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Subject: [Bug middle-end/105263] [9/10/11 Regression] ICE: gimple check:
 expected gimple_assign(error_mark), have gimple_nop() in gimple_assign_rhs1,
 at gimple.h:2655 with _Decimal64 -ffast-math since r7-950-g8a85cee26eabf5cf
Date: Thu, 19 May 2022 14:03:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105263

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:b2557f9081e5bf440abe3fc184cbdaea0447ec64

commit r11-10017-gb2557f9081e5bf440abe3fc184cbdaea0447ec64
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Apr 13 14:53:40 2022 +0200

    tree-optimization/105263 - reassoc and DFP

    reassoc has certain tricks which in the end depend on the ability
    to undo them.  For DFP creating a -1. constant is easy but
    re-identifying is appearantly not - real_minus_onep rejects those
    outright for DFP.  So we have to disable (at least) this one trick.

    2022-04-13  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/105263
            * tree-ssa-reassoc.c (try_special_add_to_ops): Do not consume
            negates in multiplication chains with DFP.

            * gcc.dg/pr105263.c: New testcase.

    (cherry picked from commit ca145c6306f19272ac8756d88c4eba0bfdf01dfb)=