| ; REQUIRES: asserts |
| ; RUN: opt -regions -analyze -enable-new-pm=0 < %s | FileCheck %s |
| ; RUN: opt < %s -passes='print<regions>' 2>&1 | FileCheck %s |
| |
| ; While working on improvements to the region info analysis, this test |
| ; case caused an incorrect region bb2 => bb3 to be detected. It is incorrect |
| ; because bb2 has an outgoing edge to bb4. This is interesting because |
| ; bb2 dom bb3 and bb3 pdom bb2, which should have been enough to prevent incoming |
| ; forward edges into the region and outgoing forward edges from the region. |
| |
| define void @meread_() nounwind { |
| bb: |
| br label %bb1 |
| |
| bb1: ; preds = %bb4, %bb |
| br label %bb2 |
| |
| bb2: ; preds = %bb1 |
| br i1 true, label %bb3, label %bb4 |
| |
| bb3: ; preds = %bb2 |
| br i1 true, label %bb4, label %bb5 |
| |
| bb4: ; preds = %bb3, %bb2 |
| br label %bb1 |
| |
| bb5: ; preds = %bb3 |
| ret void |
| } |
| |
| ; CHECK: [0] bb => <Function Return> |
| ; CHECK-NEXT: [1] bb1 => bb5 |
| ; CHECK-NEXT: End region tree |
