the 20 ; simple_ver basic block, which LLVM attempted to do when DMB had been marked 21 ; with isBarrier. For now, look for something that looks like "somewhere". 22 ; CHECK-NEXT: mov 23 somewhere: 24 %combined = phi i32 [ %val, %atomic_ver ], [ %newval, %simple_ver] 25 ret i32 %combined 26 } 27
