VR4102 datasheet(85/701 Pages) NEC

85 / 701 page

CHAPTER 3 CPU INSTRUCTION SET SUMMARY

Table 3-3. Load/store Instruction (Extended ISA)

Instruction

Format and Description

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

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 register rt

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.

base

offset

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