Assembler Language Reference

lwa (Load Word Algebraic) Instruction

Purpose

Load a fullword of data from storage into the low-order 32 bits of the specified general purpose register. Sign extend the data into the high-order 32 bits of the register.

Syntax

Bits	Value
0-5	58
6-10	D
11-15	A
16-29	ds
30-31	10

POWER family
lwa	RT, D (RA)

Description

The fullword in storage located at the effective address (EA) is loaded into the low-order 32 bits of the target general purpose register (GRP) RT. The value is then sign-extended to fill the high-order 32 bits of the register.

If GRP RA is not 0, the EA is the sum of the contents of GRP RA and B; otherwise, the EA is equal to the contents of RB.

Parameters

RT	Specifies target general-purpose register where result of the operation is stored.
D	Specifies a 16-bit, signed two's complement integer sign-extended to 32 bits for EA calculation.
RA	Specifies source general-purpose register for EA calculation.

Implementation

This instruction is defined only for 64-bit implementations. Using it on a 32-bit implementation will cause the system illegal instruction error handler to be invoked.