Split-field notation

The instruction field in some cases occupies more than one contiguous sequence of bits that are used in permuted order. Such a field is called a split field.

In some cases an instruction field occupies more than one contiguous sequence of bits, or occupies a contiguous sequence of bits that are used in permuted order. Such a field is called a split field. In the previous figures and in the syntax for individual instructions, the name of a split field is shown in lowercase letters, once for each of the contiguous bit sequences. In the description of an instruction with a split field, and in certain other places where the individual bits of a split field are identified, the name of the field in lowercase letters represents the concatenation of the sequences from left to right. In all other cases, the name of the field is capitalized and represents the concatenation of the sequences in some order, which does not have to be left to right. The order is described for each affected instruction.