0100nnnn01010010
sr ← ZeroExtend32(SR);
fpul ← SignExtend32(FPUL);
op1 ← SignExtend32(Rn);
IF (FpuIsDisabled(sr) AND IsDelaySlot())
THROW SLOTFPUDIS;
IF (FpuIsDisabled(sr))
THROW FPUDIS;
address ← ZeroExtend32(op1 - 4);
WriteMemory32(address, fpul);
op1 ← address;
Rn ← Register(op1);