IBM PPC440X5 Instrukcja Użytkownika Pobierz pdf (Strona 382)

100

101

mullw

Multiply Low Word

PPC440x5 CPU Core User’s Manual Preliminary

Page 382 of 589

instrset.fm.

September 12, 2002

mullw

Multiply Low Word

prod

0:63

← (RA) × (RB) signed

(RT)

← prod

32:63

The 64-bit signed product of register RA and register RB is formed. The least significant 32 bits of the result is

placed into register RT.

If the signed product cannot be represented in 32 bits and OE=1, XER[SO, OV] are set to 1.

Registers Altered

•RT

• CR[CR0] if Rc contains 1

• XER[SO, OV] if OE=1

Programming Note

The least significant 32 bits of the product are correct, regardless of whether register RA and register RB are

interpreted as signed or unsigned numbers. The overflow indication, however, is calculated specifically for a

64-bit signed product, and is dependent upon interpretation of the source operands as signed numbers.

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

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

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

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

31 RT RA RB OE 235 Rc

0 6 11 16 21 22 31

1 2 ... 377 378 379 380 381 382 383 384 385 386 387 ... 589 590

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