https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121233
Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
CC| |amonakov at gcc dot gnu.org
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
You have to compile in standards-conforming mode by specifying -std=c++17, or
explicitly specify -fexcess-precision=standard, or avoid producing
intermediates with excess precision by preferring SSE, -mfpmath=sse. Otherwise,
compiling for x87 instructions with 80-bit registers is full of gotchas like
that.
By default GCC is not standards-conforming here, making this outcome possible.
