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This rewrites hybrid SLP detection to be simpler and cope with group size changes in the SLP graph. In particular detection works starting from non-SLP stmts following use->def chains rather than walking the SLP graph and following def->use chains. It's all temporary of course since non-SLP and thus hybrid SLP will go away. 2020-05-05 Richard Biener <rguenther@suse.de> * tree-vect-slp.c (struct vdhs_data): New. (vect_detect_hybrid_slp): New walker. (vect_detect_hybrid_slp): Rewrite.
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