[Bug middle-end/57484] 'std::numeric_limits< T >::signaling_NaN()' signaling-bit is incorrect for x86 32-bit.

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57484

--- Comment #11 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Paolo Carlini from comment #10)
> Maybe Uros can help.

On an x86 target using the legacy x87 instructions and the 80-bit registers, a
load of a 64-bit or 32-bit value in memory into the 80-bit registers counts as
a format conversion and an signaling NaN input will turn into a quiet NaN in
the register format.