llvm-project

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; RUN: opt %loadNPMPolly '-passes=print<polly-detect>' -disable-output < %s 2>&1 | FileCheck %s
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; RUN: opt %loadNPMPolly -passes=polly-codegen -verify-region-info -disable-output < %s
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;
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; This is a scop directly precedented by a region, i.e. the scop's entry is the
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; region's exit block. This test is to ensure that the RegionInfo is correctly
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; preserved.
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;
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; CHECK: Valid Region for Scop: region2 => return
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;
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define void @f1(ptr %A, i64 %N) nounwind {
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entry:
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  br label %region1
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region1:
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  %indvar1 = phi i64 [ 0, %entry ], [ %indvar1.next, %region1 ]
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  fence seq_cst
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  %indvar1.next = add nsw i64 %indvar1, 1
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  %exitcond1 = icmp eq i64 %indvar1.next, %N
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  br i1 %exitcond1, label %region2, label %region1
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region2:
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  %indvar2 = phi i64 [ 0, %region1 ], [ %indvar2.next, %region2 ]
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  %scevgep2 = getelementptr i64, ptr %A, i64 %indvar2
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  store i64 %indvar2, ptr %scevgep2
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  %indvar2.next = add nsw i64 %indvar2, 1
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  %exitcond2 = icmp eq i64 %indvar2.next, %N
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  br i1 %exitcond2, label %return, label %region2
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return:
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  ret void
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}
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