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Subject: [Bug tree-optimization/105517] [13 Regression] Missing diagnostic
 after recent optimizer improvements
Date: Mon, 09 May 2022 11:42:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105517

--- Comment #3 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:faabc751d0bb7e7fe86abfe8991b0307d585874a

commit r13-205-gfaabc751d0bb7e7fe86abfe8991b0307d585874a
Author: Richard Biener <rguenther@suse.de>
Date:   Mon May 9 11:33:44 2022 +0200

    tree-optimization/105517 - avoid offset truncation during VN

    When value-numbering an address expression like
    &p_74(D)->a1x[4294967295].a1; we are accumulating the byte offset
    in an 64bit integer.  When later exploiting the duality between
    that and a POINTER_PLUS_EXPR we should avoid truncating that
    offset to fit in the target specific sizetype.  While such
    overflows are generally undefined behavior, exploiting this
    may leads to spurious missing diagnostics.

    2022-05-09  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/105517
            * tree-ssa-sccvn.cc (vn_reference_lookup): Make sure the
accumulated
            offset can be represented in the POINTER_PLUS_EXPR IL.
            (vn_reference_insert): Likewise.
            * poly-int.h (sext_hwi): Add poly version of sext_hwi.=