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digraph Memory {
rankdir=RL;
node [shape=box];
P [label="Phi(memory)"];
S [label="Loop-body Store"];
P -> Entry [color=blue];
P -> S [color=blue,constraint=false]; // Backedge must not place Store before Phi.
S -> P [color=blue];
P -> Loop [style=dashed]; Return -> P [color=blue];
Return -> S [style=invis]; // Layout only: Phi, Store, Return from left to right.
}
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