IBM PPC440X5 Manuel d'utilisateur télécharger pdf (Page 405)

100

101

slw

Shift Left Word

Preliminary PPC440x5 CPU Core User’s Manual

instrset.fm.

September 12, 2002 Page 405 of 589

slw

Shift Left Word

n ← (RB)

26:31

r ← ROTL((RS), n)

if n < 32 then

← MASK(0, 31 – n)

else

←

(RA)

← r ∧ m

The contents of register RS are shifted left by the number of bits specified by the contents of register RB

26:31

Bits shifted left out of the most significant bit are lost, and 0-bits fill vacated bit positions on the right. The

result is placed into register RA.

Note that if RB

= 1, then the shift amount is 32 bits or more, and thus all bits are shifted out such that

Registers Altered

•RA

• CR[CR0] if Rc contains 1

slw RA, RS, RB Rc=0

slw. RA, RS, RB Rc=1

31 RS RA RB 24 Rc

0 6 11 16 21 31

1 2 ... 400 401 402 403 404 405 406 407 408 409 410 ... 589 590

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IBM PPC440X5 Manuel d'utilisateur Page 405

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