Appendix A
A-8 MIPS R4000 Microprocessor User's Manual
As shown in Table A-3, the Access Type field indicates the size of the data
item to be loaded or stored. Regardless of access type or byte-numbering
order (endianness), the address specifies the byte which has the smallest
byte address in the addressed field. For a big-endian machine, this is the
leftmost byte and contains the sign for a 2’s complement number; for a
little-endian machine, this is the rightmost byte.
Table A-3 Access Type Specifications for Loads/Stores
The bytes within the addressed doubleword which are used can be
determined directly from the access type and the three low-order bits of
the address.
Access Type Mnemonic Value Meaning
DOUBLEWORD 7 8 bytes (64 bits)
SEPTIBYTE 6 7 bytes (56 bits)
SEXTIBYTE 5 6 bytes (48 bits)
QUINTIBYTE 4 5 bytes (40 bits)
WORD 3 4 bytes (32 bits)
TRIPLEBYTE 2 3 bytes (24 bits)
HALFWORD 1 2 bytes (16 bits)
BYTE 0 1 byte (8 bits)
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