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 |
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
| Item | Description |
|---|---|
| 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.