[Bug libgcc/120691] _Decimal128 arithmetic error under FE_UPWARD

[hjl.tools at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120691

--- Comment #17 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 62249
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62249&action=edit
A different patch