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The bitmap_set_bit call before fold_offsets in do_analysis is intentional: fold_offsets requires all uses of a definition to already be in can_fold_insns before it will mark the definition as foldable. Pre-marking the memory instruction (which is the root use) is necessary for its address definitions to pass this check during the DFS. Replace the generic comment with one that explains this dependency. gcc/ChangeLog: * fold-mem-offsets.cc (do_analysis): Revise comment.
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