NEC uPD98502 Table 2-5. Load/Store Instruction (Extended ISA)

CHAPTER 2 VR4120A

70 Preliminary User’s Manual S15543EJ1V0UM

Table 2-5. Load/Store Instruction (Extended ISA)

Instruction Format and Description

Store Word Left SWL rt, offset (base)

The offset is sign extended and then added to the contents of the register base to form the virtual

address. Shifts to the right the contents of register rt so that the left-most byte of the word is in the

position of the address-specified byte. The result is stored to the lower word in memory.

Store Word Right SWR rt, offset (base)

The offset is sign extended and then added to the contents of the register base to form the virtual

address. Shifts to the left the contents of register rt so that the right-most byte of the word is in the

position of the address-specified byte. The result is stored to the upper word in memory.

Load Doubleword LD rt, offset (base)

The offset is sign extended and then added to the contents of the register base to form the virtual

address. The doubleword of the memory location specified by the address are loaded into register rt.

Load Doubleword Left LDL rt, offset (base)

The offset is sign extended and then added to the contents of the register base to form the virtual

address. Shifts to the left the double word whose address is specified so that the address-specified

byte is at the left-most position of the double word. The result of the shift operation is merged with the

contents of register rt and loaded to register rt.

Load Doubleword Right LDR rt, offset (base)

The offset is sign extended and then added to the contents of the register base to form the virtual

address. Shifts to the right the double word whose address is specified so that the address-specified

byte is at the right-most position of the double word. The result of the shift operation is merged with

the contents of register rt and loaded to register rt.

Load Word Unsigned LWU rt, offset (base)

The offset is sign extended and then added to the contents of the register base to form the virtual

address. The word of the memory location specified by the address are zero extended and loaded into

Store Doubleword SD rt, offset (base)

The offset is sign extended and then added to the contents of the register base to form the virtual

address. The contents of register rt are stored to the memory location specified by the address.

Store Doubleword Left SDL rt, offset (base)

The offset is sign extended and then added to the contents of the register base to form the virtual

address. Shifts to the right the contents of register rt so that the left-most byte of the double word is in

the position of the address-specified byte. The result is stored to the lower doubleword in memory.

Store Doubleword Right SDR rt, offset (base)

The offset is sign extended and then added to the contents of the register base to form the virtual

address. Shifts to the left the contents of register rt so that the right-most byte of the double word is in

the position of the address-specified byte. The result is stored to the upper doubleword in memory.

ase rt offset