Assembler Language Reference

stfdx (Store Floating-Point Double Indexed) Instruction

Purpose

Stores a doubleword of data in a specified location in memory.

Syntax

Bits	Value
0-5	31
6-10	FRS
11-15	RA
16-20	RB
21-30	727
31	/

stfdx

FRS, RA, RB

Description

The stfdx instruction stores the contents of floating-point register (FPR) FRS into the doubleword storage addressed by the effective address (EA).

If general-purpose register (GPR) RA is not 0, the EA is the sum of the contents of GPRs RA and RB. If GPR RA is 0, then the EA is the contents of GPR RB.

The stfdx instruction has one syntax form and does not affect the Floating-Point Status and Control Register or Condition Register Field 0.

Parameters

FRS	Specifies source floating-point 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 the contents of FPR 6 into a location in memory addressed by GPR 5 and GPR 4:

.csect data[rw]
buffer: .long 0,0,0,0
# Assume FPR 6 contains 0x4865 6C6C 6F20 776F.
# Assume GPR 4 contains 0x0000 0008.
# Assume GPR 5 contains the address of buffer.
.csect text[pr]
stfdx 6,4,5
# 0x4865 6C6C 6F20 776F is now stored at the
# address buffer+8.

Related Information

Floating-Point Processor .

Floating-Point Load and Store Instructions .