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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/111818] [11/12/13/14 Regression] ICE with
 __builtin_memcpy with volatile and constants
Date: Tue, 17 Oct 2023 06:26:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111818

--- Comment #3 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:ce55521bcd149fdc431f1d78e706b66d470210ae

commit r14-4678-gce55521bcd149fdc431f1d78e706b66d470210ae
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Oct 16 12:50:46 2023 +0200

    middle-end/111818 - failed DECL_NOT_GIMPLE_REG_P setting of volatile

    The following addresses a missed DECL_NOT_GIMPLE_REG_P setting of
    a volatile declared parameter which causes inlining to substitute
    a constant parameter into a context where its address is required.

    The main issue is in update_address_taken which clears
    DECL_NOT_GIMPLE_REG_P from the parameter but fails to rewrite it
    because is_gimple_reg returns false for volatiles.  The following
    changes maybe_optimize_var to make the 1:1 correspondence between
    clearing DECL_NOT_GIMPLE_REG_P of a register typed decl and
    actually rewriting it to SSA.

            PR middle-end/111818
            * tree-ssa.cc (maybe_optimize_var): When clearing
            DECL_NOT_GIMPLE_REG_P always rewrite into SSA.

            * gcc.dg/torture/pr111818.c: New testcase.=