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