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AIX Version 4.3 Assembler Language Reference

cmpi (Compare Immediate) Instruction


Compares the contents of a general-purpose register and a given value algebraically.


cmpi BF,L,RA,SI

See "Extended Mnemonics of Fixed-Point Compare Instructions" for more information.


The cmpi instruction compares the contents of general-purpose register (GPR) RA and a 16- bit signed integer, SI, as signed integers and sets one of the bits in Condition Register Field BF.

BF can be Condition Register Field 0-7; programmers can specify which Condition Register Field will indicate the result of the operation.

The bits of Condition Register Field BF are interpreted as follows:

Bit Name Description
0 LT (RA) < SI
1 GT (RA) > SI
2 EQ (RA) = SI

The cmpi instruction has one syntax form and does not affect the Fixed-Point Exception Register. Condition Register Field 0 is unaffected unless it is specified as BF by the programmer.


BF Specifies Condition Register Field 0-7 which indicates result of compare.
L Must be set to 0 for the 32-bit subset architecture.
RA Specifies first source general-purpose register for operation.
SI Specifies 16-bit signed integer for operation.


The following code compares the contents of GPR 4 and the signed integer 0x11 and sets Condition Register Field 0 to reflect the result of the operation:

# Assume GPR 4 contains 0xFFFF FFE7.
cmpi 0,4,0x11
# The LT bit of Condition Register Field 0 is set. 

Related Information

The cmp (Compare) instruction, cmpl (Compare Logical) instruction, cmpli (Compare Logical Immediate) instruction.

Fixed-Point Processor.

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