IBM PPC440X5 Manuel d'utilisateur télécharger pdf (Page 345)

100

101

macchw

Multiply Accumulate Cross Halfword to Word Modulo Signed

Preliminary PPC440x5 CPU Core User’s Manual

instrset.fm.

September 12, 2002 Page 345 of 589

macchw

Multiply Accumulate Cross Halfword to Word Modulo Signed

prod

0:31

← (RA)

16:31

× (RB)

0:15

signed

temp

0:32

← prod

0:31

+ (RT)

(RT)

← temp

1:32

The low-order halfword of RA is multiplied by the high-order halfword of RB. The signed product is summed

with the contents of RT and RT is updated with the low-order 32 bits of the signed sum.

Registers Altered

•RT

• CR[CR0] if Rc contains 1

• XER[SO, OV] if OE contains 1

Architecture Note

This instruction is implementation-specific and programs which use this instruction may not be portable to

other PowerPC Book-E implementations. See Instruction Set Portability on page 250.

macchw RT, RA, RB OE=0, Rc=0

macchw. RT, RA, RB OE=0, Rc=1

macchwo RT, RA, RB OE=1, Rc=0

macchwo. RT, RA, RB OE=1, Rc=1

4 RT RA RB OE 172 Rc

0 6 11 16 21 22 31

1 2 ... 340 341 342 343 344 345 346 347 348 349 350 ... 589 590

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IBM PPC440X5 Manuel d'utilisateur Page 345

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