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This fixes SLP cycles leaking memory by maintaining a double-linked list of allocatd SLP nodes we can zap when we free the alloc pool. 2020-12-02 Richard Biener <rguenther@suse.de> PR tree-optimization/97630 * tree-vectorizer.h (_slp_tree::next_node, _slp_tree::prev_node): New. (vect_slp_init): Declare. (vect_slp_fini): Likewise. * tree-vectorizer.c (vectorize_loops): Call vect_slp_init/fini. (pass_slp_vectorize::execute): Likewise. * tree-vect-slp.c (vect_slp_init): New. (vect_slp_fini): Likewise. (slp_first_node): New global. (_slp_tree::_slp_tree): Link node into the SLP tree list. (_slp_tree::~_slp_tree): Delink node from the SLP tree list.
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