Excalibur electronic A-MNL-NIOSPROG-01.1 manual Compare Immediate, Cmpi & %rA,IMM5

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

V

Z

C

∆

∆

∆

∆

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

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

0

0

0

1

0

1

IMM5

A

46 Altera Corporation