optimization/6914: -O2 and -O give different results for the same valid FP code

[bangerth@dealii.org]

Synopsis: -O2 and -O give different results for the same valid FP code

State-Changed-From-To: open->closed
State-Changed-By: bangerth
State-Changed-When: Mon Dec  2 13:37:32 2002
State-Changed-Why:
    As mentioned in the audit trail, this is not a bug in gcc.
    If you think the documentation of glibc is insufficient,
    file a report for this library. However, I think the
    64 vs 80bit double horse is already quite dead from
    beating, so doing it again will not help much.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=6914