Daniel, should this report be closed? Daniel Jacobowitz writes: > On Fri, Jan 10, 2003 at 11:58:33AM +0100, Gerhard Wesp wrote: > > > Do you get the expected results if you do this? > > > > Yes and no. > > > > I include a modified example. > > > > The assertion fails if compiled with -O3 -ffloat-store -DA, it doesn't > > if compiled without the -DA. So it seems to depend on where the > > assignments take place. > > > #if defined( A ) > > double ku ; > > double kx ; > > assert( ( ku = 2.5 * u ) >= ( kx = 2.5 * x ) ) ; // fails. > > #else > > double ku = 2.5 * x ; > > double kx = 2.5 * u ; > > assert( ku >= kx ) ; // doesn't fail. > > #endif > > Yup, that's C for you. The former uses the value of 2.5*u, the latter > uses the value of ku. You can see how this works by declaring ku > volatile and looking at the assembly; it'll be reloaded in the second > case but not the first.
