| ; RUN: opt -gvn -S -o - %s | FileCheck %s |
| |
| ; If a branch has two identical successors, we cannot declare either dead. |
| |
| define void @widget(i1 %p) { |
| entry: |
| br label %bb2 |
| |
| bb2: |
| %t1 = phi i64 [ 0, %entry ], [ %t5, %bb7 ] |
| %t2 = add i64 %t1, 1 |
| %t3 = icmp ult i64 0, %t2 |
| br i1 %t3, label %bb3, label %bb4 |
| |
| bb3: |
| %t4 = call i64 @f() |
| br label %bb4 |
| |
| bb4: |
| ; CHECK-NOT: phi {{.*}} undef |
| %foo = phi i64 [ %t4, %bb3 ], [ 0, %bb2 ] |
| br i1 %p, label %bb5, label %bb6 |
| |
| bb5: |
| br i1 true, label %bb7, label %bb7 |
| |
| bb6: |
| br i1 true, label %bb7, label %bb7 |
| |
| bb7: |
| %t5 = add i64 %t1, 1 |
| br i1 %p, label %bb2, label %bb8 |
| |
| bb8: |
| ret void |
| } |
| |
| declare i64 @f() |
