gcc bug/quirk with left shifts on i386 family.

[Alexandre Oliva]

On Jan  4, 2001, Peter Wemm <peter@netplex.com.au> wrote:

> I'm not sure if this is a real bug or one of those gray 'implementation
> defined' areas of the language

It's actually undefined behavior, which allows the compiler to choose
whatever it wants, even if it's not self-consistent in different
occurrences of the same expression.  It could also format your hard
disk or start nethack.  Or it could arrange for the resulting program
to do so :-)

If it were implementation-defined, behavior would have to be
consistent.

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
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