[Bug target/65242] [5 Regression] ICE (in gen_add2_insn, at optabs.c:4761) on powerpc64le-linux-gnu

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65242

--- Comment #13 from Michael Meissner <meissner at gcc dot gnu.org> ---
My gut feeling is we don't want to change ?m to !m, because it might impact
floating point conversions <-> integer, where we need the DI mode in a floating
point register.  In addition, I might worry that it could impact breaking apart
_Decimal128 values, which I believe uses DImode for the two parts.  I was also
trying to make the minimal change, and I didn't want an iteration where we fix
up any collateral damage.