34 lines
1.1 KiB
LLVM
34 lines
1.1 KiB
LLVM
; REQUIRES: asserts
|
|
; RUN: opt -regions -analyze < %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
|