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AIX Version 4.3 Assembler Language Reference

sld (Shift Left Double Word) Instruction


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


sld RA, RS, RB (OE=0 Rc=0)
sld. RA, RS, RB (OE=0 Rc=1)


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:


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.


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.

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