IBM PPC440X5 Manual do Utilizador descarregar pdf (Página 377)

100

101

mulhw

Multiply High Word

Preliminary PPC440x5 CPU Core User’s Manual

instrset.fm.

September 12, 2002 Page 377 of 589

mulhw

Multiply High Word

prod

0:63

← (RA) × (RB) signed

(RT)

← prod

0:31

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

placed into register RT.

Registers Altered

•RT

• CR[CR0] if Rc contains 1

Programming Note

The most significant 32 bits of the product, unlike the least significant 32 bits, may differ depending on

whether the registers RA and RB are interpreted as signed or unsigned quantities. mulhw generates the

correct result when these operands are interpreted as signed quantities. mulhwu generates the correct

result when these operands are interpreted as unsigned quantities.

Invalid Instruction Forms

• Reserved ﬁelds

mulhw RT, RA, RB Rc=0

mulhw. RT, RA, RB Rc=1

31 RT RA RB 75 Rc

0 6 11 16 21 22 31

1 2 ... 372 373 374 375 376 377 378 379 380 381 382 ... 589 590

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