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Subject: [Bug tree-optimization/99777] [11 Regression] ICE in build2, at
 tree.c:4869 with -O3
Date: Tue, 30 Mar 2021 22:41:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99777

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:afe9a630eae114665e77402ea083201c9d406e99

commit r10-9625-gafe9a630eae114665e77402ea083201c9d406e99
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Mon Mar 29 12:35:32 2021 +0200

    fold-const: Fix ICE in extract_muldiv_1 [PR99777]

    extract_muldiv{,_1} is apparently only prepared to handle scalar integer
    operations, the callers ensure it by only calling it if the divisor or
    one of the multiplicands is INTEGER_CST and because neither multiplicat=
ion
    nor division nor modulo are really supported e.g. for pointer types,
nullptr
    type etc.  But the CASE_CONVERT handling doesn't really check if it isn=
't
    a cast from some other type kind, so on the testcase we end up trying to
    build MULT_EXPR in POINTER_TYPE which ICEs.  A few years ago Marek has
    added ANY_INTEGRAL_TYPE_P checks to two spots, but the code uses
    TYPE_PRECISION which means something completely different for vector ty=
pes,
    etc.
    So IMNSHO we should just punt on conversions from non-integrals or
    non-scalar integrals.

    2021-03-29  Jakub Jelinek  <jakub@redhat.com>

            PR tree-optimization/99777
            * fold-const.c (extract_muldiv_1): For conversions, punt on cas=
ts
from
            types other than scalar integral types.

            * g++.dg/torture/pr99777.C: New test.=