| Tobias Grosser | 495ad0b | 2017-03-05 14:08:28 +0000 | [diff] [blame] | 1 | ; REQUIRES: asserts |
| 2 | ; RUN: opt -regions -analyze < %s | FileCheck %s |
| 3 | ; RUN: opt < %s -passes='print<regions>' 2>&1 | FileCheck %s |
| 4 | |
| 5 | ; While working on improvements to the region info analysis, this test |
| 6 | ; case caused an incorrect region bb2 => bb3 to be detected. It is incorrect |
| 7 | ; because bb2 has an outgoing edge to bb4. This is interesting because |
| 8 | ; bb2 dom bb3 and bb3 pdom bb2, which should have been enough to prevent incoming |
| 9 | ; forward edges into the region and outgoing forward edges from the region. |
| 10 | |
| 11 | define void @meread_() nounwind { |
| 12 | bb: |
| 13 | br label %bb1 |
| 14 | |
| 15 | bb1: ; preds = %bb4, %bb |
| 16 | br label %bb2 |
| 17 | |
| 18 | bb2: ; preds = %bb1 |
| 19 | br i1 true, label %bb3, label %bb4 |
| 20 | |
| 21 | bb3: ; preds = %bb2 |
| 22 | br i1 true, label %bb4, label %bb5 |
| 23 | |
| 24 | bb4: ; preds = %bb3, %bb2 |
| 25 | br label %bb1 |
| 26 | |
| 27 | bb5: ; preds = %bb3 |
| 28 | ret void |
| 29 | } |
| 30 | |
| 31 | ; CHECK: [0] bb => <Function Return> |
| 32 | ; CHECK-NEXT: [1] bb1 => bb5 |
| 33 | ; CHECK-NEXT: End region tree |