[Haskell-cafe] Maybe a compiler bug?

When using any of -O, -O1, -O2 with the Debian binary build of GHC 6.6, trace shows that the expression if (lr > ll) then False else True is (at least partially) evaluated, but the value returned is always True, even though trace reports that (lr > ll) is True. When I use only the native code generator (without optimization), the correct value (False) is returned. Further detail and complete code on request. Best, Murray Gross