IBM PPC440X5 Manual do Utilizador descarregar pdf (Página 262)

100

101

addme

Add to Minus One Extended

PPC440x5 CPU Core User’s Manual Preliminary

Page 262 of 589

instrset.fm.

September 12, 2002

addme

Add to Minus One Extended

(RT) ← (RA) + XER[CA] + (–1)

if (RA) + XER[CA] + 0xFFFF FFFF 2

– 1 then

XER[CA]

← 1

else

XER[CA]

← 0

The sum of the contents of register RA, XER[CA], and –1 is placed into register RT.

XER[CA] is set to a value determined by the unsigned magnitude of the result of the add operation.

Registers Altered

•RT

• XER[CA]

• CR[CR0] if Rc contains 1

• XER[SO, OV] if OE contains 1

Invalid Instruction Forms

• Reserved ﬁelds

addme RT, RA OE= 0, Rc= 0

addme. RT, RA OE= 0, Rc=1

addmeo RT, RA OE=1, Rc= 0

addmeo. RT, RA OE =1, Rc=1

31 RT RA OE 234 Rc

0 6 11 16 21 22 31

1 2 ... 257 258 259 260 261 262 263 264 265 266 267 ... 589 590

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