[Bug libgcc/105669] New: DFP to HF (_Float16) conversions use incorrect rounding

[clyon at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105669

            Bug ID: 105669
           Summary: DFP to HF (_Float16) conversions use incorrect
                    rounding
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgcc
          Assignee: unassigned at gcc dot gnu.org
          Reporter: clyon at gcc dot gnu.org
  Target Milestone: ---

Support for conversions between DFP and _Float16 have been introduced with
r13-687-g308a0af4f91324.

For simplicity it uses intermediate conversions with SFmode, leading to double
rounding which probably produces incorrectly rounded results.

See also PR97635