30  *    The macro "Fld" encodes a bit field, given its size and its shift value
36  *    field's mask is cumbersome and might break the assembler (255-character
40  *    Size      	Size of the bit field, in number of bits.
41  *    Shft      	Shift value of the bit field with respect to bit 0.
44  *    Fld       	Encoded bit field.
56  *    bit field.
59  *    Field     	Encoded bit field (using the macro "Fld").
62  *    FSize     	Size of the bit field, in number of bits.
63  *    FShft     	Shift value of the bit field with respect to bit 0.
64  *    FMsk      	Mask for the bit field.
65  *    FAlnMsk   	Mask for the bit field, aligned on bit 0.
66  *    F1stBit   	First bit of the bit field.
69 #define FSize(Field)	((Field) >> 16)  argument
70 #define FShft(Field)	((Field) & 0x0000FFFF)  argument
71 #define FMsk(Field)	(((UData (1) << FSize (Field)) - 1) << FShft (Field))  argument
72 #define FAlnMsk(Field)	((UData (1) << FSize (Field)) - 1)  argument
73 #define F1stBit(Field)	(UData (1) << FShft (Field))  argument
80  *    The macro "FInsrt" inserts a value into a bit field by shifting the
84  *    Value     	Bit-field value.
85  *    Field     	Encoded bit field (using the macro "Fld").
88  *    FInsrt    	Bit-field value positioned appropriately.
91 #define FInsrt(Value, Field) \  argument
92                 	(UData (Value) << FShft (Field))
99  *    The macro "FExtr" extracts the value of a bit field by masking and
103  *    Data      	Data containing the bit-field to be extracted.
104  *    Field     	Encoded bit field (using the macro "Fld").
107  *    FExtr     	Bit-field value.
110 #define FExtr(Data, Field) \  argument
111                 	((UData (Data) >> FShft (Field)) & FAlnMsk (Field))