llvm-project

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; RUN: opt %loadNPMPolly -passes=polly-codegen -S < %s | FileCheck %s
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;
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; llvm.org/PR25438
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; After loop versioning, a dominance check of a non-affine subregion's exit node
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; causes the dominance check to always fail any block in the scop. The
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; subregion's exit block has become polly_merge_new_and_old, which also receives
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; the control flow of the generated code. This would cause that any value for
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; implicit stores is assumed to be not from the scop.
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;
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; This checks that the stored value is indeed from the generated code.
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;
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; CHECK-LABEL: polly.stmt.do.body.entry:
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; CHECK:        a.phiops.reload = load i32, ptr %a.phiops
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;
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; CHECK-LABEL: polly.stmt.polly.merge_new_and_old.exit:
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; CHECK:         store i32 %polly.a, ptr %a.s2a
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define void @func() {
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entry:
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  br label %while.body
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while.body:
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  br label %do.body
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do.body:
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  %a = phi i32 [ undef, %while.body ], [ %b, %end_b ]
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  %cond = or i1 undef, undef
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  br i1 %cond, label %end_a, label %if_a
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if_a:
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  br label %end_a
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end_a:
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  br i1 undef, label %if_b, label %end_b
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if_b:
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  br label %end_b
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end_b:
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  %b = phi i32 [ undef, %if_b ], [ %a, %end_a ]
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  br i1 false, label %do.body, label %do.end
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do.end:
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  br label %return
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return:
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  ret void
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}
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