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AIX Version 4.3 Assembler Language Reference

addi (Add Immediate) or cal (Compute Address Lower) Instruction

Purpose

Calculates an address from an offset and a base address and places the result in a general-purpose register.

Syntax

PowerPC
addi RT,RA,SI
POWER
cal RT,D(RA)

See "Extended Mnemonics of Fixed-Point Arithmetic Instructions" and "Extended Mnemonics of Fixed-Point Load Instructions" for more information.

Description

The addi and cal instructions place the sum of the contents of general-purpose register (GPR) RA and the 16-bit two's complement integer SI or D, sign-extended to 32 bits, into the target GPR RT. If GPR RA is GPR 0, then SI or D is stored into the target GPR RT.

The addi and cal instructions have one syntax form and do not affect Condition Register Field 0 or the Fixed-Point Exception Register.

Parameters

RT Specifies target general-purpose register where result of operation is stored.
RA Specifies source general-purpose register for operation.
D Specifies 16-bit two's complement integer sign extended to 32 bits.
SI Specifies 16-bit signed integer for operation.

Examples

The following code calculates an address or contents with an offset of 0xFFFF 8FF0 from the contents of GPR 5 and stores the result in GPR 4:

# Assume GPR 5 contains 0x0000 0900.
addi 4,0xFFFF8FF0(5)
# GPR 4 now contains 0xFFFF 98F0.

Related Information

Fixed-Point Processor.

Fixed-Point Address Computation Instructions.

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