Assembler Language Reference

stfd (Store Floating-Point Double) Instruction

Purpose

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

Syntax

Bits	Value
0-5	54
6-10	FRS
11-15	RA
16-31	D

stfd	FRS, D( RA)

Description

The stfd 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 GPR RA and D. The sum is a 16-bit signed two's complement integer sign-extended to 32 bits. If GPR RA is 0, then the EA is D.

The stfd 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.
D	Specifies a16-bit signed two's complement integer sign-extended to 32 bits for EA calculation.
RA	Specifies source general-purpose register for EA calculation.

Examples

The following code stores the contents of FPR 6 into a location in memory:

.csect data[rw]
buffer: .long 0,0
# Assume FPR 6 contains 0x4865 6C6C 6F20 776F.
# Assume GPR 4 contains the address of csect data[rw].
.csect text[pr]
stfd 6,buffer(4)
# buffer now contains 0x4865 6C6C 6F20 776F.