[Bug rtl-optimization/105376] ICE: in decimal_to_decnumber, at dfp.cc:134 with _Decimal128 at -O -g

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105376

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:39c56695c70a2052fc6bdcfca606dfff9c2fa975

commit r12-8348-g39c56695c70a2052fc6bdcfca606dfff9c2fa975
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Apr 27 08:28:31 2022 +0200

    middle-end/105376 - invalid REAL_CST for DFP constant

    We are eventually ICEing in decimal_to_decnumber on non-decimal
    REAL_VALUE_TYPE that creep in from uses of build_real (..., dconst*)
    for DFP types.  The following extends the decimal_to_decnumber
    special-casing of dconst* to build_real, avoiding the bogus REAL_CSTs
    from creeping into the IL and modified to ones not handled by
    the decimal_to_decnumber special casing.  It also makes sure to
    ICE for not handled dconst* values at the point we build the REAL_CST.

    2022-04-27  Richard Biener  <rguenther@suse.de>

            PR middle-end/105376
            * tree.cc (build_real): Special case dconst* arguments
            for decimal floating point types.

            * gcc.dg/pr105376.c: New testcase.

    (cherry picked from commit e27eef7478f30ea79048dbde3317e89679d75a6e)