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Subject: [Bug tree-optimization/101668] BB vectorizer doesn't handle lowpart
 of existing vector
Date: Thu, 02 Jun 2022 06:46:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101668

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:08afab6f8642f58f702010ec196dce3b00955627

commit r13-926-g08afab6f8642f58f702010ec196dce3b00955627
Author: Richard Biener <rguenther@suse.de>
Date:   Tue May 31 09:37:05 2022 +0200

    tree-optimization/101668 - relax SLP of existing vectors

    This relaxes the conditions on SLPing extracts from existing vectors
    leveraging the relaxed VEC_PERM conditions on the input vs output
    vector type compatibility.  It also handles lowpart extracts
    and concats without VEC_PERMs now.

    2022-05-25  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/101668
            * tree-vect-slp.cc (vect_build_slp_tree_1): Allow BIT_FIELD_REFs
            for vector types with compatible lane types.
            (vect_build_slp_tree_2): Deal with this.
            (vect_add_slp_permutation): Adjust.  Emit lowpart/concat
            special cases without VEC_PERM.
            (vectorizable_slp_permutation): Select the operand vector
            type and relax requirements.  Handle identity permutes
            with mismatching operand types.
            * optabs-query.cc (can_vec_perm_const_p): Only allow variable
            permutes for op_mode =3D=3D mode.

            * gcc.target/i386/pr101668.c: New testcase.
            * gcc.dg/vect/bb-slp-pr101668.c: Likewise.=