sld (Shift Left Double Word) instruction

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Purpose

Shift the contents of a general purpose register left by the number of bits specified by the contents of another general purpose register.

Syntax

Bits Value
0 - 5 31
6 - 10 S
11 - 15 A
16 -20 B
21 - 30 27
31 Rc
POWER® family
sld RA, RS, RB (OE=0 Rc=0)
sld. RA, RS, RB (OE=0 Rc=1)

Description

The contents of general purpose register (GPR) RS are shifted left the number of bits specified by the low-order seven bits of GPR RB. Bits shifted out of position 0 are lost. Zeros are supplied to the vacated positions on the right. The result is placed into GPR RA. Shift amounts from 64 to 127 give a zero result.

Other registers altered:

  • Condition Register (CR0 field):

    Affected: LT, GT, EQ, SO (if Rc = 1)

Parameters

Item Description
RA Specifies target general-purpose register for the result of the operation.
RS Specifies source general-purpose register containing the operand for thr shift operation.
RB The low-order seven bits specify the distance to shift the operand.

Implementation

This instruction is defined only for 64-bit implementations. Using it on a 32-bit implementation will cause the system illegal instruction error handler to be invoked.