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This makes hybrid SLP discovery deal with stmts indirectly consumed by SLP, for example via patterns. This means that all uses of a stmt end up in SLP vectorized stmts. This helps my prototype patches for PR97832 where I make SLP discovery re-associate chains to make operands match. This ends up building SLP computation nodes without 1:1 representatives in the scalar IL and thus no scalar lane defs in SLP_TREE_SCALAR_STMTS. Nevertheless all of the original scalar stmts are consumed so this represents another kind of SLP pattern for the computation chain result. 2020-11-20 Richard Biener <rguenther@suse.de> * tree-vect-slp.c (maybe_push_to_hybrid_worklist): New function. (vect_detect_hybrid_slp): Use it. Perform a backward walk over the IL.
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