IBM PPC440X5 Manual do Utilizador descarregar pdf (Página 268)

100

101

Branch

PPC440x5 CPU Core User’s Manual Preliminary

Page 268 of 589

instrset.fm.

September 12, 2002

Branch

If AA = 1 then

← target

6:29

NIA ← EXTS(LI ||

else

← (target – CIA)

6:29

NIA ← CIA + EXTS(LI ||

if LK = 1 then

(LR)

← CIA + 4

← NIA

The next instruction address (NIA) is the effective address of the branch target. The NIA is formed by adding

a displacement to a base address. The displacement is obtained by concatenating two 0-bits to the right of

the LI field and sign-extending the result to 32 bits.

If the AA field contains 0, the base address is the address of the branch instruction, which is the current

instruction address (CIA). If the AA field contains 1, the base address is 0.

Instruction execution resumes with the instruction at the NIA.

If the LK field contains 1, then (CIA + 4) is placed into the LR.

Registers Altered

• LR if LK contains 1

b target AA=0, LK=0

ba target AA=1, LK=0

bl target AA=0, LK=1

bla target AA=1, LK=1

18 LI AA LK

06 30 31

1 2 ... 263 264 265 266 267 268 269 270 271 272 273 ... 589 590

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