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Assembler Language Reference

lwax (Load Word Algebraic Indexed) 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 31
6-10 D
11-15 A
16-20 B
21-30 341
31 0
POWER family
lwax RT, RA, RB

Description

The fullword in storage located at the effective address (EA) is loaded into the low-order 32 bits of the target general puspose register (GRP). 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 operation is stored.
RA Specifies source general-purpose register for EA calculation.
RB 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.

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