[PATCH 2/2] libstdc++: Fix endianness issue with IBM long double [PR98384]

[Jonathan Wakely]

On Mon, 22 Feb 2021, 22:13 Patrick Palka via Libstdc++, <
libstdc++@gcc.gnu.org> wrote:

> The logic in std::to_chars for extracting the high- and low-order parts
> of a IBM long double value does the right thing on powerpc64le, but not
> on powerpc64be.  This patch makes the extraction endian-agnostic, which
> fixes the execution FAIL of to_chars/long_double.cc on powerpc64be.
>
> Tested on powerpc64le and powerpc64be.  Does this look OK for trunk?
>


I was going to suggest __builtin_unpack_longdouble but actually since you
want the bits this is better. You'd need another step to get the bits from
each double.

OK for trunk.