optimization/7719: gcc with -O2 generates wrong code

[ebotcazou@gcc.gnu.org]

Synopsis: gcc with -O2 generates wrong code

State-Changed-From-To: open->feedback
State-Changed-By: ebotcazou
State-Changed-When: Wed Feb 19 08:35:13 2003
State-Changed-Why:
    Probably not a bug. On x86, at -O2, floating point values
    may be kept in FP registers when doing comparison with
    others stored in memory. Now x86 FP registers have
    extra-precision over a 'double', which may invalid
    an equality comparison. Compile your code with '-ffloat-store'
    if it relies on exact IEEE floating-point semantics.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7719