| Tim Northover | e0e3aef | 2013-01-31 12:12:40 +0000 | [diff] [blame^] | 1 | ; RUN: llc -march=aarch64 < %s | FileCheck %s |
| 2 | |
| 3 | define i32 @foo(i32* %var, i1 %cond) { |
| 4 | ; CHECK: foo: |
| 5 | br i1 %cond, label %atomic_ver, label %simple_ver |
| 6 | simple_ver: |
| 7 | %oldval = load i32* %var |
| 8 | %newval = add nsw i32 %oldval, -1 |
| 9 | store i32 %newval, i32* %var |
| 10 | br label %somewhere |
| 11 | atomic_ver: |
| 12 | %val = atomicrmw add i32* %var, i32 -1 seq_cst |
| 13 | br label %somewhere |
| 14 | ; CHECK: dmb |
| 15 | ; CHECK: ldxr |
| 16 | ; CHECK: dmb |
| 17 | ; The key point here is that the second dmb isn't immediately followed by the |
| 18 | ; simple_ver basic block, which LLVM attempted to do when DMB had been marked |
| 19 | ; with isBarrier. For now, look for something that looks like "somewhere". |
| 20 | ; CHECK-NEXT: mov |
| 21 | somewhere: |
| 22 | %combined = phi i32 [ %val, %atomic_ver ], [ %newval, %simple_ver] |
| 23 | ret i32 %combined |
| 24 | } |