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Altera Corporation 61
3232323232-Bit Instruction Set
2
32-Bit Instruction
Set
LDS
Load 32-bit Data From Memory (Stack Addressing Mode)
Operation:
RA ← Mem32[align32(%sp + (IMM8 × 4))]
Assembler Syntax: LDS %rA,[%sp,IMM8]
Example: LDS %o1,[%sp,3] ; load %o1 from stack + 12
; second register can only be %sp
Description: Loads a 32-bit data value from memory into RA. Data is always read from 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. LDS 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 of operand RA
IMM8 = 8-bit immediate value
1514131211109876543210
1 1 1 IMM8 A
NVZC
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