IBM PPC440X5 Uživatelský manuál stáhnout pdf (Strana 353)

100

101

maclhw

Multiply Accumulate Low Halfword to Word Modulo Signed

Preliminary PPC440x5 CPU Core User’s Manual

instrset.fm.

September 12, 2002 Page 353 of 589

maclhw

Multiply Accumulate Low Halfword to Word Modulo Signed

prod

0:31

← (RA)

16:31

× (RB)

16:31

signed

temp

0:32

← prod

0:31

+ (RT)

(RT)

← temp

1:32

The low-order halfword of RA is multiplied by the low-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.

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

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

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

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

4 RT RA RB OE 428 Rc

0 6 11 16 21 22 31

1 2 ... 348 349 350 351 352 353 354 355 356 357 358 ... 589 590

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