Appendix A
A-4 MIPS R4000 Microprocessor User's Manual
A.3 Instruction Notation Conventions
In this appendix, all variable subfields in an instruction format (such as rs,
rt, immediate, etc.) are shown in lowercase names.
For the sake of clarity, we sometimes use an alias for a variable subfield in
the formats of specific instructions. For example, we use rs = base in the
format for load and store instructions. Such an alias is always lower case,
since it refers to a variable subfield.
Figures with the actual bit encoding for all the mnemonics are located at
the end of this Appendix, and the bit encoding also accompanies each
instruction.
In the instruction descriptions that follow, the Operation section describes
the operation performed by each instruction using a high-level language
notation. The R4000 can operate as either a 32- or 64-bit microprocessor
and the operation for both modes is included with the instruction
description.
Special symbols used in the notation are described in Table A-1.
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