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Subject: [Bug tree-optimization/79334] Segfault on tree loop hoisting
Date: Mon, 23 Aug 2021 09:53:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D79334

--- 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:ad665deeafd31238b537139385e1e80b40c10e0c

commit r12-3071-gad665deeafd31238b537139385e1e80b40c10e0c
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Aug 23 09:57:05 2021 +0200

    tree-optimization/79334 - avoid PRE of possibly trapping array-ref

    This replicates tree-eh.c in_array_bound_p into VNs
    vn_reference_may_trap to fix hoisting of a possibly trapping
    ARRAY_REF across a call that might not return.

    2021-08-23  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/79334
            * tree-ssa-sccvn.c (copy_reference_ops_from_ref): Record
            a type also for COMPONENT_REFs.
            (vn_reference_may_trap): Check ARRAY_REF with constant index
            against the array domain.

            * gcc.dg/torture/pr79334-0.c: New testcase.
            * gcc.dg/torture/pr79334-1.c: Likewise.=