stdux (Store Double Word with Update Indexed) instruction
Purpose
Store a doubleword of data from a general purpose register into a specified memory location. Update the address base.
Syntax
| Bits | Value |
|---|---|
| 0 - 5 | 31 |
| 6 - 10 | S |
| 11 - 15 | A |
| 16 - 20 | B |
| 21 - 30 | 181 |
| 31 | 0 |
Description
The stdux instruction stores a doubleword in storage from the source general-purpose register (GPR) RS into the location in storage specified by the effective address (EA).
The EA is the sum of the contents of GPR RA and RB. GRP RA is updated with the EA.
If rA = 0, the instruction form is invalid.
Parameters
| Item | Description |
|---|---|
| RS | Specifies the source general-purpose register containing data. |
| 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.