Encoding:

Format:

SWC1 ft, offset(base)

Purpose:

Store Word from Floating Point

To store a word from an FPR to memory.

Description:

 memory[GPR[base] + offset] = FPR[ft]

The low 32-bit word from FPR ft is stored in memory at the location specified by the aligned effective address. The

16-bit signed offset is added to the contents of GPR base to form the effective address.

Restrictions:

Pre-Release 6: An Address Error exception occurs if EffectiveAddress_1..0 != 0 (not word-aligned).

Release 6 allows hardware to provide address misalignment support in lieu of requiring natural alignment.

Note: The pseudocode is not completely adapted for Release 6 misalignment support as the handling is implementation dependent.

Operation:

vAddr = sign_extend(offset) + GPR[base]
(pAddr, CCA) = AddressTranslation(vAddr, DATA, STORE)
pAddr = pAddrPSIZE-1..3 || (pAddr2..0 xor (ReverseEndian || 02))
bytesel = vAddr2..0 xor (BigEndianCPU || 02)
datadoubleword = ValueFPR(ft, UNINTERPRETED_WORD) || 08*bytesel
StoreMemory(CCA, WORD, datadoubleword, pAddr, vAddr, DATA)

Exceptions:

Coprocessor Unusable, Reserved Instruction, TLB Refill, TLB Invalid, TLB Modified, Address Error, Watch