[Bug libgcc/65833] Attempting to convert 128 bit integers to 128 bit decimal floating-point results in an unresolved symbol

[Bug libgcc/65833] Attempting to convert 128 bit integers to 128 bit decimal floating-point results in an unresolved symbol

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65833

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mpolacek at gcc dot gnu.org
          Component|c                           |libgcc

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Looks like libbid is missing conversion functions for uint128 -> _Decimal128.
It is able to convert uint64 -> _Decimal128 though, for that .expand generates
__bid_floatunsditd.

[Bug libgcc/65833] Attempting to convert 128 bit integers to 128 bit decimal floating-point results in an unresolved symbol

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65833

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org
   Last reconfirmed|                            |2023-11-06
             Status|UNCONFIRMED                 |ASSIGNED

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 56517
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56517&action=edit
gcc14-pr65833.patch

Untested implementation (on top of _BitInt support, so for now x86_64 only,
but with the hope that other int128 targets will gain _BitInt support soon).

[Bug libgcc/65833] Attempting to convert 128 bit integers to 128 bit decimal floating-point results in an unresolved symbol

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65833

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:f172b9d38db426d2b102c0f9c1fd58672acc6c9b

commit r14-5266-gf172b9d38db426d2b102c0f9c1fd58672acc6c9b
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Thu Nov 9 09:14:07 2023 +0100

    libgcc: Add {unsigned ,}__int128 <-> _Decimal{32,64,128} conversion support
[PR65833]

    The following patch adds the missing
    {unsigned ,}__int128 <-> _Decimal{32,64,128}
    conversion support into libgcc.a on top of the _BitInt support
    (doing it without that would be larger amount of code and I hope all
    the targets which support __int128 will eventually support _BitInt,
    after all it is a required part of C23) and because it is in libgcc.a
    only, it doesn't hurt that much if it is added for some architectures
    only in GCC 15.
    Initially I thought about doing this on the compiler side, but doing
    it on the library side seems to be easier and more -Os friendly.
    The tests currently require bitint effective target, that can be
    removed when all the int128 targets support bitint.

    2023-11-09  Jakub Jelinek  <jakub@redhat.com>

            PR libgcc/65833
    libgcc/
            * config/t-softfp (softfp_bid_list): Add
            {U,}TItype <-> _Decimal{32,64,128} conversions.
            * soft-fp/floattisd.c: New file.
            * soft-fp/floattidd.c: New file.
            * soft-fp/floattitd.c: New file.
            * soft-fp/floatuntisd.c: New file.
            * soft-fp/floatuntidd.c: New file.
            * soft-fp/floatuntitd.c: New file.
            * soft-fp/fixsdti.c: New file.
            * soft-fp/fixddti.c: New file.
            * soft-fp/fixtdti.c: New file.
            * soft-fp/fixunssdti.c: New file.
            * soft-fp/fixunsddti.c: New file.
            * soft-fp/fixunstdti.c: New file.
    gcc/testsuite/
            * gcc.dg/dfp/int128-1.c: New test.
            * gcc.dg/dfp/int128-2.c: New test.
            * gcc.dg/dfp/int128-3.c: New test.
            * gcc.dg/dfp/int128-4.c: New test.