e15b580b89
gcc is bad at folding shifts into ands (and probably other ops) with simple constants (it prefers using immediates, saving a register and reducing loop header). help it fold shifts into the ors (non-constant, so gcc cannot pick the immediate version) instead. git-svn-id: https://gambatte.svn.sourceforge.net/svnroot/gambatte@330 9dfb2916-2d38-0410-aef4-c5fe6c9ffc24