b0e5163960
This introduces a bias parameter for the len_load/len_store ifns as well as optabs that is meant to distinguish between Power and s390 variants. PowerPC's instructions require a bias of 0, while in s390's case vll/vstl do not support lengths of zero bytes and a bias of -1 must be used. gcc/ChangeLog: * internal-fn.c (expand_partial_load_optab_fn): Add bias. (expand_partial_store_optab_fn): Likewise. (internal_len_load_store_bias): New function. * internal-fn.h (VECT_PARTIAL_BIAS_UNSUPPORTED): New define. (internal_len_load_store_bias): New function. * tree-vect-loop-manip.c (vect_set_loop_controls_directly): Set bias. (vect_set_loop_condition_partial_vectors): Add header_seq parameter. * tree-vect-loop.c (vect_verify_loop_lens): Verify bias. (vect_estimate_min_profitable_iters): Account for bias. (vect_get_loop_len): Add bias-adjusted length. * tree-vect-stmts.c (vectorizable_store): Use. (vectorizable_load): Use. * tree-vectorizer.h (struct rgroup_controls): Add bias-adjusted length. (LOOP_VINFO_PARTIAL_LOAD_STORE_BIAS): New macro. * config/rs6000/vsx.md: Use const0 bias predicate. * doc/md.texi: Document bias value. |
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