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Subject: [Bug tree-optimization/97767] [11 Regression] ICE in
 extract_range_basic, at vr-values.c:1445 since r11-4532-g054d7b9f6f6816a8
Date: Tue, 10 Nov 2020 08:29:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97767

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Aldy Hernandez <aldyh@gcc.gnu.org>:

https://gcc.gnu.org/g:3d3470e239e8040f642a8852721b4962b4ed36f2

commit r11-4864-g3d3470e239e8040f642a8852721b4962b4ed36f2
Author: Aldy Hernandez <aldyh@redhat.com>
Date:   Mon Nov 9 20:35:25 2020 +0100

    Normalize VARYING for -fstrict-enums.

    The problem here is that the representation for VARYING in
    -fstrict-enums is different between value_range and irange.

    The helper function irange::normalize_min_max() will normalize to
    VARYING only if setting the range to the entire domain of the
    underlying type.  That is, [0, 0xff..ff], not the domain as defined by
    -fstrict-enums.  This causes problems because the multi-range version
    of varying_p() will return true if the range is the domain as defined
    by -fstrict-enums.  Thus, normalize_min_max and varying_p have
    different concepts of varying for multi-ranges.

    (BTW, legacy ranges are different because they never look at the
    extremes of a range to determine varying-ness.  They only look at the
    kind field.)

    One approach is to change all the code to limit ranges to the domain
    in the -fstrict-enums world, but this won't work because there are
    various instances of gimple where the values assigned or compared are
    beyond the limits of TYPE_{MIN,MAX}_VALUE.  One example is the
    addition of 0xffffffff to represent subtraction.

    This patch fixes multi-range varying_p() and set_varying() to agree
    with the normalization code, using the extremes of the underlying type,
    to represent varying.

    gcc/ChangeLog:

            PR tree-optimization/97767
            * value-range.cc (dump_bound_with_infinite_markers): Use
            wi::min_value and wi::max_value.
            (range_tests_strict_enum): New.
            (range_tests): Call range_tests_strict_enum.
            * value-range.h (irange::varying_p): Use wi::min_value
            and wi::max_value.
            (irange::set_varying): Same.
            (irange::normalize_min_max): Remove comment.

    gcc/testsuite/ChangeLog:

            * g++.dg/opt/pr97767.C: New test.=