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Subject: [Bug rtl-optimization/101562] [9/10 Regression] ICE in insert, at
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Date: Wed, 11 May 2022 06:21:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101562

--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:f7200dd27304455d4c96c008c4aac20f23aee5f2

commit r9-10095-gf7200dd27304455d4c96c008c4aac20f23aee5f2
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Fri Jul 23 19:55:16 2021 +0200

    expmed: Fix store_integral_bit_field [PR101562]

    Our documentation says that paradoxical subregs shouldn't appear
    in strict_low_part:
    '(strict_low_part (subreg:M (reg:N R) 0))'
         This expression code is used in only one context: as the
         destination operand of a 'set' expression.  In addition, the
         operand of this expression must be a non-paradoxical 'subreg'
         expression.
    but on the testcase below that triggers UB at runtime
    store_integral_bit_field emits exactly that.

    The following patch fixes it by ensuring the requirement is satisfied.

    2021-07-23  Jakub Jelinek  <jakub@redhat.com>

            PR rtl-optimization/101562
            * expmed.c (store_integral_bit_field): Only use movstrict_optab
            if the operand isn't paradoxical.

            * gcc.c-torture/compile/pr101562.c: New test.

    (cherry picked from commit 8408d34570c9fe9f3d22a25a76df2a4c64f08477)=