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AIX Version 4.3 Assembler Language Reference

stfs (Store Floating-Point Single) Instruction


Stores a word of data from a floating-point register into a specified location in memory.


stfs FRS,D(RA)


The stfs instruction converts the contents of floating-point register (FPR) FRS to single-precision and stores the result into the word of 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, a 16-bit signed two's complement integer sign-extended to 32 bits. If GPR RA is 0, then the EA is D.

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


FRS Specifies floating-point register of stored data.
D Specifies a 16-bit, signed two's complement integer sign-extended to 32 bits for EA calculation.
RA Specifies source general-purpose register for EA calculation.


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

.csect data[rw]
buffer: .long 0
# Assume FPR 6 contains 0x4865 6C6C 6F20 776F.
# Assume GPR 4 contains the address of csect data[rw].
.csect text[pr]
stfs 6,buffer(4)
# buffer now contains 0x432B 6363.

Related Information

Floating-Point Processor.

Floating-Point Load and Store Instructions.

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