Stores a doubleword of data in a specified location in memory.
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.
|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.|
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.
Floating-Point Load and Store Instructions.