[Bug target/79487] Invalid _Decimal32 comparison on s390x

[vogt at linux dot vnet.ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79487

--- Comment #9 from Dominik Vogt <vogt at linux dot vnet.ibm.com> ---
(In reply to Jakub Jelinek from comment #8)
> This isn't truncation, but extension (SDmode to DDmode).  I presume all
> SDmode values are representable in DDmode, so I don't see anything wrong on
> that.

But -9223372036854775808 *isn't* an SDmode constant - the mantissa is too short
to represent the constant.