37 lines
1.0 KiB
LLVM
37 lines
1.0 KiB
LLVM
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; RUN: opt < %s -lowerswitch -S | FileCheck %s
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; This test verifies -lowerswitch does not crash when an removing an
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; unreachable default branch causes a PHI node used as the switch
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; condition to be erased.
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define void @f() local_unnamed_addr {
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entry:
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br label %sw.epilog
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sw.epilog: ; preds = %sw.epilog.outer, %for.body
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%i = phi i32 [ undef, %for.body ], [ 0, %entry ]
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br i1 undef, label %for.body, label %for.end
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for.body: ; preds = %sw.epilog
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switch i32 %i, label %sw.epilog [
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i32 0, label %sw.epilog.outer.backedge.loopexit
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i32 1, label %sw.epilog.outer.backedge
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]
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sw.epilog.outer.backedge.loopexit: ; preds = %for.body
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br label %for.end
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sw.epilog.outer.backedge: ; preds = %for.body
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unreachable
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for.end: ; preds = %sw.epilog
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ret void
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}
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; The phi and the switch should both be eliminated.
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; CHECK: @f()
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; CHECK: sw.epilog:
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; CHECK-NOT: phi
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; CHECK: for.body:
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; CHECK-NOT: switch
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