optimization/10258: byteswapping code fails in -O2

[bangerth@dealii.org]

Synopsis: byteswapping code fails in -O2

State-Changed-From-To: open->feedback
State-Changed-By: bangerth
State-Changed-When: Fri Mar 28 22:14:41 2003
State-Changed-Why:
    Does the result change if you add to -O2 the flag
    -fno-strict-aliasing? You might want to review the section
    on this flag in the manual? -fstrict-aliasing is switched on
    by -O2.
    
    W.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10258