stfs
Store Floating-Point Single - D0 00 00 00
stfs
Instruction Syntax
| Mnemonic | Format | Flags |
| stfs | frS,d(rA) | None |
Instruction Encoding
1
1
0
1
0
0
S
S
S
S
S
A
A
A
A
A
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
| Field | Bits | Description |
| Primary Opcode | 0-5 | 110100 (0x34) |
| frS | 6-10 | Source floating-point register |
| rA | 11-15 | Base register |
| SIMM | 16-31 | Signed immediate offset |
Operation
EA ← (rA) + SIMM (EA) ← (frS)[32:63]
The effective address is calculated by adding the signed immediate offset to the base register. The single-precision floating-point value (high-order 32 bits) of the source register is stored at the effective address.
Note: The stfs instruction stores a 32-bit single-precision floating-point value to memory. The address must be aligned to a 4-byte boundary.
Affected Registers
Memory
- Single-precision floating-point value at effective address (EA)
Examples
Basic Store Floating-Point Single
# Store single-precision value from fr1 to memory stfs fr1, 0(r3) # Store at address in r3 stfs fr1, 4(r3) # Store at address r3 + 4
Array of Singles
# Store single in array li r4, 0 # Array index slwi r4, r4, 2 # Multiply by 4 (single size) add r5, r3, r4 # Calculate address stfs fr1, 0(r5) # Store single
Floating-Point Calculations
# Store result of floating-point calculation fadds fr2, fr0, fr1 # fr2 = fr0 + fr1 (single precision) stfs fr2, result # Store result to memory