| ; RUN: llc -mtriple=aarch64-none-linux-gnu -verify-machineinstrs < %s | FileCheck %s |
| |
| define i32 @foo(i32* %var, i1 %cond) { |
| ; CHECK-LABEL: foo: |
| br i1 %cond, label %atomic_ver, label %simple_ver |
| simple_ver: |
| %oldval = load i32, i32* %var |
| %newval = add nsw i32 %oldval, -1 |
| store i32 %newval, i32* %var |
| br label %somewhere |
| atomic_ver: |
| fence seq_cst |
| %val = atomicrmw add i32* %var, i32 -1 monotonic |
| fence seq_cst |
| br label %somewhere |
| ; CHECK: dmb |
| ; CHECK: ldxr |
| ; CHECK: dmb |
| ; The key point here is that the second dmb isn't immediately followed by the |
| ; simple_ver basic block, which LLVM attempted to do when DMB had been marked |
| ; with isBarrier. For now, look for something that looks like "somewhere". |
| ; CHECK-NEXT: mov |
| somewhere: |
| %combined = phi i32 [ %val, %atomic_ver ], [ %newval, %simple_ver] |
| ret i32 %combined |
| } |
