weird optimization in sin+cos, x86 backend

[Andrew Haley]

On 02/15/2012 09:30 AM, Vincent Lefevre wrote:
>> But to be absolutely clear, glibc's libm doesn't have a problem
>> > meeting C99, AFAIK.
> That's not quite correct. It is completely broken in directed
> rounding modes (up to crashes).

Eh?  C99 doesn't require directed rounding modes.  I'll grant you,
if they are provided they shouldn't crash.  :-)

Andrew.