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This computes vect_determine_mask_precision in a RPO forward walk rather than in a backward walk and using a worklist. It will make fixing PR97706 easier but for bisecting I wanted it to be separate. 2020-11-06 Richard Biener <rguenther@suse.de> PR tree-optimization/97706 * tree-vect-patterns.c (vect_determine_mask_precision): Remove worklist operation. (vect_determine_stmt_precisions): Do not call vect_determine_mask_precision here. (vect_determine_precisions): Compute mask precision in a forward walk.
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