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order_nodes are used to implement ordered comparisons between two insns with the same program point number. remove_insn would remove an order_node from its splay tree, but didn't remove it from the insn. This caused confusion if the insn was later reinserted somewhere else that also needed an order_node. gcc/ PR rtl-optimization/115929 * rtl-ssa/insns.cc (function_info::remove_insn): Remove an order_node from the instruction as well as from the splay tree. gcc/testsuite/ PR rtl-optimization/115929 * gcc.dg/torture/pr115929-1.c: New test.
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