[Bug target/106831] [13 Regression] mpfr-4.1.0 started failing 2 tests: tget_set_d64 and tget_set_d128

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106831

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
BTW, I admit I don't know much about decimal{32,64,128}, but
https://en.wikipedia.org/wiki/Decimal32_floating-point_format
says:
Because the significand is not normalized (there is no implicit leading "1"),
most values with less than 7 significant digits have multiple possible
representations; 1 × 10^2=0.1 × 10^3=0.01 × 10^4, etc. Zero has 192 possible
representations (384 when both signed zeros are included).
So, I think singleton_p should just always return false for
DECIMAL_FLOAT_TYPE_P (at least for now).