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Subject: [Bug tree-optimization/106365] Miss to handle ifn .LEN_STORE in FRE
Date: Thu, 21 Jul 2022 11:06:53 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106365

--- Comment #15 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:bd9837bc3ca1344c32aef7ba9f8fa1785063132e

commit r13-1777-gbd9837bc3ca1344c32aef7ba9f8fa1785063132e
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Jul 20 12:28:26 2022 +0200

    Teach VN about masked/len stores

    The following teaches VN to handle reads from .MASK_STORE and
    .LEN_STORE.  For this push_partial_def is extended first for
    convenience so we don't have to handle the full def case in the
    caller (possibly other paths can be simplified then).  Also
    the partial definition stored value can have an offset applied
    so we don't have to build a fake RHS when we register the pieces
    of an existing store.

            PR tree-optimization/106365
            * tree-ssa-sccvn.cc (pd_data::rhs_off): New field determining
            the offset to start encoding of RHS from.
            (vn_walk_cb_data::vn_walk_cb_data): Initialize it.
            (vn_walk_cb_data::push_partial_def): Allow the first partial
            definition to be fully providing the def.  Offset RHS
            before encoding if requested.
            (vn_reference_lookup_3): Initialize def_rhs everywhere.
            Add support for .MASK_STORE and .LEN_STORE (partial) definition=
s.

            * gcc.target/i386/vec-maskstore-vn.c: New testcase.=