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96 Altera Corporation
32-Bit Instruction Set
STS
Store 32-bit Data To Memory (Stack Addressing Mode)
Operation:
Mem32[align32(%sp + (IMM8 × 4))] ← RA
Assembler Syntax: STS [%sp,IMM8],%rA
Example: STS [%sp,17],%i5 ; store %i5 at stack + 68
; first register can only be %sp
Description: Stores the 32-bit value in RA to memory. Data is always written to a word-aligned
address given by bits 31..2 of %sp (the two LSBs of %sp are ignored) plus an 8-
bit, unsigned, word-scaled offset given by IMM8.
Conventionally, software uses %o6 (aka %sp) as a stack-pointer. STS allows
single-instruction access to any data word at a known offset in a 1Kbyte range
above %sp.
Condition Codes: Flags: Unaffected
Instruction Format: Ri8
Instruction Fields: A = Register index for operand RA
IMM8 = 8-bit immediate value
1514131211109876543210
1 1 0 IMM8 A
NVZC
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