Stores a word of data from a general-purpose register into a specified location in memory.
The stw and st instructions store a word from general-purpose register (GPR) RS into a word of storage addressed by the effective address (EA).
If 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 stw and st instructions have one syntax form and do not affect the Fixed-Point Exception Register or Condition Register Field 0.
|RS||Specifies source general-purpose 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 GPR 6 into a location in memory:
.csect data[rw] buffer: .long 0,0 # Assume GPR 6 contains 0x9000 3000. # Assume GPR 5 contains the address of buffer. .csect text[pr] stw 6,4(5) # 0x9000 3000 is now stored at the address buffer+4.
Fixed-Point Load and Store Instructions.