IBM PPC440X5 Bedienungsanleitung PDF herunterladen (Seite 385)

100

101

nmacchw

Negative Multiply Accumulate Cross Halfword to Word Modulo Signed

Preliminary PPC440x5 CPU Core User’s Manual

instrset.fm.

September 12, 2002 Page 385 of 589

nmacchw

Negative Multiply Accumulate Cross Halfword to Word Modulo Signed

nprod

0:31

← –((RA)

16:31

× (RB)

0:15

) signed

temp

0:32

← nprod

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 subtracted

from the contents of RT and RT is updated with the low-order 32 bits of the result.

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.

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

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

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

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

4 RT RA RB OE 174 Rc

0 6 11 16 21 22 31

1 2 ... 380 381 382 383 384 385 386 387 388 389 390 ... 589 590

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