Hello,
"C. Neidahl" <[email protected]> wrote:
> I suppose the most exact check for this situation would have to inspect
> some more LDBL_*
> defines, otherwise 128-bit IEEE-backed long double
> would end up not getting checked.
I see the situation.
In gnulib, to detect "double double" situation, it checks:
LDBL_MANT_DIG == 106
I wonder if it works better than use of LDBL_IS_IEC_60559 macro.
When we use the macro LDBL_IS_IEC_60559 (new for C23), if there is an
environment (of PowerPC 64 architecture) where LDBL_IS_IEC_60559 is not
defined (say, compiler is older) but actually uses standard floating
point, I'm afraid it skips the test.
--
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