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The vectorizer, for large permuted grouped loads, generates inefficient intermediate code (cleaned up only later) that runs into complexity issues in SCEV analysis and elsewhere. For the non-single-element interleaving case we already put a hard limit in place, this applies the same limit to the missing case. 2021-01-11 Richard Biener <rguenther@suse.de> PR tree-optimization/91403 * tree-vect-data-refs.c (vect_analyze_group_access_1): Cap single-element interleaving group size at 4096 elements. * gcc.dg/vect/pr91403.c: New testcase.
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