Constant dr_mcontext_flags_t_DR_MC_MULTIMEDIA 

pub const dr_mcontext_flags_t_DR_MC_MULTIMEDIA: dr_mcontext_flags_t = 4;

Selects the simd fields. This flag is ignored unless dr_mcontext_xmm_fields_valid() returns true. If dr_mcontext_xmm_fields_valid() returns false, the application values of the multimedia registers remain in the registers themselves.