FPU Flags Affected

┌──┬──┬──┬──┐
│C0│C1│C2│C3│
├──┼──┼──┼──┤
│? │* │? │? │
└──┴──┴──┴──┘

C1 as described in FPU Flags Affected; C0, C2, C3 undefined.