bad_node_traversal.ll
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; REQUIRES: asserts
; RUN: opt -regions -analyze -enable-new-pm=0 < %s | FileCheck %s
; RUN: opt -passes='print<regions>' -disable-output < %s 2>&1 | FileCheck %s
; While working on improvements to the region info analysis, this test
; case caused an incorrect region 3 => 8 to be detected.
define internal i8 @wibble() {
bb:
br i1 true, label %bb1, label %bb8
bb1: ; preds = %bb
switch i32 0, label %bb2 [
i32 0, label %bb3
i32 1, label %bb7
]
bb2: ; preds = %bb1
br label %bb4
bb3: ; preds = %bb1
br label %bb5
bb4: ; preds = %bb2
br label %bb6
bb5: ; preds = %bb3
br label %bb6
bb6: ; preds = %bb5, %bb4
br label %bb7
bb7: ; preds = %bb6, %bb1
br label %bb8
bb8: ; preds = %bb7, %bb
ret i8 1
}
; CHECK: [0] bb => <Function Return>
; CHECK-NEXT: [1] bb => bb8
; CHECK-NEXT: [2] bb1 => bb7
; CHECK-NEXT: End region tree