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9-12 PPC405 Core User’s Manual
addis
Add Immediate Shifted
addis
Add Immediate Shifted
(RT) ← (RA|0) + (IM ||
16
0)
If the RA field is 0, the IM field is concatenated on its right with sixteen 0-bits and placed into register
RT.
If the RA field is nonzero, the contents of register RA are added to the contents of the extended IM
field. The sum is stored into register RT.
Registers Altered
•RT
Programming Note
An addi instruction stores a sign-extended 16-bit value in a GPR. An addis instruction followed by an
ori instruction stores an arbitrary 32-bit value in a GPR, as shown in the following example:
addis RT, 0, high 16 bits of value
ori RT, RT, low 16 bits of value
Architecture Note
This instruction is part of the PowerPC User Instruction Set Architecture.
addis RT, RA, IM
15 RT RA IM
0 6 11 16 31
Table 9-6. Extended Mnemonics for addis
Mnemonic Operands Function
Other Registers
Altered
lis
RT, IM Load immediate shifted.
(RT)
← (IM ||
16
0)
Extended mnemonic for
addis RT,0,IM
subis
RT, RA, IM Subtract (IM
||
16
0) from (RA|0).
Place result in RT.
Extended mnemonic for
addis RT,RA,−IM