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46 Altera Corporation
32-Bit Instruction Set
CMPI
Compare Immediate
Operation: ∅←RA–(0x00.00:K:IMM5)
Assembler Syntax: CMPI & %rA,IMM5
Example: Not preceded by PFX:
CMPI %i3,24 ; compare %i3 to 24
Preceded by PFX:
PFX %hi(1000)
CMPI %i4,%lo(1000)
Description: Not preceded by PFX:
Subtract a 5-bit immediate value given by IMM5 from RA, and discard the result.
Set the condition codes according to the subtraction. RA is not altered.
Preceded by PFX:
The Immediate operand is extended from 5 to 16 bits by concatenating the
contents of the K-register (11 bits) with IMM5 (5 bits). The 16-bit immediate value
(K : IMM5) is zero-extended to 32 bits and subtracted from RA. Condition codes
are set and the result is discarded. RA is not altered.
Condition Codes: Flags:
N: Result bit 31
V: Signed-arithmetic overflow
Z: Set if result is zero; cleared otherwise
C: Set if there was a borrow from the subtraction; cleared otherwise
Instruction Format: Ri5
Instruction Fields: A = Register index of RA operand
IMM5 = 5-bit immediate value
1514131211109876543210
000101 IMM5 A
NVZC
∆∆∆∆