https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111101
Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
CC| |amonakov at gcc dot gnu.org
--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
0x7fe5ed65 is a quiet NaN, not signaling (it differs from the input 0x7fa5ed65
sNaN by the leading mantissa bit 0x00400000).
IEEE-754 does not pin down which of the two payloads should be propagated when
both operands are NaNs, and neither do language standards, so for GCC
floating-point addition and similar operations are commutative.
Observed NaN payloads are not predictable and may change depending on
optimization level, choice of x87 vs. SSE instructions, etc. This is not a bug.
