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OpenBoot 3.x Command Reference Manual

Bit-wise Logical Operators

Table I-10 Bit-wise Logical Operators

Command 

Stack Diagram 

Description 
2*

( x1 -- x2 ) 

Multiply by 2. 
2/

( x1 -- x2 ) 

Divide by 2. 
>>a

( x1 u -- x2 ) 

Arithmetic right-shift x1 by u bits.
and

( x1 x2 -- x3 ) 

Bitwise logical AND. 
invert

( x1 -- x2 ) 

Invert all bits of x1.
lshift

( x1 u -- x2 ) 

Left-shift x1 by u bits. Zero-fill low bits.
or

( x1 x2 -- x3 ) 

Bitwise logical OR. 
rshift

( x1 u -- x2 ) 

Right-shift x1 by u bits. Zero-fill high bits.
u2/

( x1 -- x2 ) 

Logical right shift 1 bit; zero shifted into high bit. 
xor

( x1 x2 -- x3 ) 

Bitwise exclusive OR.