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Subject: [Bug tree-optimization/97424] Warn on invalid shift amount after
 inlining
Date: Thu, 12 Nov 2020 02:18:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97424

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by David Malcolm <dmalcolm@gcc.gnu.org>:

https://gcc.gnu.org/g:5e00ad3ffbfb4df7242c313a0d836f5b538eb2fb

commit r11-4930-g5e00ad3ffbfb4df7242c313a0d836f5b538eb2fb
Author: David Malcolm <dmalcolm@redhat.com>
Date:   Wed Nov 11 21:16:45 2020 -0500

    analyzer: warn on invalid shift counts [PR97424]

    This patch implements -Wanalyzer-shift-count-negative
    and -Wanalyzer-shift-count-overflow, analogous to the C/C++
    warnings -Wshift-count-negative and -Wshift-count-overflow, but
    implemented via interprocedural path analysis rather than via parsing
    in a front end, and thus capable of detecting interprocedural cases that
the
    warnings implemented in the front ends can miss.

    gcc/analyzer/ChangeLog:
            PR tree-optimization/97424
            * analyzer.opt (Wanalyzer-shift-count-negative): New.
            (Wanalyzer-shift-count-overflow): New.
            * region-model.cc (class shift_count_negative_diagnostic): New.
            (class shift_count_overflow_diagnostic): New.
            (region_model::get_gassign_result): Complain about shift counts
that
            are negative or are >=3D the operand's type's width.

    gcc/ChangeLog:
            PR tree-optimization/97424
            * doc/invoke.texi (Static Analyzer Options): Add
            -Wno-analyzer-shift-count-negative and
            -Wno-analyzer-shift-count-overflow.
            (-Wno-analyzer-shift-count-negative): New.
            (-Wno-analyzer-shift-count-overflow): New.

    gcc/testsuite/ChangeLog:
            PR tree-optimization/97424
            * gcc.dg/analyzer/invalid-shift-1.c: New test.=