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From MSB to LSB: @multitable {Bit offset} {@code{fre_cfa_base_reg_id}} {Size of stack offsets in bytes. Valid values} @headitem Bit offset @tab Name @tab Description @item 7 -@tab @code{unused} -@tab Unused bit. +@tab @code{fre_mangled_ra_p} +@tab Indicate whether the return address is mangled with any authorization bits (signed RA). @item 5-6 @tab @code{fre_offset_size}