Assembler Language Reference

sthx (Store Half Indexed) Instruction

Purpose

Stores a halfword of data from a general-purpose register into a specified location in memory.

Syntax

Bits	Value
0-5	31
6-10	RS
11-15	RA
16-20	RB
21-30	407
31	/

sthx	RS, RA, RB

Description

The sthx instruction stores bits 16-31 of general-purpose register (GPR) RS into the halfword of storage addressed by the effective address (EA).

If GPR RA is not 0, the EA is the sum of the contents of GPR RA and GPR RB. If GPR RA is 0, then the EA is the contents of GPR RB.

The sthx instruction has one syntax form and does not affect the Fixed-Point Exception Register or Condition Register Field 0.

Parameters

RS	Specifies source general-purpose register of stored data.
RA	Specifies source general-purpose register for EA calculation.
RB	Specifies source general-purpose register for EA calculation.

Examples

The following code stores halfword contents of GPR 6 into a location in memory:

.csect data[rw]
buffer: .long 0
# Assume GPR 6 contains 0x9000 3456.
# Assume GPR 5 contains the address of buffer.
.csect text[pr]
sthx 6,0,5
# buffer now contains 0x3456.

Related Information

Fixed-Point Processor .

Fixed-Point Load and Store Instructions .